Fragment ion-photon coincidence (FIPCO) spectra by 120 eV electron impact on carbon dioxide (CO2) have been observed, in which optical emission in the 250-600 nm region has been detected. There are a dominant CO2+ peak and a weak, broad CO+ peak in the FIPCO spectra. The kinetic energy distribution of CO+ correlated with the CO+(A 2Π-X 2Σ+) emission has been estimated on the basis of the Monte Carlo simulation of the CO+ band shape. This CO+(A 2Π) ion is produced through the dissociation process, CO2 + e- → CO2+*[MET I 2Πu] + 2e- → CO+(A 2Π) + O(3P) + 2e-, where MET refers to multiple electron transitions. The production of CO+(B 2Σ+) is negligible compared with that of CO+(A 2Π). The produced CO+(A 2Π) ions is in vibrationally excited levels, and there is little population in the vibrational levels, v′ ≤ 3.
|ジャーナル||Journal of Physics B: Atomic, Molecular and Optical Physics|
|出版ステータス||出版済み - 7月 28 2002|
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