edwards_1991 ============ H\. G\. M\. Edwards, D\. A\. Long and G\. Sherwood, "Line widths in the pure rotational Raman spectra of hydrogen and deuterium self\-broadened and broadened by foreign gases", J\. Raman Spectrosc\. 22, 607 \(1991\) `Source record `__ · :doc:`Catalogue ` · :doc:`Review register ` DOI: `10\.1002/jrs\.1250221103 `__ **Source kind:** measurement **Recorded technique:** Spontaneous pure rotational Raman spectroscopy \(apparatus and data handling as in the authors' earlier papers, Refs\. 1 and 3, p\. 1\); spectra calibrated against a thorium hollow\-cathode lamp; each line's width measured five times per pressure and the full width at half maximum found with a curve\-analysis program \(CAP, Ref\. 1\); the broadening coefficient sigma from the averaged widths against pressure \(p\. 2\)\. Self broadening\: 1H2 at 1\-100 bar, 2H2 at 1\-60 bar, 90\-375 K; foreign broadening\: 1 bar of the host with He, Ar, O2, N2, CO or HCl to 2\-100 bar total \(HCl to 40 bar\), 293 K; 2H2 S0\(0\) with N2 and CO at 100\-293 K\. Gases from the British Oxygen Company, 99\.9 %\. **Materials in structured entries:** D2, H2 **Dataset quantities:** raman\_linewidth **Contents:** 29 datasets; 0 formulas. Curation notes -------------- Identity checked against the first page\. Page numbers are pdf pages \(1\-5 = journal pp\. 607\-611\)\. Materials\: 1H2 is H2 and 2H2 is D2, both as supplied \(normal\: ortho\:para not altered; the paper says nothing about conversion at 90 K\)\. HD is not measured here \(Refs\. 9, 10 studied it\)\. WIDTH CONVENTION\. p\. 2\: 'Line\-width measurements on each rotational line were repeated five times for each pressure\. The full width at half maximum intensity \(FWHM\) was then obtained using a curve analysis program \(CAP\) described previously\. The average of each set of linewidth measurements was used in the calculation of the broadening coefficients\.' The broadening coefficients 'sigma cm\-1 bar\-1' \(p\. 2\) are therefore taken as FWHM per bar \(the paper never writes the law Delta nu = sigma p explicitly\)\. Per bar of pressure at the stated temperature \(not per amagat\)\. Dicke narrowing\: 'In the pressure region 1\-10 bar at 293 K, a narrowing of line width \(Dicke narrowing\) with increase in pressure was observed' \(p\. 2; Fig\. 1\), and at 5\-15 bar in the foreign\-gas runs \(p\. 3, Fig\. 3\); no Dicke term is given, and the pressure range over which sigma was fitted is not stated\. Uncertainties\: the \+\- are not described \(level not stated\)\. FOREIGN GASES\. 'In all the measurements of foreign gas broadening, the partial pressure of the host gas was 1 bar over a total pressure range of 2\-100 bar' \(p\. 2\)\: sigma is per bar of the total pressure, including the host's 1 bar \(not corrected for self\-broadening, as far as the paper says\)\. HCl \(not a curated material\) as printed, 10^3 sigma\: 1H2 S0\(0\) 27\.6 \+\- 1\.4, S0\(1\) 32\.7 \+\- 1\.8, S0\(2\) 11\.7 \+\- 0\.9 \(Table 4, the row label extracted as 'HCI'\); 2H2 S0\(0\)\-S0\(4\) 136\.2 \+\- 6\.8, 63\.7 \+\- 2\.5, 31\.8 \+\- 1\.7, 17\.4 \+\- 1\.0, 9\.73 \+\- 0\.59 \(Table 5\)\. Table 1 \(tbl\_a8cade374157\) summarises the systems \(no values\)\. COMPARISONS \(Tables 7\-9, pp\. 4\-5\)\. 'there is generally little agreement between any of the results' \(p\. 4\)\. This paper's 1H2 self\-broadening is about half the others'\: Cooper et al\. 