chan_1991 ========= W\. F\. Chan, G\. Cooper and C\. E\. Brion, "Absolute optical oscillator strengths for the electronic excitation of atoms at high resolution\: Experimental methods and measurements for helium", Phys\. Rev\. A 44, 186 \(1991\) `Source record `__ · :doc:`Catalogue ` · :doc:`Review register ` DOI: `10\.1103/PhysRevA\.44\.186 `__ **Source kind:** measurement **Recorded technique:** Dipole \(e,e\) electron\-energy\-loss spectroscopy at negligible momentum transfer\: a low\-resolution spectrometer \(8000 eV impact energy, 0 degrees, 1 eV FWHM, known Bethe\-Born factor\) gives the absolute df/dE of helium from 20 to 180 eV by Bethe\-Born conversion and Thomas\-Reiche\-Kuhn normalization to S\(0\) = 2 \(4\.65 % above 180 eV estimated from a fit A E^\-B, B = 2\.5583, to 72\-180 eV\); a high\-resolution double hemispherical spectrometer \(3000 eV, 0\.048\-0\.270 eV FWHM\), with its relative Bethe\-Born factor fitted to the ratio with the low\-resolution data at 28\-60 eV \(Eq\. 19\) and extrapolated below 25 eV, normalized at 30 eV \(and at 75 eV for the resonance region\), gives the discrete oscillator strengths 1 1S \-\> n 1P, n = 2\-7, by peak integration \(pp\. 195\-201\)\. **Materials in structured entries:** He **Dataset quantities:** differential\_oscillator\_strength, oscillator\_strength **Contents:** 22 datasets; 0 formulas. Curation notes -------------- Energies are energy losses \(photon energies\) in eV; the 1 1S \-\> 2 1P line at 21\.218 eV calibrates the scale \(p\. 196\)\. No photon flux or target density is measured\: the absolute scale rests on the TRK sum rule\. The low\-resolution table is cited in the text as 'Table I' \(p\. 196\), a misprint for Table II\. The low\-resolution df/dE at 1 eV FWHM near threshold \(24\.6\-25\.5 eV\) may contain unresolved high\-n discrete lines; the 2snp resonances near 60 eV are smeared \(60\.0 eV\: 1\.61e\-2 /eV\)\. No uncertainty is stated for Table II\. Samson et al\. \(1994, samson\_1994\)\: Chan's data 'tend to lie within 2 to 5 % of the present data from threshold to 75 eV', within \+\-2 % at 67\-110 eV, 'Towards higher energy their results tend to be too high'\. Conversion\: 1 Mb = 1\.0975e\-2 /eV of df/dE \(p\. 187\)\. Discrete oscillator strengths \(Table III, p\. 200\)\: 'The uncertainties quoted represent the scatter in the measurements made at different resolutions\. The absolute uncertainty is estimated to be ~5 %\.' The total to the ionization threshold, 0\.431, is printed with '\(0\.0006\)' \(probably a misprint\: its n = 2 term alone carries 0\.007; Samson et al\. quote 0\.431 \+\- 0\.02\); it and the totals of Dalgarno and Parkinson \(0\.424\) and Backx et al\. \(0\.421\) are not extracted \(not lines\)\. The table gives no transition energies; the rows use the principal quantum number n as the index \(as berkowitz\_1997, which reproduces the present column and prints the energies\)\. Autoionizing resonance maxima \(sp,2n\+\) 1P, n = 2\-5\: 60\.150, 63\.655 \(printed '63,655'\), 64\.465, 64\.820 eV \(p\. 202; figures only otherwise\)\. No sum rules S\(k\) other than the TRK normalization S\(0\) = 2 are given\. Errata \(Table III, theory rows\)\: Green, Johnson and Kolchin's 7 1P value and Schiff and Pekeris's 2 1P and 3 1P values are misprinted \(see the errata\)\. **Recorded bibliographic identity status:** VALIDATED\_WITH\_WARNINGS. This concerns identification of the source; it does not establish the scientific correctness of its contents. Datasets -------- chan\_1991/df\_dE ~~~~~~~~~~~~~~~~~ .. code-block:: text { "id": "df_dE", "material": "He", "file": "He/chan_1991__df_dE.csv", "table": "tbl_bd7d4d0ec5c7", "quantity": "differential_oscillator_strength", "unit": "1/eV", "scale": 