Abstract
An apparatus combining the cross-beam and threshold-ionization techniques has been used to measure absolute cross sections for electron impact dissociation of ${\mathrm{CH}}_{4}$ molecules into the ${\mathrm{CH}}_{3}$ neutral radicals at energies from threshold up to $13\phantom{\rule{0.3em}{0ex}}\mathrm{eV}$. The threshold energy for the lowest-lying $^{3}T_{2}$ state has been observed to be $7.5\phantom{\rule{0.3em}{0ex}}\ifmmode\pm\else\textpm\fi{}0.3\phantom{\rule{0.3em}{0ex}}\mathrm{eV}$, and attributed to neutral ${\mathrm{CH}}_{3}$ formation. Peaks have been observed at $\ensuremath{\sim}9.6$ and $11.5\phantom{\rule{0.3em}{0ex}}\mathrm{eV}$, in agreement with electronic excitation and photon impact neutral dissociation literature data. The current results indicate that all excited states of ${\mathrm{CH}}_{4}$ predominantly result in dissociation via the ${\mathrm{CH}}_{3}$ neutral radical channel below $12.5\phantom{\rule{0.3em}{0ex}}\mathrm{eV}$.
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