1970 \(Ref\. 7\) and Knaap et al\. \(Ref\. 10\) 2\.8 and 3\.5 \(S0\(0\), S0\(1\)\) against 1\.19 and 1\.48 here; and Herring et al\. 1986 \(herring\_1986, Table V, FWHM\) 77 and 114 MHz/amagat at 295 K, i\.e\. 2\.36 and 3\.50e\-3 cm\-1 per bar at 293 K \(1 bar = 0\.920 amagat\), 2\.0 and 2\.4 times this paper's\. The 2H2 S0\(0\)\-S0\(4\) are 0\.72, 0\.60, 0\.60, 0\.36, 0\.39 of Knaap et al\.'s\. Whether this paper's sigma is a half width despite the FWHM statement cannot be settled from the paper\: the ratio to Cooper's and Herring's is 2\.0\-2\.4 for 1H2 but 1\.4\-2\.8 for 2H2\. Tables 7\-8 print Cooper et al\.'s \(Ref\. 7\) values, 2\.8 and 3\.5, in '10^3 cm\-1 bar\-1', but Herring et al\. print the same paper as 84 and 105 MHz/amagat = 2\.80 and 3\.50e\-3 cm\-1/amagat\: the comparison columns appear to be per amagat under a per\-bar label \(a 9 % difference at 293 K\)\. Herring et al\.'s citation of Ref\. 7 is 'V\. G\. Cooper, A\. D\. May, and B\. K\. Gupta, Can\. J\. Phys\. 48, 725 \(1970\)' \(the same paper, authors in another order\)\. Knaap et al\. \(Ref\. 10, knaap\_1979, curated 2026\-09\-27\) print half widths in figures only\: the 'Knaap et al\.' columns of Tables 7\-8 are twice those half widths per amagat \(for both 1H2 and 2H2 exactly twice keijser\_1974's Table I 293 K HWHM, to which they are re\-pointed\), so they are FWHM per amagat\. Against them this paper's own sigma is 0\.89\-0\.91 of the half width per bar for 1H2 S0\(0\)\-S0\(1\), 0\.50 for S0\(2\), and 1\.3\-1\.6 \(S0\(0\)\-S0\(2\)\) and 0\.8\-0\.9 \(S0\(3\)\-S0\(4\)\) for 2H2\: no single factor \(see knaap\_1979's notes\)\. TEMPERATURE\. The self\-broadening sigma of 2H2 S0\(0\) is 8\.56 \(90 K\), 5\.61 \(200 K\), 4\.05 \(293 K\), 3\.34 \(375 K\) x 10^\-3 cm\-1 bar\-1; the N2\- and CO\-broadened ones rise threefold from 293 to 100 K \(Table 6\)\. Per bar at fixed T, so part of the rise is the density factor 1/T\. solprop\: its D2 rotational linewidth is Table 2's 2H2 S0\(0\), 4\.05e\-3 cm\-1/bar at 293 K, taken as FWHM and converted to 131\.96e6 Hz/amagat \(4\.05e\-3 x 29\.9792458e9 Hz / 0\.92006 amagat per bar\)\: the conversion is right if sigma is a FWHM per bar; see the doubt above\. **Recorded bibliographic identity status:** VALIDATED\_WITH\_WARNINGS. This concerns identification of the source; it does not establish the scientific correctness of its contents. Datasets -------- edwards\_1991/table2\_H2 ~~~~~~~~~~~~~~~~~~~~~~~~ .. code-block:: text { "id": "table2_H2", "material": "H2", "file": "H2/edwards_1991__table2_H2.csv", "table": "tbl_10ca63d1c797", "quantity": "raman_linewidth", "unit": "cm-1/bar", "scale": 0.001, "abscissa": "label", "use": "primary", "uncertainty": { "column": true, "level": "not stated" }, "parameters": { "transition": "S0(J), per row", "width": "fwhm", "perturber": "self", "temperature_k": 293 } } Table 2 \(p\. 2\)\: self\-broadening coefficient sigma of the 1H2 S0\(J\) lines at 293 K, 10^3 sigma in cm\-1 per bar, from the pressure dependence of the FWHM over 1\-100 bar \(Dicke narrowing seen at 1\-10 bar; the fitted range and law are not stated\)\. Normal H2\. About half of the other measurements \(see the source notes\)\. edwards\_1991/table2\_D2 ~~~~~~~~~~~~~~~~~~~~~~~~ .. code-block:: text { "id": "table2_D2", "material": "D2", "file": "D2/edwards_1991__table2_D2.csv", "table": "tbl_10ca63d1c797", "quantity": "raman_linewidth", "unit": "cm-1/bar", "scale": 0.001, "abscissa": "label", "use": "primary", "uncertainty": { "column": true, "level": "not stated" }, "parameters": { "transition": "S0(J), per row", "width": "fwhm", "perturber": "self", "temperature_k": 293 } } Table 2 \(p\. 