farrow_1987
===========

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

`Source record <https://github.com/LupoLab/optmat/blob/main/src/optmat/data/sources/farrow_1987.toml>`__ · :doc:`Catalogue </the-data/sources>` · :doc:`Review register </register>`

DOI: `10\.1364/josab\.4\.001241 <https://doi.org/10.1364/josab.4.001241>`__

**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
~~~~~~~~~~~~~~~~~~~~~~~~

.. code-block:: text

   {
     "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 :doc:`review register </register>` for the checks and decisions.