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 · Catalogue · Review register

DOI: 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

{
  "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

{
  "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 review register for the checks and decisions.