2\)\: self\-broadening coefficient sigma of the 2H2 S0\(J\) lines at 293 K, 10^3 sigma in cm\-1 per bar, 1\-60 bar\. The S0\(4\) cell prints a bullet for '±' \(image\)\. Table 8 repeats this column with S0\(2\) 2\.49 for 2\.46\. solprop's D2 rotational width is the S0\(0\) value, 4\.05e\-3 cm\-1/bar, converted as FWHM at 293 K with the ideal gas\. edwards\_1991/table3\_H2\_90K ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ .. code-block:: text { "id": "table3_H2_90K", "material": "H2", "file": "H2/edwards_1991__table3_H2_90K.csv", "table": "tbl_9facf32ff8c9", "quantity": "raman_linewidth", "unit": "cm-1/bar", "scale": 0.001, "abscissa": "label", "use": "primary", "uncertainty": { "column": true, "level": "not stated" }, "parameters": { "transition": "S0(J), per row", "width": "fwhm", "perturber": "self", "temperature_k": 90 } } Table 3 \(p\. 3\)\: self\-broadening sigma of 1H2 S0\(J\) at 90 K \(10^3 sigma, cm\-1 bar\-1\)\. The S0\(2\) line needed 16 scans \(p\. 3\)\. edwards\_1991/table3\_D2\_90K ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ .. code-block:: text { "id": "table3_D2_90K", "material": "D2", "file": "D2/edwards_1991__table3_D2_90K.csv", "table": "tbl_9facf32ff8c9", "quantity": "raman_linewidth", "unit": "cm-1/bar", "scale": 0.001, "abscissa": "label", "use": "primary", "uncertainty": { "column": true, "level": "not stated" }, "parameters": { "transition": "S0(J), per row", "width": "fwhm", "perturber": "self", "temperature_k": 90 } } Table 3 \(p\. 3\)\: self\-broadening sigma of 2H2 S0\(J\) at 90 K \(10^3 sigma, cm\-1 bar\-1\)\. S0\(4\) needed 16 scans\. edwards\_1991/table3\_D2\_200K ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ .. code-block:: text { "id": "table3_D2_200K", "material": "D2", "file": "D2/edwards_1991__table3_D2_200K.csv", "table": "tbl_9facf32ff8c9", "quantity": "raman_linewidth", "unit": "cm-1/bar", "scale": 0.001, "abscissa": "label", "use": "primary", "uncertainty": { "column": true, "level": "not stated" }, "parameters": { "transition": "S0(J), per row", "width": "fwhm", "perturber": "self", "temperature_k": 200 } } Table 3 \(p\. 3\)\: self\-broadening sigma of 2H2 S0\(0\) at 200 K, 1\-60 bar\. edwards\_1991/table3\_D2\_375K ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ .. code-block:: text { "id": "table3_D2_375K", "material": "D2", "file": "D2/edwards_1991__table3_D2_375K.csv", "table": "tbl_9facf32ff8c9", "quantity": "raman_linewidth", "unit": "cm-1/bar", "scale": 0.001, "abscissa": "label", "use": "primary", "uncertainty": { "column": true, "level": "not stated" }, "parameters": { "transition": "S0(J), per row", "width": "fwhm", "perturber": "self", "temperature_k": 375 } } Table 3 \(p\. 3\)\: self\-broadening sigma of 2H2 S0\(0\) at 375 K, 1\-60 bar\. edwards\_1991/table4\_H2\_He ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ .. code-block:: text { "id": "table4_H2_He", "material": "H2", "file": "H2/edwards_1991__table4_H2_He.csv", "table": "tbl_e5739c8fc9bb", "quantity": "raman_linewidth", "unit": "cm-1/bar", "scale": 0.001, "abscissa": "label", "use": "primary", "uncertainty": { "column": true, "level": "not stated" }, "parameters": { "transition": "S0(J), per row", "width": "fwhm", "perturber": "He", "temperature_k": 293 } } Table 4 \(p\. 