sadeghi_2022
============

N\. Sadeghi, R\. Magnan and F\. Massines, "Pressure broadening of 772\.376 and 772\.421 nm argon lines and kinetics of argon metastable atoms", J\. Quant\. Spectrosc\. Radiat\. Transfer 288, 108264 \(2022\)

`Source record <https://github.com/LupoLab/optmat/blob/main/src/optmat/data/sources/sadeghi_2022.toml>`__ · :doc:`Catalogue </the-data/sources>` · :doc:`Review register </register>`

DOI: `10\.1016/j\.jqsrt\.2022\.108264 <https://doi.org/10.1016/j.jqsrt.2022.108264>`__

**Source kind:** measurement

**Recorded technique:** Time\-resolved tunable diode laser absorption \(DFB diode, \< 10 MHz, scanned by temperature in 2\.180 \+\- 0\.025 pm steps calibrated by a 375\.0 MHz FSR confocal Fabry\-Perot and the 44\.66 pm gap between the lines; unshifted positions from a low\-pressure argon reference cell\) on the metastable atoms Ar\*\(1s5\) and Ar\*\(1s3\) of a 20 kHz plane\-to\-plane glow dielectric barrier discharge in flowing Ar \+ 200 ppm NH3 at 312, 455, 678, 816 and 1000 mbar, gas temperature about 310 K \(the Gaussian width at 312 mbar; N2 second positive band at 1 atm, 305 K\)\. The blended profiles of the 772\.376 nm \(1s5\-2p7\) and 772\.4207 nm \(1s3\-2p2\) lines are fitted with two Voigt profiles; the Lorentzian FWHM and shift are fitted linearly in pressure through the origin \(Fig\. 7\)\.

**Materials in structured entries:** Ar

**Dataset quantities:** pressure\_line\_coefficient

**Contents:** 2 datasets; 0 formulas.

Curation notes
--------------

J\. Quant\. Spectrosc\. Radiat\. Transfer 288, 108264 \(2022\)\. The library holds the HAL deposit hal\-03782652v1 \(submitted 21 September 2022; 25 PDF pages\: a HAL cover, then the authors' manuscript numbered 1\-24, manuscript page = PDF page \- 1\), not the journal's typeset version; page numbers below are the manuscript's\. Identity checked on the HAL cover and manuscript p\. 1 \(title, authors Sadeghi, Magnan and Massines, LIPhy and LTM Grenoble, PROMES Perpignan; the cover's citation gives journal, volume, article number and DOI\) on 2026\-10\-12\. The values were read on the rendered pages 1 and 11 and Table 1's image \(p\. 17\)\. The version of record was not seen\: its numbers could differ\.

ONE\-PHOTON 4s\-4p LINES, NOT OEP 8's COHERENCE\. These are one\-photon absorption lines from the metastable 4s levels to 4p levels, broadened and shifted by ground\-state argon \(van der Waals; neither level is connected to the ground state, p\. 12\)\. OEP 8 needs the dephasing of the ground\-to\-4p two\-photon coherence by argon; the width of a 4s\-4p line contains the 4s level's broadening as well, so nothing for the two\-photon coherence is derived from these values\.

LEVELS \(Paschen, the paper's; NIST Ar\_I\_levels\.tsv and Ar\_I\_lines\_nir\.tsv\)\. 772\.376 nm\: 1s5 = 4s\[3/2\]2 = 3p5\(2P\*3/2\)4s 2\[3/2\]\* J = 2 \(93143\.76 cm\-1\) \- 2p7 = 4p\[3/2\]1 = 3p5\(2P\*3/2\)4p 2\[3/2\] J = 1 \(106087\.26\); 772\.4207 nm\: 1s3 = 4s'\[1/2\]0 = 3p5\(2P\*1/2\)4s 2\[1/2\]\* J = 0 \(94553\.67\) \- 2p2 = 4p'\[1/2\]1 = 3p5\(2P\*1/2\)4p 2\[1/2\] J = 1 \(107496\.42\)\. The printed wavelengths are air wavelengths\: NIST's vacuum 772\.5887 and 772\.6333 nm divided by the index of air \(about 1\.000275\) give 772\.376 and 772\.421 nm\. The upper level 2p2 is one of baig\_2008's photoionised levels; neither upper level is one of OEP 8's two\-photon \(J = 0, 2\) levels\.

