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Broadband N2 and N2O cars spectra from a CH4/N2O flame

✍ Scribed by L.E. Harris

Publisher
Elsevier Science
Year
1982
Tongue
English
Weight
450 KB
Volume
93
Category
Article
ISSN
0009-2614

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✦ Synopsis

Broadband CARS spccw of N2 .tnd N20 b.tvc been obtdmcd from the rutton zone 2nd Urn pobt.lhms gtu!a of a 1r.m CH4/N20 Il>mc urmg ~bc non-plannr BOXCARS tccbmque Tbc tcmpcmturc tmd conccntr.ttmn of N2 .md tbc Lonccotr~uon or N20 wcr(: cstlmatcd lrom the CARS spcctrJ wtll the ald of model ~lcul~rw~ The trmperaturc .~nd conccntr~tmn profilcs obtomcd allow tnstghl mto the clcmcwtry pronsscs occurnng m the lldmc I. introduction Recently, coherent anti-Stokes Raman scattering (CARS) spectroscopy has undergone several modifications to enhance its usefulness for mvestigating flames. CARS can arise from the non-hnear response of homogeneous media. The nor&near response of a homogeneous medium upon wluch waves o, and w2 are incident generatesan oscillating polarization. The lowest-order non-linearity is the third-order susceptl-biJity, x(~)(-,~, wl, wl, -q) which generates a fre. quency component of the polarization at w3 = 2w, -w2 by the process termed three-wave mviing [ I]. Resonant enhancement of three-wave mixing occurs ifw, -w, 1s made equal to a Raman-actwe wbntion. wVr in which case the enhancement of the signal u3 is termed a CARS process [2j. Smce CARS is a coherent process, w3 is maxunized d the wavevectors, k,, are phase matched such that 2k, = k, + k, where k, equals w,r+/c, where c is the speed oflight, and TV,

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