3\)\: broadening coefficient sigma of the 1H2 S0\(J\) lines by He at 293 K \(10^3 sigma, cm\-1 bar\-1\)\: 1 bar of 1H2 with He added to 2\-100 bar total; per bar of total pressure as far as the paper says \(not stated explicitly\)\. edwards\_1991/table4\_H2\_Ar ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ .. code-block:: text { "id": "table4_H2_Ar", "material": "H2", "file": "H2/edwards_1991__table4_H2_Ar.csv", "table": "tbl_e5739c8fc9bb", "quantity": "raman_linewidth", "unit": "cm-1/bar", "scale": 0.001, "abscissa": "label", "use": "primary", "uncertainty": { "column": true, "level": "not stated" }, "parameters": { "transition": "S0(J), per row", "width": "fwhm", "perturber": "Ar", "temperature_k": 293 } } Table 4 \(p\. 3\)\: broadening coefficient sigma of the 1H2 S0\(J\) lines by Ar at 293 K \(10^3 sigma, cm\-1 bar\-1\)\: 1 bar of 1H2 with Ar added to 2\-100 bar total; per bar of total pressure as far as the paper says \(not stated explicitly\)\. edwards\_1991/table4\_H2\_O2 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ .. code-block:: text { "id": "table4_H2_O2", "material": "H2", "file": "H2/edwards_1991__table4_H2_O2.csv", "table": "tbl_e5739c8fc9bb", "quantity": "raman_linewidth", "unit": "cm-1/bar", "scale": 0.001, "abscissa": "label", "use": "primary", "uncertainty": { "column": true, "level": "not stated" }, "parameters": { "transition": "S0(J), per row", "width": "fwhm", "perturber": "O2", "temperature_k": 293 } } Table 4 \(p\. 3\)\: broadening coefficient sigma of the 1H2 S0\(J\) lines by O2 at 293 K \(10^3 sigma, cm\-1 bar\-1\)\: 1 bar of 1H2 with O2 added to 2\-100 bar total; per bar of total pressure as far as the paper says \(not stated explicitly\)\. edwards\_1991/table4\_H2\_N2 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ .. code-block:: text { "id": "table4_H2_N2", "material": "H2", "file": "H2/edwards_1991__table4_H2_N2.csv", "table": "tbl_e5739c8fc9bb", "quantity": "raman_linewidth", "unit": "cm-1/bar", "scale": 0.001, "abscissa": "label", "use": "primary", "uncertainty": { "column": true, "level": "not stated" }, "parameters": { "transition": "S0(J), per row", "width": "fwhm", "perturber": "N2", "temperature_k": 293 } } Table 4 \(p\. 3\)\: broadening coefficient sigma of the 1H2 S0\(J\) lines by N2 at 293 K \(10^3 sigma, cm\-1 bar\-1\)\: 1 bar of 1H2 with N2 added to 2\-100 bar total; per bar of total pressure as far as the paper says \(not stated explicitly\)\. edwards\_1991/table4\_H2\_CO ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ .. code-block:: text { "id": "table4_H2_CO", "material": "H2", "file": "H2/edwards_1991__table4_H2_CO.csv", "table": "tbl_e5739c8fc9bb", "quantity": "raman_linewidth", "unit": "cm-1/bar", "scale": 0.001, "abscissa": "label", "use": "primary", "uncertainty": { "column": true, "level": "not stated" }, "parameters": { "transition": "S0(J), per row", "width": "fwhm", "perturber": "CO", "temperature_k": 293 } } Table 4 \(p\. 