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Determination of the absolute Raman cross section of methyl

✍ Scribed by S. Hädrich; S. Hefter; B. Pfelzer; T. Doerk; P. Jauernik; J. Uhlenbusch

Publisher
Elsevier Science
Year
1996
Tongue
English
Weight
278 KB
Volume
256
Category
Article
ISSN
0009-2614

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✦ Synopsis

Methyl (CH 3) is generated by photodissociation of methyliodide (CH3I) applying an excimer laser operating at 248 nm. The ca 3 is detected using coherent anti-Stokes Raman spectroscopy (CARS). The CH 3 density is deduced by monitoring simultaneously the reduction of the CARS signal of the parent molecule CH 3 I. CARS spectra of CH 3 (1/' = 3005 cm-I) are recorded and the rotational temperature is evaluated. The CARS signal intensities are compared with those of deuterium and methane in order to obtain an absolute calibration of the Raman cross section. The measurements yield a Raman cross section of do/dO = 7 × 10 -31 cmE/sr at Ap = 532 nm.

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