The dissociative ionization of carbon monoxide

Abstract

The dissociative ionization of CO by low energy electron impact into C + + O (or O -) and O + + C (or C -) is investigated using ion energy and mass analysis. The kinetic energy distributions are studied as a function of the impinging electron energy. The threshold energies of C + and O + are measured as a function of the released kinetic energy. The formation of the products in their ground level and with a small amount of kinetic energy mainly occurs through predissociation. The CO + electronic states involved in these processes are tentatively identified. New evidences have been found for the importance of dissociative ionization via autoionization.

Synchrotron radiation induced photoionization and photodissociation of carbon monoxide in the 14–35 eV region

“…The first threshold for C + fragment formation from CO appears at 593/k and it is associated with the production of C + (2pO) + O-(2p) ion-pairs. The C+/CO mass spectrum has been studied earlier [19,20] but no analysis was reported. The associated O-/CO spectrum has also been measured and analyzed [18] as discussed in Sect.…”

Dipolar dissociation dynamics in electron collisions with carbon monoxide

“…To quantify the above conclusion, a detailed theoretical calculation of the potential energy curve and the underlying dynamics within this energy region is absolutely needed. There exist potential energy curves 29 for both S and P states in the energy range of our studies and high level ab initio potential energy curve calculations 30 of the P symmetry of Rydberg states of CO in the energy range that is lower in energy. The main emphasis of the paper 30 was to correctly interpret the experimental observation 31 on the predissociation of Rydberg W 1 P of the CO molecule.…”

Chemi-ionization reactions involving metastable helium atoms at high energy

“…[19]. The neutralization caesium cell has been described in detail elsewhere [15] The relative abundances of these three components were not measured in the present experiment, but from the data obtained by Reynaud et al [18] with a Cs cell the composition of the emerging helium neutral beam is well known in the 100-1000 eV range (see Table II Equation 12 shows that the N* metastable flux is obtainable from the product N* y* given by the Faraday cup so it is necessary to know y* in this energy range. The Faraday cup has an alkalinecontaminated stainless steel surface as a caesium flux from the caesium neutralization cell reaches and covers it (see Fig.…”

“…Locht et al [11], Locht [12] and Dehmer and Chupka [13] have shown that the autoionizing levels may play a considerable part in the dissociation of molecular ions such as N2+ and 02 . This can be written :…”