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

Brian J. Orr, John G. Haub

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)


A time-resolved infrared-ultraviolet double-resonance technique is used to characterize specific rovibrationa] states pumped by a pulsed CO2 laser within the v4 vibrational ladder of D2CO. The roles of rotational and quasiresonant 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.

Original languageEnglish
Pages (from-to)236-238
Number of pages3
JournalOptics Letters
Issue number5
Publication statusPublished - 1981
Externally publishedYes

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