Bibcode
Boudon, V.; Bermejo, D.; Martinez, R. Z.
Referencia bibliográfica
67th International Symposium on Molecular Spectroscopy, held 18-22 June, 2012 at Ohio State University. Abstract id. #RB06
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6
2012
Número de citas
0
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Descripción
The spectra of the ν_1, ν_2 and 2ν_2 bands were obtained with a
quasi-cw stimulated Raman spectrometer. In this technique, two laser
beams are focused simultaneously on the sample and their frequency
difference scanned, normally by scanning one of them. When this
difference matches a Raman transition of the molecule under study, an
energy transfer takes place between both beams, so that by monitoring
the intensity of one of them throughout a frequency scan a Raman
spectrum of the sample can be obtained. In a quasi-cw spectrometer one
of the laser beams is continuous and the other one pulsed, providing an
optimum compromise between resolution and sensitivity. The apparatus
function results from the convolution of the linewidths of the two
lasers. In our setup this function is dominated by the contribution of
the pulsed beam, resulting in a FWHM of ˜75 MHz, which sets the
limit to the resolution of the spectrometer. The three bands analyzed in
this work were studied at a temperature of 135 K. The spectrum of ν_1
was obtained at a sample pressure of 2 mbar. For the spectra of 2ν_2
and ν_2, which are much weaker, pressures of 15 and 20 mbar
respectively were used. The analysis has been performed thanks to the
XTDS and SPVIEW softwares developed in Dijon for such molecules.
Ch. Wenger, V. Boudon, M. Rotger, M. Sanzharov and J.-P. Champion, J.
Mol. Spectrosc., 251 102--113 (2008).