Ã2Σ+g → X̃2Πu emission band system of dicyanoacetylene radical cation in the gaseous phase
1979; Elsevier BV; Volume: 60; Issue: 2 Linguagem: Inglês
10.1016/0009-2614(79)80013-5
ISSN1873-4448
AutoresJohn P. Maier, O. Marthaler, Fritz Thommen,
Tópico(s)Spectroscopy and Laser Applications
ResumoThe emission spectrum of the dicyanoacetylene radical cation has been observed in the 580–720 nm wavelength region as a result of low energy electron impact excitation in a crossed-beam arrangement. The band system is attributed to the Ã2Σ+g → X̃2Πu electronic transition by comparison with the photoelectron spectroscopic and calculated data on the states of dicyanoacetylene cation. The frequencies of the three Σ+g vibrational fundamentals in the ground cation state have been deduced from the emission spectrum. The lifetime of the lowest vibrational level of the Ã2Σ+g state of dicyanoacetylene cation was determined to be 13 ± 2 ns. Emission could not be detected from the corresponding states, Ã2Σ+, of fluorocyanoacetylene and cyanoacetylene cations, and these results are discussed.
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