High resolution Raman spectroscopy from vibrationally excited states populated by a stimulated Raman process: 2 nu(2)-nu(2) of (C2H2)-C-12 and (C2H2)-C-13

Year: 1998

Authors: Bermejo D., Cancio P., Di Lonardo G, Fusina L.

Autors Affiliation: Instituto de Estructura de la Materia, Consejo Superior de Investigaciones Cientificas, Madrid, Spain;
Dipartimento di Chimica Fisica e Inorganica, Università di Bologna

Abstract: A generalization of a previously reported technique for investigating vibrationally excited states via high resolution Raman spectroscopy is proposed. In a first step, a vibrational state, typically not accessible by a dipole moment transition from the ground state, is populated in a pulsed stimulated Raman process. After a delay of several nanoseconds, a high resolution spectrum corresponding to transitions from this long Lived state is recorded following a quasi-cw stimulated Raman spectroscopy scheme. The use of a pulsed dye laser for providing one of the pumping radiations overcomes some of the limitations of the previously proposed scheme, where this radiation was generated by a Raman shifter filled at relatively high pressure with the gas under study. Experimental aspects are discussed and the spectra of the Q branches of 2 nu(2)(Sigma(g)(+))-nu(2)(Sigma(g)(+)) of (C2H2)-C-12 and (C2H2)-C-13 are presented. The analysis of the measured transitions yielded accurate values of the spectroscopic parameters for the upsilon(2)=2 vibrationally excited state for both isotopomers and improved values of the corresponding anharmonicity constants x(22)(0) are derived. (C) 1998 American Institute of Physics.

Journal/Review: JOURNAL OF CHEMICAL PHYSICS

Volume: 108 (17)      Pages from: 7224  to: 7228

KeyWords: Stimulated Raman; Molecular Spectroscopy;
DOI: 10.1063/1.476140

Citations: 21
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