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Rotationally resolved spectrum of the ν1 CH stretch of the propargyl radical (H2CCCH)

✍ Scribed by C.L. Morter; C. Domingo; S.K. Farhat; E. Cartwright; G.P. Glass; R.F. Curl

Publisher
Elsevier Science
Year
1992
Tongue
English
Weight
500 KB
Volume
195
Category
Article
ISSN
0009-2614

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✦ Synopsis

The vi acetylenic CH stretch of the propargyl radical (HCCCH2) near 3322 cm-' has been observed by infrared laser kinetic spectroscopy at Doppler limited resolution. Propargyl is prepared by flash photolysis of propargyl bromide or propargyl chloride at 193 nm and its transient infrared absorption probed by a cw color center laser. The spectrum consists, as is expected, of only atype (AK=O) transitions, and near the origin appears quite simple resembling that of a diatomic molecule. This means that the A and DK rotational constants in the upper state must differ little from the ground state so that the various K subbands overlap almost exactly. However, at Ng 14 the spectrum no longer has this regular pattern, probably because of perturbations of the excited state by nearby vibrational levels. Ground and excited state rotational constants were determined by fitting the K= 1 lines having N" < 14.

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