TAKEN \(inline, the abstract, p\. 1\)\: 'w1=28\.3\+\-2\.0 pm \(14\.2\+\-1\.0 GHz\) and s1=11\.5\+\-0\.8 pm \(\-5\.8\+\-0\.4 GHz\) for 772\.376 nm line and w2=36\.3\+\-0\.5 pm \(18\.2\+\-0\.3 GHz\) and s2=12\.8\+\-0\.7 pm \(\-6\.4\+\-0\.4 GHz\) for 772\.4207 nm line, at 1 bar and 300 K'\. The frequency values are held\: a width in GHz at 1 bar is the same number in MHz/mbar \(1 GHz/bar = 1 MHz/mbar exactly\), so unit MHz/mbar with the printed numbers\. w is the FWHM of the Lorentzian component \(p\. 11\), in ordinary frequency; s is a red shift in pm, printed negative in GHz, which is the vocabulary's sign \(positive to the blue\)\. Perturber self\: argon with 200 ppm NH3\. The 300 K values are the authors' scaling of the measured slopes at about 310 K by T^\-0\.7 \(p\. 11\); temperature\_k = 300\. Uncertainties\: '2 sigma of the fit \+1\.3% uncertainty from the wavelength gap between steps' \(p\. 11\)\. use primary\.

CHECKED \(2026\-10\-12\)\. The GHz values against the pm values\: Delta nu = c Delta lambda / lambda^2 with the air wavelengths gives 14\.23, 5\.78, 18\.25 and 6\.43 GHz for 28\.3, 11\.5, 36\.3 and 12\.8 pm \(the printed 14\.2, 5\.8, 18\.2, 6\.4\); the uncertainties 1\.00, 0\.40, 0\.25 and 0\.35 GHz \(printed 1\.0, 0\.4, 0\.3, 0\.4\)\. Table 1 \(p\. 17, image\) prints the same pm values\. The measured slopes at about 310 K \(p\. 11\)\: w1 = 27\.7 \+\- 2, s1 = 11\.3 \+\- 0\.8, w2 = 35\.5 \+\- 0\.5, s2 = 12\.5 \+\- 0\.7 pm/bar \('pm\.bar' for s2 in the library text; the page image prints pm\.bar^\-1\); times \(310/300\)^0\.7 = 1\.0232 they give 28\.34, 11\.56, 36\.32 and 12\.79, the printed 28\.3, 11\.5, 36\.3 and 12\.8\: s1 would round to 11\.6, a 0\.06 pm difference well inside its \+\-0\.8 \(not an erratum; the slopes are printed to 0\.1 pm\)\.

FINDINGS\. The paper's own van der Waals estimates \(Table 1\)\: 25\.8 and 31\.0 pm \(Eq\. 3, the Physicist's Desk Reference / NIST form\) and 29\.4 and 35\.2 pm \(Eq\. 7, its corrected factor 3\.41\) against the measured 28\.3 and 36\.3\. The Einstein A values used for the densities \(p\. 14\), 5\.18 x 10^6 and 1\.17 x 10^7 s\-1 'taken from' NIST \(ref\. 45\), are NIST's 5\.2e6 and 1\.17e7 \(Ar\_I\_lines\_nir\.tsv\) and are not taken\.

NOT TAKEN\. The measured 310 K slopes in pm/bar \(above; the vocabulary has no wavelength per pressure unit, and the 300 K frequency values are what the paper gives in frequency\)\. Table 1's comparison columns\: Williamson et al\.'s width \(ref\. 58\), 40 pm, derived by the authors from a 2\.1 GHz Lorentzian width at 100 Torr and 410 K; Moussounda and Ranson's shifts \(ref\. 28\), 13\.5 and 14\.5 pm, scaled by the authors from about 2000 K; the shift/width ratios 0\.4 and 0\.35\. The metastable densities, the three\-body and two\-body quenching coefficients of Ar\*\(1s5\) and Ar\*\(1s3\) quoted from ref\. 50 \(1\.1 \+\- 0\.4 and 0\.83 \+\- 0\.3 x 10^\-44 m6 s\-1; 2\.1 and 5\.3 x 10^\-21 m3 s\-1\) and the derived transfer coefficients \(4s levels, not the 4p levels of OEP 8; quoted\), Table 2 \(discharge voltages and E/N\) and the figures\. No two\-photon data\.

