MEASUREMENT OF ROTATIONAL STATE-TO-STATE RELAXATION COEFFICIENTS BY RAMAN-RAMAN DOUBLE RESONANCE. APPLICATION TO SELF-COLLISIONS IN ACETYLENE.

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Title: MEASUREMENT OF ROTATIONAL STATE-TO-STATE RELAXATION COEFFICIENTS BY RAMAN-RAMAN DOUBLE RESONANCE. APPLICATION TO SELF-COLLISIONS IN ACETYLENE.
Creators: Domenech, J. L.; Martinez, R. Z.; Bermejo, D.
Issue Date: 2009
Publisher: Ohio State University
Abstract: We have developed a technique for the measurement of state-to-state rotational relaxation rates due to collisions in the gas phase. A single J state of the $v_{2}=1$ vibrational level of acetylene is populated by a Stimulated Raman process. After a variable delay of a few ns we record high resolution ($\sim$ 0.003 cm$^{-1}$) spectra of the Q-branch of the $v_{2}=2\leftarrow v$_{2}=1$ transition by a second Stimulated Raman process. The relative intensities of the lines of this Q-branch, recorded as a function of the the initially pumped J level and the number of collisions between the pump and probe stages (delay $\times$ pressure product), allows us to obtain a set of state-to-state energy transfer coefficients by fitting the evolution of the observed populations to that predicted by a master equation with adjustable coefficients. The experimental details and first results for odd-J levels of acetylene at 150 K will be presented.
Description: Author Institution: Instituto de Estructura de la Materia (CSIC), Serrano 123, E-28006 Madrid, SPAIN
URI: http://hdl.handle.net/1811/38279
Other Identifiers: 2009-WG-11
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