COHERENT ANTI-STOKES RAMAN-SPECTROSCOPY STUDIES OF NITRIC-OXIDE
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Coherent anti-Stokes Raman spectroscopy (CARS) of the Q branch of NO has been performed with a resolution of 0.05 cm-1 by means of a pulsed-dye-laser system. The two Q-branch series originating from the II1/22 and II3/22 electronic states could be resolved for higher J values. CARS measurements were performed for various gas pressures in order to study the pressure dependence of the real and imaginary parts of the third-order nonlinear susceptibility (13). Observed CARS spectra at a pressure of 1.33 104 Pa allowed the determination of the ratio of the differential Raman-scattering cross sections for the two electronic states as (dd) 12:(dd) 32=1.01 0.02. 1981 The American Physical Society.