**Recorded bibliographic identity status:** VALIDATED\_WITH\_WARNINGS. This concerns identification of the source; it does not establish the scientific correctness of its contents.

Datasets
--------

sadeghi\_2022/broadening\_self
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

.. code-block:: text

   {
     "id": "broadening_self",
     "material": "Ar",
     "table": "text",
     "quantity": "pressure_line_coefficient",
     "unit": "MHz/mbar",
     "abscissa": "label",
     "use": "primary",
     "uncertainty": {
       "column": true,
       "level": "2 sigma"
     },
     "parameters": {
       "effect": "broadening",
       "transition": "the rows: 772.376 nm (1s5-2p7, 4s[3/2]2 - 4p[3/2]1) and 772.4207 nm (1s3-2p2, 4s'[1/2]0 - 4p'[1/2]1), air wavelengths",
       "photons": 1,
       "frequency_scale": "transition",
       "width": "fwhm",
       "frequency_variable": "ordinary",
       "perturber": "self (argon with 200 ppm NH3)",
       "temperature_k": 300,
       "pressure_range": "312-1000 mbar",
       "method": "time-resolved diode laser absorption on metastables in a glow DBD, double Voigt fits, linear fit through the origin; scaled from about 310 K to 300 K by T^-0.7"
     }
   }

2 inline points in the source record.

Abstract \(p\. 1\)\: the pressure broadening w1 = '28\.3\+\-2\.0 pm \(14\.2\+\-1\.0 GHz\)' and w2 = '36\.3\+\-0\.5 pm \(18\.2\+\-0\.3 GHz\)' at 1 bar and 300 K, held as MHz/mbar \(the same numbers\); the Lorentzian FWHM in ordinary frequency\. Scaled by the authors from about 310 K \(27\.7 and 35\.5 pm/bar measured\) by T^\-0\.7\. Air wavelengths\. One\-photon 4s\-4p lines, not the ground\-to\-4p two\-photon coherence \(record notes\)\.

sadeghi\_2022/shift\_self
~~~~~~~~~~~~~~~~~~~~~~~~~

.. code-block:: text

   {
     "id": "shift_self",
     "material": "Ar",
     "table": "text",
     "quantity": "pressure_line_coefficient",
     "unit": "MHz/mbar",
     "abscissa": "label",
     "use": "primary",
     "uncertainty": {
       "column": true,
       "level": "2 sigma"
     },
     "parameters": {
       "effect": "shift",
       "transition": "the rows: 772.376 nm (1s5-2p7, 4s[3/2]2 - 4p[3/2]1) and 772.4207 nm (1s3-2p2, 4s'[1/2]0 - 4p'[1/2]1), air wavelengths",
       "photons": 1,
       "frequency_scale": "transition",
       "width": "none",
       "frequency_variable": "ordinary",
       "perturber": "self (argon with 200 ppm NH3)",
       "temperature_k": 300,
       "pressure_range": "312-1000 mbar",
       "method": "time-resolved diode laser absorption on metastables in a glow DBD, double Voigt fits, linear fit through the origin; scaled from about 310 K to 300 K by T^-0.7"
     }
   }

2 inline points in the source record.

Abstract \(p\. 1\)\: the shift s1 = '11\.5\+\-0\.8 pm \(\-5\.8\+\-0\.4 GHz\)' and s2 = '12\.8\+\-0\.7 pm \(\-6\.4\+\-0\.4 GHz\)' at 1 bar and 300 K, held as MHz/mbar \(the same numbers\); to the red \(negative\)\. Scaled by the authors from about 310 K \(11\.3 and 12\.5 pm/bar measured\) by T^\-0\.7\. Air wavelengths\. One\-photon 4s\-4p lines, not the ground\-to\-4p two\-photon coherence \(record notes\)\.

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 </register>` for the checks and decisions.