3\)\: broadening coefficient sigma of the 1H2 S0\(J\) lines by CO at 293 K \(10^3 sigma, cm\-1 bar\-1\)\: 1 bar of 1H2 with CO added to 2\-100 bar total; per bar of total pressure as far as the paper says \(not stated explicitly\)\. edwards\_1991/table5\_D2\_He ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ .. code-block:: text { "id": "table5_D2_He", "material": "D2", "file": "D2/edwards_1991__table5_D2_He.csv", "table": "tbl_5006f1b3c92e", "quantity": "raman_linewidth", "unit": "cm-1/bar", "scale": 0.001, "abscissa": "label", "use": "primary", "uncertainty": { "column": true, "level": "not stated" }, "parameters": { "transition": "S0(J), per row", "width": "fwhm", "perturber": "He", "temperature_k": 293 } } Table 5 \(p\. 3\)\: broadening coefficient sigma of the 2H2 S0\(J\) lines by He at 293 K \(10^3 sigma, cm\-1 bar\-1\)\: 1 bar of 2H2 with He added to 2\-100 bar total; per bar of total pressure as far as the paper says \(not stated explicitly\)\. edwards\_1991/table5\_D2\_Ar ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ .. code-block:: text { "id": "table5_D2_Ar", "material": "D2", "file": "D2/edwards_1991__table5_D2_Ar.csv", "table": "tbl_5006f1b3c92e", "quantity": "raman_linewidth", "unit": "cm-1/bar", "scale": 0.001, "abscissa": "label", "use": "primary", "uncertainty": { "column": true, "level": "not stated" }, "parameters": { "transition": "S0(J), per row", "width": "fwhm", "perturber": "Ar", "temperature_k": 293 } } Table 5 \(p\. 3\)\: broadening coefficient sigma of the 2H2 S0\(J\) lines by Ar at 293 K \(10^3 sigma, cm\-1 bar\-1\)\: 1 bar of 2H2 with Ar added to 2\-100 bar total; per bar of total pressure as far as the paper says \(not stated explicitly\)\. edwards\_1991/table5\_D2\_O2 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ .. code-block:: text { "id": "table5_D2_O2", "material": "D2", "file": "D2/edwards_1991__table5_D2_O2.csv", "table": "tbl_5006f1b3c92e", "quantity": "raman_linewidth", "unit": "cm-1/bar", "scale": 0.001, "abscissa": "label", "use": "primary", "uncertainty": { "column": true, "level": "not stated" }, "parameters": { "transition": "S0(J), per row", "width": "fwhm", "perturber": "O2", "temperature_k": 293 } } Table 5 \(p\. 3\)\: broadening coefficient sigma of the 2H2 S0\(J\) lines by O2 at 293 K \(10^3 sigma, cm\-1 bar\-1\)\: 1 bar of 2H2 with O2 added to 2\-100 bar total; per bar of total pressure as far as the paper says \(not stated explicitly\)\. edwards\_1991/table5\_D2\_N2 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ .. code-block:: text { "id": "table5_D2_N2", "material": "D2", "file": "D2/edwards_1991__table5_D2_N2.csv", "table": "tbl_5006f1b3c92e", "quantity": "raman_linewidth", "unit": "cm-1/bar", "scale": 0.001, "abscissa": "label", "use": "primary", "uncertainty": { "column": true, "level": "not stated" }, "parameters": { "transition": "S0(J), per row", "width": "fwhm", "perturber": "N2", "temperature_k": 293 } } Table 5 \(p\. 3\)\: broadening coefficient sigma of the 2H2 S0\(J\) lines by N2 at 293 K \(10^3 sigma, cm\-1 bar\-1\)\: 1 bar of 2H2 with N2 added to 2\-100 bar total; per bar of total pressure as far as the paper says \(not stated explicitly\)\. edwards\_1991/table5\_D2\_CO ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ .. code-block:: text { "id": "table5_D2_CO", "material": "D2", "file": "D2/edwards_1991__table5_D2_CO.csv", "table": "tbl_5006f1b3c92e", "quantity": "raman_linewidth", "unit": "cm-1/bar", "scale": 0.001, "abscissa": "label", "use": "primary", "uncertainty": { "column": true, "level": "not stated" }, "parameters": { "transition": "S0(J), per row", "width": "fwhm", "perturber": "CO", "temperature_k": 293 } } Table 5 \(p\. 