Optical excitation in collision of 500-5000 eV H2 + , He + , Ne + , Ar + , and N2 + ions with CO2
Abstract
Electronic excitation of the products of collisions of 500-5000 eV H2+, He+, Ne+, Ar+, and N2+ ions with CO2 has been investigated by a spectroscopic study of the optical emissions from the collision products at wavelengths from 3000 to 6500 Å. For H2+ and N2+ projectile ions,the most important contribution to the observed emissions was from the A 2Πu excited state of CO2+. For He+ and Ne+ impact, however, strong emissions from Oi, Oii, Ci, and Cii in high Rydberg states produced by dissociative ionization of CO2 were observed. Emission from excited molecular dissociation fragments (CO and CO+) was weak in the latter case, but it was possible to identify fluorescence definitely from the d 3Δi and a' 3Σ+ states of CO and the A 2Π state of CO+ as well as to identify tentatively emissions from the e 3Σ- and b 1Σ+ states of CO. Emissions from the projectile ions or fast neutral atoms produced by charge transfer were also observed. The most intense lines produced with He+, Ne+, and Ar+ projectiles originated from the neutral rare-gas atoms in Rydberg states as high as n=9. Analysis of the results shows that charge transfer, dissociative charge transfer, and direct excitation channels all contribute to the observed emissions, but the relative importance of the various channels is different for different projectile ions.
- Publication:
-
Journal of Chemical Physics
- Pub Date:
- April 1975
- DOI:
- 10.1063/1.430911
- Bibcode:
- 1975JChPh..62.3109B