0.01, "abscissa_unit": "eV", "wavelength_medium": "vacuum", "use": "primary" } Table II, low\-resolution \(1 eV FWHM\) dipole \(e,e\) absolute df/dE, 24\.6\-180 eV \(153 rows\), in 1e\-2 /eV; TRK\-normalized, independent of optical measurements\. Uncertainty not stated \(see the source notes for Samson et al\.'s comparison\)\. chan\_1991/f\_present ~~~~~~~~~~~~~~~~~~~~~ .. code-block:: text { "id": "f_present", "material": "He", "file": "He/chan_1991__f_present.csv", "table": "tbl_ae85cd966ffd", "quantity": "oscillator_strength", "abscissa": "label", "use": "primary", "uncertainty": { "column": true, "systematic_relative": 0.05, "level": "not stated" } } Table III \(experiment\), 'Present work \[HR dipole \(e,e\)\]'\: 1 1S \-\> n 1P, n = 2\-7 \(rows and index n\); parenthesized uncertainties are the scatter over energy resolutions, plus an absolute \(scale\) uncertainty of about 5 % \(p\. 200\), stored as systematic\_relative \(level not stated\)\. Reproduced by berkowitz\_1997 \(f\_chan\_1991\)\. chan\_1991/f\_fernley\_1987 ~~~~~~~~~~~~~~~~~~~~~~~~~~~ .. code-block:: text { "id": "f_fernley_1987", "material": "He", "file": "He/chan_1991__f_fernley_1987.csv", "table": "tbl_ae85cd966ffd", "quantity": "oscillator_strength", "abscissa": "label", "use": "reproduced", "reproduced_from": [ "J. A. Fernley, K. T. Taylor and M. J. Seaton, J. Phys. B 20, 6457 (1987)" ] } Table III \(theory\), 1 1S \-\> n 1P oscillator strengths, rows and index n = 2\-7\: Fernley, Taylor and Seaton \(Ref\. 9\), R\-matrix \(Opacity Project\)\. chan\_1991/f\_schiff\_1971 ~~~~~~~~~~~~~~~~~~~~~~~~~~ .. code-block:: text { "id": "f_schiff_1971", "material": "He", "file": "He/chan_1991__f_schiff_1971.csv", "table": "tbl_ae85cd966ffd", "quantity": "oscillator_strength", "abscissa": "label", "use": "reproduced", "reproduced_from": [ "B. Schiff, C. L. Pekeris and Y. Accad, Phys. Rev. A 4, 885 (1971)" ] } Table III \(theory\), 1 1S \-\> n 1P oscillator strengths, rows and index n = 2\-7\: Schiff, Pekeris and Accad \(Ref\. 8\)\. chan\_1991/f\_weiss\_1967 ~~~~~~~~~~~~~~~~~~~~~~~~~ .. code-block:: text { "id": "f_weiss_1967", "material": "He", "file": "He/chan_1991__f_weiss_1967.csv", "table": "tbl_ae85cd966ffd", "quantity": "oscillator_strength", "abscissa": "label", "use": "reproduced", "reproduced_from": [ "A. W. Weiss, J. Res. Natl. Bur. Stand. 71A, 163 (1967)" ] } Table III \(theory\), 1 1S \-\> n 1P oscillator strengths, rows and index n = 2\-7\: Weiss \(Ref\. 7\)\. chan\_1991/f\_green\_1967 ~~~~~~~~~~~~~~~~~~~~~~~~~ .. code-block:: text { "id": "f_green_1967", "material": "He", "file": "He/chan_1991__f_green_1967.csv", "table": "tbl_ae85cd966ffd", "quantity": "oscillator_strength", "abscissa": "label", "use": "reproduced", "reproduced_from": [ "L. C. Green, N. C. Johnson and E. K. Kolchin, Astrophys. J. 144, 369 (1967)" ] } Table III \(theory\), 1 1S \-\> n 1P oscillator strengths, rows and index n = 2\-7\: Green, Johnson and Kolchin \(Ref\. 5\)\. chan\_1991/f\_dalgarno\_parkinson\_1967 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ .. code-block:: text { "id": "f_dalgarno_parkinson_1967", "material": "He", "file": "He/chan_1991__f_dalgarno_parkinson_1967.csv", "table": "tbl_ae85cd966ffd", "quantity": "oscillator_strength", "abscissa": "label", "use": "reproduced", "reproduced_from": [ "A. Dalgarno and E. M. Parkinson, Proc. R. Soc. London Ser. A 301, 253 (1967)" ] } Table III \(theory\), 1 1S \-\> n 1P oscillator strengths, rows and index n = 2\-7\: Dalgarno and Parkinson \(Ref\. 