farrow_1987#

R. L. Farrow, R. P. Lucht and L. A. Rahn, J. Opt. Soc. Am. B 4, 1241 (1987)

Source record · Catalogue · Review register

Source kind: measurement

Recorded technique: Scanned, polarization-analyzed CARS with a single-mode frequency-doubled Nd:YAG pump (532 nm, < 50 MHz) and a dye-laser Stokes (1.1 GHz) on binary mixtures of about 5 % N2 in propane and n-butane (cell, 0.4-1 atm, 297 K) and in the post-flame gases of an H2-O2-N2 flame (1570 K, water vapour); the N2 Q-branch resonant susceptibility (modified exponential-gap linewidth model fitted to inverse-Raman linewidths, Schrotter and Klockner’s cross section, curated as schrotter_1979) is the calibration standard.

Materials in structured entries: N2

Dataset quantities: nonlinear_susceptibility

Contents: 1 dataset; 0 formulas.

Curation notes#

Nonresonant CARS susceptibilities of propane, n-butane and water vapour, none of them curated species: their values (Table 2, 10^-18 (cm^3/erg)/amagat: effective chi_nr C3H8 98 +- 12, n-C4H10 122 +- 15; electronic C3H8 80 +- 12, n-C4H10 100 +- 12, H2O 18.5 +- 2 (per atm at 273 K); off-resonant Raman 3 chi_1111,buf C3H8 18 +- 4, n-C4H10 22 +- 8) are not extracted. The only curated entry is N2’s reference value, 8.5 +- 2 x 10^-18 (cm^3/erg)/amagat, taken from Farrow and Rahn 1985 (Ref. 9, farrow_1985).

Definitions (p. 1241): ‘In general 3 chi(3) = 3 chi_r + chi_nr’ (so chi_nr is three times a chi_1111 in the paper’s normalization of the resonant term); Eq. (1): 3 chi_1111(3)(w) = (N/hbar) alpha . G^-1 . p . alpha, with N the number density per amagat and alpha_j = (c^2/w_1^2)(d sigma/d Omega)_j^1/2; Eq. (6): the anti-Stokes intensity |3 chi_1111,N2 Phi(rho_N2) + 3 chi_1111,buf Phi(rho_buf) + chi_nr,N2 Phi(1/3) + chi_nr,buf Phi(1/3)|^2, Phi(rho) = cos theta cos phi + rho sin theta sin phi (Eq. (7)). The chi_nr are thus the same CARS-literature quantity as farrow_1985’s (chi^CARS per amagat, gamma_T = 2 chi_nr/N0). The abstract and the water section quote N2’s 8.5 x 10^-18 once per amagat and once ‘(cm^3/erg)/atm’ (p. 1244): an inconsistency of units in the text. Stated accuracy of the present results ‘~+-12 %’ (p. 1244).

Recorded bibliographic identity status: VALIDATED_WITH_WARNINGS. This concerns identification of the source; it does not establish the scientific correctness of its contents.

Datasets#

farrow_1987/chi_nr_N2#

{
  "id": "chi_nr_N2",
  "material": "N2",
  "file": "N2/farrow_1987__chi_nr_N2.csv",
  "table": "tbl_4c51c969c816",
  "quantity": "nonlinear_susceptibility",
  "unit": "cm3/(erg amagat)",
  "scale": 1e-18,
  "abscissa_unit": "nm",
  "use": "reproduced",
  "reproduced_from": [
    "farrow_1985"
  ],
  "uncertainty": {
    "column": true,
    "level": "not stated"
  },
  "parameters": {
    "process": "cars",
    "convention": "chi_cars_per_amagat",
    "part": "electronic"
  }
}

Table 2 (p. 1245), ‘Electronic chi_nr(3)’ of N2, 8.5 +- 2 x 10^-18 (cm^3/erg)/amagat, note c: ‘Ref. 9’ (Farrow and Rahn 1985, whose Table 2 prints 8.5 +- 1.3 and whose text 8.5 +- 0.9; here +- 2). The calibration value of this paper’s ratios (abstract: propane, n-butane and water 11.5 +- 1.4, 14.4 +- 1.8 and 2.2 +- 0.3 times N2). CARS at a 532 nm pump, per amagat (no state).

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.