The low-lying bending vibrational levels of the CCH (X̃ 2Σ+) radical studied by laser-induced fluorescence

Yen Chu Hsu, Jim Min Lin, D. Papoušek, Jaw Jer Tsai

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Abstract

The uv spectrum of the CCH radical was recorded using the laser-induced fluorescence technique on the 193 nm photolysis product of acetylene. Four 2Π-2Π bands at 38 805, 37 946, 37 010, and 36 075 cm-1 of CCH were rotationally analyzed and assigned as transitions from the (0,υ2 1,0) (υ2=1, 3, 5, 7) vibrational levels of the X̃ 2Π+ state to a common upper vibronic state (denoted as U), which possibly belongs to the 2 2Π state. A simultaneous nonlinear least squares fit of the uv bands, in combination with the infrared transitions previously observed in the X̃ 2Σ+ state, provided improved spectroscopic parameters for the U state and the (0,31,0), (0,51,0), and (0,71,0) levels of the X̃ state.

Original languageEnglish
Pages (from-to)6690-6696
Number of pages7
JournalJournal of Chemical Physics
Volume98
Issue number9
DOIs
StatePublished - 1993

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