6\); their total to the ionization threshold, 0\.424, is not extracted\. chan\_1991/f\_wiese\_1966 ~~~~~~~~~~~~~~~~~~~~~~~~~ .. code-block:: text { "id": "f_wiese_1966", "material": "He", "file": "He/chan_1991__f_wiese_1966.csv", "table": "tbl_ae85cd966ffd", "quantity": "oscillator_strength", "abscissa": "label", "use": "reproduced", "reproduced_from": [ "W. L. Wiese, M. W. Smith and B. M. Glennon, Atomic Transition Probabilities: Hydrogen through Neon, Natl. Stand. Ref. Data Ser., Natl. Bur. Stand. (U.S.) Circ. No. 4" ] } Table III \(theory\), 1 1S \-\> n 1P oscillator strengths, rows and index n = 2\-7\: Wiese, Smith and Glennon \(Ref\. 10\), the NBS compilation\. chan\_1991/f\_schiff\_pekeris\_1964 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ .. code-block:: text { "id": "f_schiff_pekeris_1964", "material": "He", "file": "He/chan_1991__f_schiff_pekeris_1964.csv", "table": "tbl_ae85cd966ffd", "quantity": "oscillator_strength", "abscissa": "label", "use": "reproduced", "reproduced_from": [ "B. Schiff and C. L. Pekeris, Phys. Rev. A 134, 638 (1964)" ] } Table III \(theory\), 1 1S \-\> n 1P oscillator strengths, rows and index n = 2\-7\: Schiff and Pekeris \(Ref\. 4\)\. chan\_1991/f\_dalgarno\_stewart\_1960 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ .. code-block:: text { "id": "f_dalgarno_stewart_1960", "material": "He", "file": "He/chan_1991__f_dalgarno_stewart_1960.csv", "table": "tbl_ae85cd966ffd", "quantity": "oscillator_strength", "abscissa": "label", "use": "reproduced", "reproduced_from": [ "A. Dalgarno and A. L. Stewart, Proc. Phys. Soc. London 76, 49 (1960)" ] } Table III \(theory\), 1 1S \-\> n 1P oscillator strengths, rows and index n = 2\-7\: Dalgarno and Stewart \(Ref\. 3\)\. chan\_1991/f\_tsurubuchi\_1989 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ .. code-block:: text { "id": "f_tsurubuchi_1989", "material": "He", "file": "He/chan_1991__f_tsurubuchi_1989.csv", "table": "tbl_ae85cd966ffd", "quantity": "oscillator_strength", "abscissa": "label", "use": "reproduced", "reproduced_from": [ "S. Tsurubuchi, K. Watanabe and T. Arikawa, J. Phys. B 22, 2969 (1989)" ], "uncertainty": { "column": true, "level": "not stated" } } Table III \(experiment\), 1 1S \-\> n 1P oscillator strengths, rows and index n = 2\-7\: Tsurubuchi, Watanabe and Arikawa \(Ref\. 20\), self absorption\. Parenthesized uncertainties \(level not stated\)\. chan\_1991/f\_westerveld\_1977 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ .. code-block:: text { "id": "f_westerveld_1977", "material": "He", "file": "He/chan_1991__f_westerveld_1977.csv", "table": "tbl_ae85cd966ffd", "quantity": "oscillator_strength", "abscissa": "label", "use": "reproduced", "reproduced_from": [ "W. B. Westerveld and J. Van Eck, J. Quant. Spectrosc. Radiat. Transfer 17, 131 (1977)" ], "uncertainty": { "column": true, "level": "not stated" } } Table III \(experiment\), 1 1S \-\> n 1P oscillator strengths, rows and index n = 2\-7\: Westerveld and Van Eck \(Ref\. 19\), self absorption\. Parenthesized uncertainties \(level not stated\)\. chan\_1991/f\_backx\_1975 ~~~~~~~~~~~~~~~~~~~~~~~~~ .. code-block:: text { "id": "f_backx_1975", "material": "He", "file": "He/chan_1991__f_backx_1975.csv", "table": "tbl_ae85cd966ffd", "quantity": "oscillator_strength", "abscissa": "label", "use": "reproduced", "reproduced_from": [ "C. Backx, R. R. Tol, G. R. Wight and M. J. Van der Wiel, J. Phys. B 8, 2050 (1975)" ], "excluded_rows": { "2": "the normalization point: Schiff and Pekeris's theoretical n = 2 value (note a), not a measurement" } } Table III \(experiment\), 1 1S \-\> n 1P oscillator strengths, rows and index n = 2\-7\: Backx et al\. \(Ref\. 47\), electron impact, 'relative measurements normalized to the theoretical value for n=2 reported by Schiff and Pekeris' \(note a\); their total 0\.421 is not extracted\. chan\_1991/f\_burger\_lurio\_1971 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ .. code-block:: text { "id": "f_burger_lurio_1971", "material": "He", "file": "He/chan_1991__f_burger_lurio_1971.csv", "table": "tbl_ae85cd966ffd", "quantity": "oscillator_strength", "abscissa": "label", "use": "reproduced", "reproduced_from": [ "J. M. Burger and A. Lurio, Phys. Rev. A 3, 64 (1971)" ], "uncertainty": { "column": true, "level": "not stated" } } Table III \(experiment\), 1 1S \-\> n 1P oscillator strengths, rows and index n = 2\-7\: Burger and Lurio \(Ref\. 