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Selective infrared excitation in D2CO: rotational assignments and the role of collisions

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Abstract

A time-resolved infrared-ultraviolet double-resonance technique is used to characterize specific rovibrational states pumped by a pulsed CO2 laser within the ν4 vibrational ladder of D2CO. The roles of rotational and quasi-resonant rovibrational relaxation, requiring, respectively, ≤1 and ~3 gas-kinetic collisions, are studied. The rotational specificity of the latter suggests that a collision-assisted sequence of infrared absorption steps is able to account for the selective initial stages of multiple-photon excitation in formaldehyde.

© 1981 Optical Society of America

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