gornik_1982

W. Gornik, E. Matthias and D. Schmidt, “Two-photon excitation of the lowest g states in Xe2*”, J. Phys. B: At. Mol. Phys. 15, 3413-3422 (1982)

Source record · Catalogue · Review register

DOI: 10.1088/0022-3700/15/19/011

Source kind: measurement

Recorded technique: Two-photon excitation spectra of xenon at 50-500 Torr over 62 500-70 200 cm^-1 (two-photon scale; laser 320-285 nm) with a frequency-doubled pulsed dye laser (UV pulse about 3 ns, bandwidth 25 GHz, ‘approximately 20 MW cm^-2’ at the focus, excitation volume about 4 x 10^-5 cm^3), linear and circular polarisation; VUV fluorescence (110-190 nm, solar-blind EMR 541 G photomultiplier, photon counting, detected fraction 5 x 10^-4), first and second continua separated by a quartz cut-off filter. Tuning accuracy ‘better than 10 cm^-1 on the two-photon scale’, intensity scale about 10 % (p. 3414).

Materials in structured entries: Xe

Dataset quantities: collisional_quenching_rate_coefficient, level_energy

Contents: 2 datasets; 0 formulas.

Curation notes

J. Phys. B: At. Mol. Phys. 15, 3413-3422 (1982) = PDF pages 2-11 (PDF page 1 is the IOP download cover; journal page = PDF page + 3411). Identity checked on the first page of the article (PDF p. 2: title, authors, Freie Universität Berlin; received 12 March 1982, in final form 9 June 1982) on 2026-10-09. The numbers below were read on the rendered pages 3414, 3416 and 3420.

The paper is about the Xe2 g states (0g+(3P1), 1g(3P1), 1g(3P2)); Xe2 is not a material of optmat, so its molecular results are not taken (band positions 67 450-69 000 cm^-1, the polarisation ratios Gamma_c / Gamma_p = 0.4, 1.50(20) and 1.45(20), Figs. 1-5, the quoted excimer lifetimes (0u+ about 5 ns, 1u about 100 ns), the vibrational relaxation k = 7 x 10^-11 cm^3 s^-1 and the 1u -> 0u+ mixing 4.6 x 10^-15 cm^3 s^-1).

THE ATOMIC VALUES (p. 3414, 3416). ‘The weak single line at 67 073 cm^-1 shows a linear pressure dependence. Within the experimental error it coincides with the atomic 3P2 level of Xe I at 67 068 cm^-1 (Moore 1958)’: the dipole-forbidden 5p6 1S0 -> 5p5 6s 3P2 two-photon transition (NIST 5p5(2P*3/2)6s 2[3/2]* J = 2, 67067.547 cm^-1). Its rate, from about one count per pulse at 50 Torr, ‘W(5p6 1S0; 5p5 6s 3P2) = 1 x 10^-2 s^-1’, ‘in error by a factor of three’; with W = sigma^(2) I / hbar omega and ‘alpha = sigma^(2) / I’, ‘alpha(5p6 1S0; 5p5 6s 3P2) = 2 x 10^-35 cm^4 W^-1’, ‘about seven orders of magnitude smaller than for typical dipole-allowed two-photon transitions to levels of the 5p5 6p configuration (Gornik et al 1981, Pindzola et al 1981)’.

TAKEN (inline, p. 3414): the line position, 67 073 cm^-1, as level_energy of 6s[3/2]2 (use = check: tuning accuracy ‘better than 10 cm^-1’, held as a bound; NIST 67067.547, 5.5 cm^-1 lower; Moore 67 068). The quoted three-body rate coefficient of the atomic 3P1 and 3P2 levels, ‘both atomic states decay via three-body collisions with an approximate rate constant of k3 = 5 x 10^-32 cm^6 s^-1 (e.g. Bonifield et al 1980), forming higher vibrational 0u+(3P1) and 1u, 0u-(3P2) states’ (p. 3420), as collisional_quenching_rate_coefficient (order 3, perturber self; use = check, assumed = true: a quoted model input of the relaxation scheme, Fig. 6).