3\)\: broadening coefficient sigma of the 2H2 S0\(J\) lines by CO at 293 K \(10^3 sigma, cm\-1 bar\-1\)\: 1 bar of 2H2 with CO added to 2\-100 bar total; per bar of total pressure as far as the paper says \(not stated explicitly\)\. edwards\_1991/table6\_D2\_S0\_N2 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ .. code-block:: text { "id": "table6_D2_S0_N2", "material": "D2", "file": "D2/edwards_1991__table6_D2_S0_N2.csv", "table": "tbl_c97b652acc1c", "quantity": "raman_linewidth", "unit": "cm-1/bar", "scale": 0.001, "abscissa": "temperature", "abscissa_unit": "K", "use": "primary", "uncertainty": { "column": true, "level": "not stated" }, "parameters": { "transition": "S0(0)", "width": "fwhm", "perturber": "N2" } } Table 6 \(p\. 4\)\: broadening coefficient sigma of 2H2 S0\(0\) by N2 against temperature \(10^3 sigma, cm\-1 bar\-1\)\. The 293 K value repeats Table 5's 10\.4 with \+\- 0\.3 where Table 5 prints \+\- 0\.6\. edwards\_1991/table6\_D2\_S0\_CO ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ .. code-block:: text { "id": "table6_D2_S0_CO", "material": "D2", "file": "D2/edwards_1991__table6_D2_S0_CO.csv", "table": "tbl_c97b652acc1c", "quantity": "raman_linewidth", "unit": "cm-1/bar", "scale": 0.001, "abscissa": "temperature", "abscissa_unit": "K", "use": "primary", "uncertainty": { "column": true, "level": "not stated" }, "parameters": { "transition": "S0(0)", "width": "fwhm", "perturber": "CO" } } Table 6 \(p\. 4\)\: broadening coefficient sigma of 2H2 S0\(0\) by CO against temperature \(10^3 sigma, cm\-1 bar\-1\)\. The 293 K value repeats Table 5's 20\.0 with \+\- 0\.3 where Table 5 prints \+\- 1\.0\. edwards\_1991/table7\_this\_work ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ .. code-block:: text { "id": "table7_this_work", "material": "H2", "file": "H2/edwards_1991__table7_this_work.csv", "table": "tbl_2a3deb14c621", "quantity": "raman_linewidth", "unit": "cm-1/bar", "scale": 0.001, "abscissa": "label", "use": "check", "parameters": { "transition": "S0(J), per row", "width": "fwhm", "perturber": "self", "temperature_k": 293 } } Table 7 \(p\. 4\), 'This work'\: Table 2's 1H2 values repeated without errors\. edwards\_1991/table7\_may ~~~~~~~~~~~~~~~~~~~~~~~~~ .. code-block:: text { "id": "table7_may", "material": "H2", "file": "H2/edwards_1991__table7_may.csv", "table": "tbl_2a3deb14c621", "quantity": "raman_linewidth", "unit": "cm-1/bar", "scale": 0.001, "abscissa": "label", "use": "reproduced", "reproduced_from": [ "A. D. May, V. Degan, J. C. Stryland and H. L. Welsh, Can. J. Phys. 32, 1769 (1961)" ], "parameters": { "transition": "S0(J), per row", "width": "fwhm", "perturber": "self" } } Table 7 \(p\. 4\), Ref\. 4 \(May et al\., 100\-2000 bar at room temperature\), as Edwards et al\. print it in 10^3 cm\-1 bar\-1; the original's units and width convention are not stated here\. edwards\_1991/table7\_cooper\_1968 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ .. code-block:: text { "id": "table7_cooper_1968", "material": "H2", "file": "H2/edwards_1991__table7_cooper_1968.csv", "table": "tbl_2a3deb14c621", "quantity": "raman_linewidth", "unit": "cm-1/bar", "scale": 0.001, "abscissa": "label", "use": "reproduced", "reproduced_from": [ "V. G. Cooper, A. D. May, E. H. Hara and H. F. P. Knaap, Can. J. Phys. 46, 2019 (1968)" ], "parameters": { "transition": "S0(J), per row", "width": "fwhm", "perturber": "self" } } Table 7 \(p\. 