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Third harmonic interference effects in the mpi spectrum of acetylene

✍ Scribed by Thomas M. Orlando; Leping Li; Scott L. Anderson; Michael G. White

Publisher: Elsevier Science
Year: 1986
Tongue: English
Weight: 417 KB
Volume: 129
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(86)80163-4

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✦ Synopsis

We report a study of the 3 + 1 hiPI spectrum of acetylene in the 74450-90100 cm-' energy range. Many Rydberg and some valence states are observed, most of which are stable on the time scale of the experiment. Only in a region with high density of valence states is there evidence for non-radiative decay. We also report non-linear optical processes in &Hz, particularly third-harmonic generation (THG). At pressures above a few Torr, THG effectively quenches the MPI signal for all states of the correct symmetry. This observation explains the absence of most Rydberg structure in a previous 3 + 1 MPI study of CzHZ, and demonstrates the need to work at very low densities.

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