Physics – Atomic Physics
Scientific paper
Nov 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997stin...9921537m&link_type=abstract
Technical Report, California Univ. Davis, CA United States
Physics
Atomic Physics
Photodissociation, Infrared Spectroscopy, Spectral Emission, Radicals, Astronomical Spectroscopy, Acetylene, Acetone, Infrared Spectrometers, Excimer Lasers, Quenching (Atomic Physics)
Scientific paper
The photodissociation of acetylene and acetone was investigated as a function of added quenching gas pressures using step-scan time-resolved FTIR emission spectroscopy. Its main components consist of Bruker IFS88, step-scan Fourier Transform Infrared (FTIR) spectrometer coupled to a flow cell equipped with Welsh collection optics. Vibrationally excited C2H radicals were produced from the photodissociation of acetylene in the unfocused experiments. The infrared (IR) emission from these excited C2H radicals was investigated as a function of added argon pressure. Argon quenching rate constants for all C2H emission bands are of the order of 10-13cc/molecule.sec. Quenching of these radicals by acetylene is efficient, with a rate constant in the range of 10-11 cc/molecule.sec. The relative intensity of the different C2H emission bands did not change with the increasing argon or acetylene pressure. However, the overall IR emission intensity decreased, for example, by more than 50% when the argon partial pressure was raised from 0.2 to 2 Torr at fixed precursor pressure of 160mTorr. These observations provide evidence for the formation of a metastable C2H2 species, which are collisionally quenched by argon or acetylene. Problems encountered in the course of the experimental work are also described.
McLaren Ian A.
Wrobel Jacek D.
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