NOT TAKEN (no quantity): alpha = 2 x 10^-35 cm^4 W^-1 and W = 10^-2 s^-1 for 6s[3/2]2. alpha is the rate per atom times hbar omega / I^2 at the 25 GHz laser’s line centre, a linewidth-dependent peak coefficient, not the frequency-integrated two_photon_excitation_cross_section; the paper states no line shape (its Ref. gornik_1981 does: a Gaussian with Delta omega^2 = 2 Delta omega_L^2 + Delta omega_D^2), and the transition is not one of TC-952’s dipole-allowed levels. Checked: alpha I^2 / hbar omega at 20 MW cm^-2 and 298.2 nm (half of 67 073 cm^-1) is 1.2 x 10^-2 s^-1, the printed W.

FINDINGS (held records, for Q1 of OEP 8). gornik_1981 (TC-922): its measured 6p rates, 3.2 x 10^4 (6p[1/2]0) and 3.5 x 10^3 s^-1 (6p[3/2]2) at 1.8 MW/cm^2 and 2.8 GHz, are in this paper’s convention alpha = W hbar omega / I^2 = 7.9 x 10^-27 and 8.5 x 10^-28 cm^4 W^-1 (as gornik_1981’s notes compute for 6p[3/2]2), 4 x 10^8 and 4 x 10^7 times this paper’s 2 x 10^-35: ‘about seven orders’ holds for 6p[3/2]2 (the bandwidths differ, 2.8 against 25 GHz, which alone moves the peak coefficient by about 9). No 6p[1/2]0 strength is given.

TWO-PHOTON DATA CITED: M. S. Pindzola, M. G. Payne and W. R. Garrett, Phys. Rev. A 24, 3115 (1981) (Xe 6p two-photon strengths), held as pindzola_1981b. NOT IN THE LIBRARY: W. M. McClain, J. Chem. Phys. 55, 2789 (1971) and D. L. Andrews and W. A. Ghoul, J. Chem. Phys. 75, 530 (1981) (polarisation ratios); T. D. Bonifield et al., J. Chem. Phys. 72, 2914 (1980) (Xe excimer kinetics, the k3 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

gornik_1982/level_6s32_2

{
  "id": "level_6s32_2",
  "material": "Xe",
  "table": "text",
  "quantity": "level_energy",
  "unit": "cm-1",
  "abscissa": "label",
  "use": "check",
  "uncertainty": {
    "column": true,
    "level": "bound"
  },
  "parameters": {
    "configuration": "5p5.(2P*<3/2>).6s",
    "term": "2[3/2]*",
    "j": "2",
    "method": "two-photon excitation spectrum (frequency-doubled dye laser, 25 GHz), VUV fluorescence; the laser calibrated by a monochromator on atomic lines"
  }
}

1 inline points in the source record.

p. 3414: ‘The weak single line at 67 073 cm^-1’, the dipole-forbidden two-photon 5p6 1S0 -> 5p5 6s 3P2 line (NIST 5p5(2P*3/2)6s 2[3/2]* J = 2, 67067.547 cm^-1), at 50-500 Torr; ‘The accuracy of the dye laser tuning was better than 10 cm^-1 on the two-photon scale’ (p. 3414), held as a bound. A check: NIST is 5.5 cm^-1 lower, within the bound.

gornik_1982/k3_self_Xe

{
  "id": "k3_self_Xe",
  "material": "Xe",
  "table": "text",
  "quantity": "collisional_quenching_rate_coefficient",
  "unit": "cm6/s",
  "scale": 1e-32,
  "abscissa": "label",
  "use": "check",
  "reproduced_from": [
    "T. D. Bonifield, F. H. K. Rambow, G. K. Walters, M. V. McCusker, D. C. Lorents and R. A. Gutcheck, J. Chem. Phys. 72, 2914 (1980)"
  ],
  "uncertainty": {
    "level": "not stated"
  },
  "parameters": {
    "perturber": "self",
    "order": 3,
    "channel": "Xe2* excimer formation (0u+(3P1) from 3P1; 1u, 0u-(3P2) from 3P2)",
    "assumed": true,
    "method": "quoted from Bonifield et al. (1980) as approximate"
  }
}

2 inline points in the source record.

p. 3420: ‘both atomic states decay via three-body collisions with an approximate rate constant of k3 = 5 x 10^-32 cm^6 s^-1 (e.g. Bonifield et al 1980)’, one value for both 3P1 (NIST 5p5(2P*3/2)6s 2[3/2]* J = 1, 68045.156 cm^-1) and 3P2 (J = 2, 67067.547), forming 0u+(3P1) and 1u, 0u-(3P2) excimers respectively; a quoted, approximate model input of the relaxation scheme (Fig. 6), 50-500 Torr, room temperature.

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.