gordon_1993#
R. J. Gordon, S.-P. Lu, S. M. Park, K. Trentelman, Y. Xie, L. Zhu, A. Kumar and W. J. Meath, J. Chem. Phys. 98, 9481 (1993)
Source record · Catalogue · Review register
DOI: 10.1063/1.464379
Source kind: measurement
Recorded technique: Coherent phase control of 3+1 (and 1+1) resonance-enhanced multiphoton ionization of HCl or CO: the UV beam (lambda_1) and its third harmonic (lambda_3, generated in Kr) pass through a 45-50 cm tuning cell of H2 or Ar at 1-6 Torr; the ion signal is modulated as the pressure changes the phase difference, and the modulation period Delta P gives n_3 - n_1 (Eqs. (2), (5)).
Materials in structured entries: Ar, H2
Dataset quantities: refractivity
Contents: 8 datasets; 0 formulas.
Curation notes#
The measurement gives the difference n_3 - n_1 between the VUV and UV refractivities; n_3 is obtained by adding n_1 calculated from constrained dipole oscillator-strength distributions: Kumar and Meath’s for argon (constrained to Coulon et al.’s refractivities at 6329.9 and 4766.2 A), Zeiss et al.’s for H2 (constrained to Smith et al.’s at 2632.1 and 1679.7 A), ‘accurate to a few tenths of a percent’ away from the absorption threshold (p. 4). The experimental values therefore depend on that calculated UV value, which is small beside the VUV one (about 3 x 10^-4 at 3300-3450 A for Ar against 6-8 x 10^-4 at 1110-1150 A), so a few-tenths-percent error in it moves n_3 - 1 by well under the stated +-6-8 %. Values at STP (1 atm, 0 degrees C) with N / N_0 = (P/P_0)(T_0/T) (Eq. (5)): an ideal-gas density. Error bars ‘are single standard deviations’ (Fig. 6 caption). Wavelengths are vacuum wavelengths.
The ‘theory’ columns are the DOSD calculations (the Kumar-Meath argon DOSD is one of this paper’s authors’ own), kept as checks. Table II’s values lie among the B-X (0-0) rotational lines of H2 (Table III: R(0) 1108.13, R(1) 1108.63, P(1) 1110.06, R(2) 1110.12 A), where n - 1 has anomalous dispersion; the paper models them with individual lines, Doppler-broadened (Eqs. (7)-(9), Fig. 5); they are not for a smooth dispersion model. Table III (line positions from Wilkinson) is not extracted.
The text (p. 5) also quotes Chashchina et al.’s argon value at 1216 A, (n - 1) x 10^4 = 5.016, ‘in good agreement with the present calculation of 5.12’, Gill et al.’s 5.65 (‘much too high’) and, for H2 at 1216 A, Gill et al.’s 3.20 against the calculated 3.24. The library holds a second, identical extraction of this paper (Gordon_1993_UseCoherentPhase_81bd3b); this record uses the first.
Recorded bibliographic identity status: VALIDATED_WITH_WARNINGS. This concerns identification of the source; it does not establish the scientific correctness of its contents.
Datasets#
gordon_1993/experiment_Ar#
{
"id": "experiment_Ar",
"material": "Ar",
"file": "Ar/gordon_1993__experiment_Ar.csv",
"table": "tbl_d009cc88bfad",
"quantity": "refractivity",
"scale": 0.0001,
"abscissa_unit": "angstrom",
"wavelength_medium": "vacuum",
"state": "1atm_0C",
"density": "ideal",
"use": "primary",
"uncertainty": {
"column": true,
"level": "1 sigma"
}
}
Table I, argon, n_3 - 1 at 1109.45-1150.32 A (+-6-8 %), with n_1 - 1 at lambda_1 = 3 lambda_3 from Kumar and Meath’s DOSD.
gordon_1993/theory_Ar#
{
"id": "theory_Ar",
"material": "Ar",
"file": "Ar/gordon_1993__theory_Ar.csv",
"table": "tbl_d009cc88bfad",
"quantity": "refractivity",
"scale": 0.0001,
"abscissa_unit": "angstrom",
"wavelength_medium": "vacuum",
"state": "1atm_0C",
"density": "ideal",
"use": "check"
}
Table I, ‘Theory’: n_3 - 1 from Kumar and Meath’s constrained argon DOSD (Eq. (6)).
