CCl+ (A1Π–X1Σ+, a3Π1–X1Σ+) emission systems produced from the thermal energy reaction between He+ and CCl4
- 1 June 1983
- journal article
- Published by Canadian Science Publishing in Canadian Journal of Physics
- Vol. 61 (6) , 838-843
- https://doi.org/10.1139/p83-103
Abstract
Two emission systems of CCl+ have been observed by the dissociative charge-transfer reaction of He+ with CCl4 in the 230–255 and 390–405 nm region. The former system had been detected from an electronic discharge in CCl4 vapor, though the electronic transition had not been known definitely. On the other hand, the latter system was observed for the first time in this work. By comparison with spectroscopic constants obtained by ab initio calculations, the 230–255 and 390–405 nm bands were assigned to the A1Π–X1Σ+ and a3Π1–X1Σ+ systems, respectively. From the vibrational analysis of the a−X system, the following spectroscopic constants have been determined for the new state (in cm−1):a3Π,:Te = 25 480.6 ± 1.5; ωe = 1120.3 ± 1.0; ωexe = 7.52 ± 0.14. The mechanism of charge-transfer ionization leading to the CCl+ (A, a) states was discussed in comparison with that of electron-impact ionization.Keywords
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