4\), Ref\. 5 \(Cooper et al\. 1968\), as printed in 10^3 cm\-1 bar\-1\. edwards\_1991/table7\_cooper\_1970 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ .. code-block:: text { "id": "table7_cooper_1970", "material": "H2", "file": "H2/edwards_1991__table7_cooper_1970.csv", "table": "tbl_2a3deb14c621", "quantity": "raman_linewidth", "unit": "cm-1/bar", "scale": 0.001, "abscissa": "label", "use": "reproduced", "reproduced_from": [ "V. G. Cooper, B. K. Gupta and A. D. May, Can. J. Phys. 48, 725 (1970)" ], "parameters": { "transition": "S0(J), per row", "width": "fwhm", "perturber": "self" } } Table 7 \(p\. 4\), Ref\. 7 \(Cooper, Gupta and May 1970\), printed as 10^3 cm\-1 bar\-1\: 2\.8 and 3\.5, which are Cooper et al\.'s per\-AMAGAT FWHM coefficients \(herring\_1986 Table V prints the same paper as 84 and 105 MHz/amagat = 2\.80 and 3\.50e\-3 cm\-1/amagat\)\: the unit label here is probably wrong by the amagat\-to\-bar factor \(1 bar = 0\.92 amagat at 293 K\)\. edwards\_1991/table7\_knaap ~~~~~~~~~~~~~~~~~~~~~~~~~~~ .. code-block:: text { "id": "table7_knaap", "material": "H2", "file": "H2/edwards_1991__table7_knaap.csv", "table": "tbl_2a3deb14c621", "quantity": "raman_linewidth", "unit": "cm-1/bar", "scale": 0.001, "abscissa": "label", "use": "reproduced", "reproduced_from": [ "keijser_1974" ], "parameters": { "transition": "S0(J), per row", "width": "fwhm", "perturber": "self" } } Table 7 \(p\. 4\), Ref\. 10 \(Knaap, van den Hout and Hermans 1979 = knaap\_1979\), as printed in 10^3 cm\-1 bar\-1\. Against the original \(2026\-09\-27\)\: knaap\_1979 prints no numbers \(figures only, cross sections against T\) and its widths are HALF widths \(its Eq\. \(1\)\); these values are 0\.90\-0\.99 of twice the half widths read from its Fig\. 5 at about 295 K, i\.e\. FULL widths PER AMAGAT, not per bar \(the unit label is wrong, as for Ref\. 7\)\. Re\-pointed to keijser\_1974 \(2026\-09\-27\), the Leiden group's room\-temperature table\: twice its Table I nH2 HWHM \(0\.042, 0\.052, 0\.037, 0\.038, 0\.023 GHz/amagat at 293 K\) converted to cm\-1 is 2\.802, 3\.469, 2\.468, 2\.535, 1\.534e\-3 cm\-1/amagat, which rounds to these 2\.8, 3\.5, 2\.5, 2\.5, 1\.5 in every row\: Keijser's values, doubled to full widths, per amagat, cited under Knaap et al\. edwards\_1991/table8\_this\_work ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ .. code-block:: text { "id": "table8_this_work", "material": "D2", "file": "D2/edwards_1991__table8_this_work.csv", "table": "tbl_3b59e5b50be9", "quantity": "raman_linewidth", "unit": "cm-1/bar", "scale": 0.001, "abscissa": "label", "use": "check", "parameters": { "transition": "S0(J), per row", "width": "fwhm", "perturber": "self", "temperature_k": 293 } } Table 8 \(p\. 4\), 'This work'\: Table 2's 2H2 values repeated without errors, except S0\(2\) 2\.49 where Table 2 prints 2\.46 \+\- 0\.07 \(both images checked; unresolved, Table 2 is the primary\)\. edwards\_1991/table8\_knaap ~~~~~~~~~~~~~~~~~~~~~~~~~~~ .. code-block:: text { "id": "table8_knaap", "material": "D2", "file": "D2/edwards_1991__table8_knaap.csv", "table": "tbl_3b59e5b50be9", "quantity": "raman_linewidth", "unit": "cm-1/bar", "scale": 0.001, "abscissa": "label", "use": "reproduced", "reproduced_from": [ "keijser_1974" ], "parameters": { "transition": "S0(J), per row", "width": "fwhm", "perturber": "self" } } Table 8 \(p\. 4\), Ref\. 10 \(Knaap et al\. 