gordon_1993/experiment_H2#
{
"id": "experiment_H2",
"material": "H2",
"file": "H2/gordon_1993__experiment_H2.csv",
"table": "tbl_d009cc88bfad",
"quantity": "refractivity",
"scale": 0.0001,
"abscissa_unit": "angstrom",
"wavelength_medium": "vacuum",
"state": "1atm_0C",
"density": "ideal",
"use": "primary",
"uncertainty": {
"column": true,
"level": "1 sigma"
}
}
Table I, H2, n_3 - 1 at 1119.65, 1127.85 and 1150.32 A, away from the B-X (0-0) band (origin 1108.61 A), with n_1 from Zeiss et al.’s DOSD. The 1109.45 A H2 row (‘see Table II’) is in anomalous_H2.
gordon_1993/theory_H2#
{
"id": "theory_H2",
"material": "H2",
"file": "H2/gordon_1993__theory_H2.csv",
"table": "tbl_d009cc88bfad",
"quantity": "refractivity",
"scale": 0.0001,
"abscissa_unit": "angstrom",
"wavelength_medium": "vacuum",
"state": "1atm_0C",
"density": "ideal",
"use": "check"
}
Table I, ‘Theory’: n_3 - 1 from Zeiss et al.’s constrained H2 DOSD.
gordon_1993/anomalous_H2#
{
"id": "anomalous_H2",
"material": "H2",
"file": "H2/gordon_1993__anomalous_H2.csv",
"table": "tbl_c084e004c082",
"quantity": "refractivity",
"scale": 0.0001,
"abscissa_unit": "angstrom",
"wavelength_medium": "vacuum",
"state": "1atm_0C",
"density": "ideal",
"use": "check",
"uncertainty": {
"column": true,
"level": "1 sigma"
}
}
Table II, H2 n_3 - 1 at eight HCl rotational lines 1107.593-1110.223 A, among the H2 B-X (0-0) lines (anomalous dispersion: 2.0 to 9.2 x 10^-4 within 3 A); R(4) and R(2) of HCl gave no or irreproducible modulation (footnote a) and have no value. For comparison with a rotationally resolved model (the paper’s Eqs. (7)-(8)), not for a smooth fit. The +- are single standard deviations.
gordon_1993/chashchina_1968_Ar#
{
"id": "chashchina_1968_Ar",
"material": "Ar",
"table": "text",
"quantity": "refractivity",
"scale": 0.0001,
"abscissa_unit": "angstrom",
"wavelength_medium": "vacuum",
"state": "1atm_0C",
"density": "unknown",
"use": "reproduced",
"reproduced_from": [
"G. I. Chashchina, V. I. Gladushchak and E. Ya. Shreider, Opt. Spectrosc. 24, 542 (1968)"
]
}
1 inline points in the source record.
p. 5: ‘At 1216 A Chashchina et al. obtained a value of (n - 1) x 10^4 = 5.016’. A value of their smoothing Sellmeier formula; the original is not in the library.
gordon_1993/theory_1216#
{
"id": "theory_1216",
"material": "Ar",
"table": "text",
"quantity": "refractivity",
"scale": 0.0001,
"abscissa_unit": "angstrom",
"wavelength_medium": "vacuum",
"state": "1atm_0C",
"density": "ideal",
"use": "check"
}
1 inline points in the source record.
p. 5: ‘the present calculation of 5.12’ (Kumar and Meath’s argon DOSD) at 1216 A.
gordon_1993/theory_1216_H2#
{
"id": "theory_1216_H2",
"material": "H2",
"table": "text",
"quantity": "refractivity",
"scale": 0.0001,
"abscissa_unit": "angstrom",
"wavelength_medium": "vacuum",
"state": "1atm_0C",
"density": "ideal",
"use": "check"
}
1 inline points in the source record.
p. 5: ‘our calculated value of 3.24’ for H2 at 1216 A (Zeiss et al.’s DOSD).
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.