Rovibrational Raman spectrum

Ethylene has no dipole moment and a center of symmetry and therefore the Raman spectrum is an important source of structural information. After the early work on the rotational (Dowling and Stoicheff, 1959) and rovibrational Raman spectrum (Feldman et ah, 1956) these spectra were thoroughly studied in a series of publications (Hills and Jones, 1975 Hills et ah, 1977 Foster et ah, 1977). Overtones and combination bands were measured in an intracavity Raman experiment by Knippers et ah (1985). The Q-branch of the U2 band was resolved by pulsed CARS spectroscopy in a molecular beam experiment (Byer et ah, 1981). 

The Raman spectrum of acetylene was the subject of many investigations [18,49,173-177] concentrating on the rotational spectrum and the Raman active fundamentals Vi, V2, and V4. Through recording of the second-order rovibrational Raman spectrum of C2H2, the anharmonicity constant X22, which had been predicted by Strey and Mills [178], could be determined by analyzing the combination band which overlaps with 21 2 [49]. The... 

WF Murphy. The rovibrational Raman spectrum of water vapour Vi and Mol Phys 36 727-732, 1978. 

G Millot, B Lavorel, G Fanjoux. Pressure broadening, shift, and interference effect for a multiplet line in the rovibrational anisotropic stimulated Raman spectrum of molecular oxygen. J Mol Spectrosc 176 211-218, 1996. 

Consider a time-resolved, electronically nonresonant CARS spectrum from a molecular liquid. In the CARS process, the laser pump pulses create a linear combination (that is the inteimolecular rovibrational coherence) of Raman active rovibrational transitions between molecules at position rr and r in the mixture. This stimulated Raman scattering process is carried out by two-coincident laser pulsesfl, II) with central frequenciesfwave vectors) C0i(k ) and (Oiiikii). By applying the third pulse with C0 (kni) to the liquid after time delay t, the time dependence of the inteimolecular rovibrational coherence is detected through the measurement of the intensity of the scattered photon with kj... 

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