1979 = knaap\_1979\), room\-temperature self\-broadening of 2H2, as printed in 10^3 cm\-1 bar\-1\. Against the original \(2026\-09\-27\)\: knaap\_1979 prints no numbers \(figures only\) and its widths are HALF widths; these are exactly twice Keijser et al\.'s 293 K HWHM per amagat \(2\.80, 2\.23, 2\.07, 1\.70, 1\.43, as smyth\_1987 quotes them, p\. 1008\), which are also the 295 K points of knaap\_1979's Fig\. 6\: FULL widths PER AMAGAT, not per bar\. Re\-pointed to keijser\_1974 \(2026\-09\-27\)\: twice its Table I nD2 HWHM \(0\.084, 0\.067, 0\.062, 0\.051, 0\.043 GHz/amagat, 293 K\) in cm\-1 is 5\.604, 4\.470, 4\.136, 3\.402, 2\.869e\-3 cm\-1/amagat, which rounds to these values in every row \(its S0\(5\), 0\.028, is not printed here\)\. edwards\_1991/table9\_this\_work\_He ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ .. code-block:: text { "id": "table9_this_work_He", "material": "H2", "file": "H2/edwards_1991__table9_this_work_He.csv", "table": "tbl_27adee9b3c93", "quantity": "raman_linewidth", "unit": "cm-1/bar", "scale": 0.001, "abscissa": "label", "use": "check", "parameters": { "transition": "S0(J), per row", "width": "fwhm", "perturber": "He", "temperature_k": 293 } } Table 9 \(p\. 5\), 'This work', He\: Table 4's values repeated without errors\. edwards\_1991/table9\_this\_work\_N2 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ .. code-block:: text { "id": "table9_this_work_N2", "material": "H2", "file": "H2/edwards_1991__table9_this_work_N2.csv", "table": "tbl_27adee9b3c93", "quantity": "raman_linewidth", "unit": "cm-1/bar", "scale": 0.001, "abscissa": "label", "use": "check", "parameters": { "transition": "S0(J), per row", "width": "fwhm", "perturber": "N2", "temperature_k": 293 } } Table 9 \(p\. 5\), 'This work', N2\: Table 4's values repeated without errors\. edwards\_1991/table9\_may\_He ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ .. code-block:: text { "id": "table9_may_He", "material": "H2", "file": "H2/edwards_1991__table9_may_He.csv", "table": "tbl_27adee9b3c93", "quantity": "raman_linewidth", "unit": "cm-1/bar", "scale": 0.001, "abscissa": "label", "use": "reproduced", "reproduced_from": [ "A. D. May, V. Degan, J. C. Stryland and H. L. Welsh, Can. J. Phys. 32, 1769 (1961)" ], "parameters": { "transition": "S0(J), per row", "width": "fwhm", "perturber": "He" } } Table 9 \(p\. 5\), Ref\. 4 \(May et al\.\), 1H2 broadened by He, room temperature, as printed\. edwards\_1991/table9\_dayan\_N2 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ .. code-block:: text { "id": "table9_dayan_N2", "material": "H2", "file": "H2/edwards_1991__table9_dayan_N2.csv", "table": "tbl_27adee9b3c93", "quantity": "raman_linewidth", "unit": "cm-1/bar", "scale": 0.001, "abscissa": "label", "use": "reproduced", "reproduced_from": [ "E. Dayan and J. P. Viennot, J. Raman Spectrosc. 9, 344 (1980)" ], "parameters": { "transition": "S0(J), per row", "width": "fwhm", "perturber": "N2" } } Table 9 \(p\. 5\), Ref\. 11 \(Dayan and Viennot\), 1H2 S0\(1\) broadened by N2, room temperature, as printed\. Formulas -------- No formulas are recorded. Corrections ----------- No dataset errata are recorded in this source record. Formula corrections, where recorded, appear with their formulas above. Curation notes may also discuss corrections or unresolved interpretation. Consult the :doc:`review register ` for the checks and decisions.