13\), level\-crossing lifetimes\. Parenthesized uncertainties \(level not stated\)\. chan\_1991/f\_de\_jongh\_1971 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ .. code-block:: text { "id": "f_de_jongh_1971", "material": "He", "file": "He/chan_1991__f_de_jongh_1971.csv", "table": "tbl_ae85cd966ffd", "quantity": "oscillator_strength", "abscissa": "label", "use": "reproduced", "reproduced_from": [ "J. P. De Jongh and J. Van Eck, Physica 51, 104 (1971)" ], "excluded_rows": { "2": "the normalization point: Weiss's theoretical n = 2 value (note b), not a measurement" }, "uncertainty": { "column": true, "level": "not stated" } } Table III \(experiment\), 1 1S \-\> n 1P oscillator strengths, rows and index n = 2\-7\: De Jongh and Van Eck \(Ref\. 18\), self absorption, 'relative measurements normalized to the theoretical value for n=2 reported by Weiss' \(note b\)\. chan\_1991/f\_lassettre\_1970 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ .. code-block:: text { "id": "f_lassettre_1970", "material": "He", "file": "He/chan_1991__f_lassettre_1970.csv", "table": "tbl_ae85cd966ffd", "quantity": "oscillator_strength", "abscissa": "label", "use": "reproduced", "reproduced_from": [ "E. N. Lassettre, A. Skerbele and M. A. Dillon, J. Chem. Phys. 52, 2797 (1970)" ], "uncertainty": { "column": true, "level": "not stated" } } Table III \(experiment\), 1 1S \-\> n 1P oscillator strengths, rows and index n = 2\-7\: Lassettre, Skerbele and Dillon, electron impact; the table cites 'Ref\. 30' \(Huffman et al\., a different paper\) but the text cites them as Ref\. 39 \(p\. 201\)\: the table's reference number is a misprint\. Parenthesized uncertainties \(level not stated\)\. chan\_1991/f\_martinson\_1969 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ .. code-block:: text { "id": "f_martinson_1969", "material": "He", "file": "He/chan_1991__f_martinson_1969.csv", "table": "tbl_ae85cd966ffd", "quantity": "oscillator_strength", "abscissa": "label", "use": "reproduced", "reproduced_from": [ "I. Martinson and W. S. Bickel, Phys. Lett. 30A, 524 (1969)" ], "uncertainty": { "column": true, "level": "not stated" } } Table III \(experiment\), 1 1S \-\> n 1P oscillator strengths, rows and index n = 2\-7\: Martinson and Bickel \(Ref\. 14\), beam\-foil lifetime\. Parenthesized uncertainties \(level not stated\)\. chan\_1991/f\_fry\_williams\_1969 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ .. code-block:: text { "id": "f_fry_williams_1969", "material": "He", "file": "He/chan_1991__f_fry_williams_1969.csv", "table": "tbl_ae85cd966ffd", "quantity": "oscillator_strength", "abscissa": "label", "use": "reproduced", "reproduced_from": [ "E. S. Fry and W. L. Williams, Phys. Rev. 183, 81 (1969)" ], "uncertainty": { "column": true, "level": "not stated" } } Table III \(experiment\), 1 1S \-\> n 1P oscillator strengths, rows and index n = 2\-7\: Fry and Williams \(Ref\. 12\), Hanle effect\. Parenthesized uncertainties \(level not stated\)\. chan\_1991/f\_lincke\_griem\_1966 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ .. code-block:: text { "id": "f_lincke_griem_1966", "material": "He", "file": "He/chan_1991__f_lincke_griem_1966.csv", "table": "tbl_ae85cd966ffd", "quantity": "oscillator_strength", "abscissa": "label", "use": "reproduced", "reproduced_from": [ "R. Lincke and H. R. Griem, Phys. Rev. 143, 66 (1966)" ], "uncertainty": { "column": true, "level": "not stated" } } Table III \(experiment\), 1 1S \-\> n 1P oscillator strengths, rows and index n = 2\-7\: Lincke and Griem \(Ref\. 