Excitational dissociation of C2H2molecules by impact of He+and Ar+ions in the energy range 30-300 eV
- 14 August 1982
- journal article
- Published by IOP Publishing in Journal of Physics B: Atomic and Molecular Physics
- Vol. 15 (15), 2423-2437
- https://doi.org/10.1088/0022-3700/15/15/018
Abstract
Optical emission from electronically excited fragments, H, CH and CH+, was observed in collisions of He+ and Ar+ ions with C2H2 molecules in the energy range 30-300 eV. Emission from excited acetylene molecules or ions was not observed. Of these excited fragments, CH(B2 Sigma -) formed in He+ collisions and CH+(B1 Delta ) in He+ and Ar+ collisions show a linear dependence on the target pressure, indicating that they are produced in primary collision processes. On the other hand, CH(B2 Sigma -) formed in Ar+ collisions and CH(A2 Delta ) in He+ and Ar+ collisions show a quadratic dependence superimposed on a linear dependence on the target pressure. The pressure dependence of CH+(A1 Pi ) ions formed in He+ collisions shows a linear decrease, suggesting that a quenching process participates in the ion formation. Some reaction schemes are assumed in order to understand the ion production, using the basic concept that charge transfer between the projectile ion and the target is an essential process in the reactions.Keywords
This publication has 19 references indexed in Scilit:
- Photoionisation mass spectrometric study of acetylene in the VUV regionJournal of Physics B: Atomic and Molecular Physics, 1982
- Photoelectron spectra of acetylene with HeI, HeII, Zr Mζ, and Mg Kα radiation sourcesThe Journal of Chemical Physics, 1978
- Electron ionization spectroscopy of acetylene: Momentum distributions of valence orbitals and correlation effectsJournal of Electron Spectroscopy and Related Phenomena, 1977
- Experimental Oscillator Strengths of Molecular IonsThe Astrophysical Journal, 1977
- Emission spectra of Cl—CC—Cl+, Br—CC—Br+and I—CC—I+radical cations: Ã2Πg→X2Πuband systems and the decay of the Ã2ΠgstatesJournal of the Chemical Society, Faraday Transactions 2: Molecular and Chemical Physics, 1977
- Emission spectra of Cl—CC—H+, Br—CC—H+and I—CC—H+radical cations: Ã2Π→X2Π band systems and the decay of the Ã2Π statesJournal of the Chemical Society, Faraday Transactions 2: Molecular and Chemical Physics, 1977
- Near-Hartree-Fock assessment of reorganization effects in ionic states of acetyleneThe Journal of Chemical Physics, 1974
- Analysis of two band systems of CH+: 1△→1п and 3Σ→3пPhysica, 1969
- High resolution molecular photoelectron spectroscopy. III. Acetylenes and aza-acetylenesProceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences, 1968
- N° 30. — Sur les réactions d’ions positifs d’énergie comprise entre 0,5 et 1200 keV avec l’acétylèneJournal de Chimie Physique et de Physico-Chimie Biologique, 1968