Abstract
Collision-induced dissociation (CID) of methane molecular ions with 2 ∼ 7 keV kinetic energy has been investigated as a function of collision gas (He and N 2) pressure using mass-analyzed ion kinetic energy spectrometry. The experimentally observed pressure dependence of the parent and daughter ion intensities has been analyzed using probability theory. Cross-sections for various collision-induced processes have been obtained. Even though the CID cross-section for CH 4 +· ions was larger with N 2 collision gas than with He, the CID yield was higher with He than with N 2 at a given value of the total attenuation of the parent ion intensity. This is explained in terms of the relative magnitudes of the cross-sections for various collision-induced processes. The shape of the collisional energy-deposition function has been estimated from the experimental data. Average collisional energy transfer has been found to be proportional to the square-root of the parent-ion kinetic energy.
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