15\), plasma emission profile\. Parenthesized uncertainties \(level not stated\)\. chan\_1991/f\_korolyov\_1965 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ .. code-block:: text { "id": "f_korolyov_1965", "material": "He", "file": "He/chan_1991__f_korolyov_1965.csv", "table": "tbl_ae85cd966ffd", "quantity": "oscillator_strength", "abscissa": "label", "use": "reproduced", "reproduced_from": [ "F. A. Korolyov and V. I. Odintsov, Opt. Spectrosc. 18, 547 (1965)" ], "uncertainty": { "column": true, "level": "not stated" } } Table III \(experiment\), 1 1S \-\> n 1P oscillator strengths, rows and index n = 2\-7\: Korolyov and Odintsov \(Ref\. 16\), beam emission profile\: two n = 2 values on consecutive rows, 0\.28\(0\.02\) \(row 2\-1\) and 0\.26\(0\.012\) \(row 2\-2, unlabelled in the table\)\. Parenthesized uncertainties \(level not stated\)\. chan\_1991/f\_kuhn\_1964 ~~~~~~~~~~~~~~~~~~~~~~~~ .. code-block:: text { "id": "f_kuhn_1964", "material": "He", "file": "He/chan_1991__f_kuhn_1964.csv", "table": "tbl_ae85cd966ffd", "quantity": "oscillator_strength", "abscissa": "label", "use": "reproduced", "reproduced_from": [ "H. G. Kuhn and J. M. Vaughan, Proc. R. Soc. London Ser. A 277, 297 (1964)" ], "uncertainty": { "column": true, "level": "not stated" } } Table III \(experiment\), 1 1S \-\> n 1P oscillator strengths, rows and index n = 2\-7\: Kuhn and Vaughan \(Ref\. 17\), resonance\-broadening emission profile \(0\.37, far from all others\)\. Parenthesized uncertainties \(level not stated\)\. chan\_1991/f\_geiger\_1963 ~~~~~~~~~~~~~~~~~~~~~~~~~~ .. code-block:: text { "id": "f_geiger_1963", "material": "He", "file": "He/chan_1991__f_geiger_1963.csv", "table": "tbl_ae85cd966ffd", "quantity": "oscillator_strength", "abscissa": "label", "use": "reproduced", "reproduced_from": [ "J. Geiger, Z. Phys. 175, 530 (1963)" ], "uncertainty": { "column": true, "level": "not stated" } } Table III \(experiment\), 1 1S \-\> n 1P oscillator strengths, rows and index n = 2\-7\: Geiger \(Ref\. 63\), electron impact normalized to elastic scattering; 'large departures from the present data and also from the calculations' \(p\. 201\)\. Parenthesized uncertainties \(level not stated\)\. Formulas -------- No formulas are recorded. Corrections ----------- .. code-block:: text [ { "dataset": "f_green_1967", "row": "7", "column": "value", "printed": "0.0525", "corrected": "0.00525", "reason": "A dropped zero: the printed 7 1P oscillator strength is larger than the 6 1P value (0.008461) and ten times every other author's 7 1P value in the table (0.005469, 0.0054, 0.00593, 0.00587).", "evidence": "Table III image checked (it prints '0.05 25'); the n^-3 scaling of the series from Green et al.'s own n = 5, 6 values (0.01484, 0.008461) gives 0.0053 for n = 7." }, { "dataset": "f_schiff_pekeris_1964", "row": "2", "column": "value", "printed": "0.02762", "corrected": "0.2762", "reason": "Misplaced decimal point: ten times smaller than every other 2 1P value (0.2762 by Schiff, Pekeris and Accad and by Wiese et al.); the text says the present 0.280 is 'in excellent agreement' with Schiff and Pekeris (abstract, p. 186; Discussion, p. 201), and Backx et al. normalized to Schiff and Pekeris's n = 2 value, printed 0.276.", "evidence": "Table III image checked (it prints '0.027 62')." }, { "dataset": "f_schiff_pekeris_1964", "row": "3", "column": "value", "printed": "0.00734", "corrected": "0.0734", "reason": "Misplaced decimal point, as for 2 1P: the other 3 1P values are 0.0729-0.0746.", "evidence": "Table III image checked (it prints '0.007 34')." } ] 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.