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• W1969132774 endingPage "2196" @default.
• W1969132774 startingPage "2180" @default.
• W1969132774 abstract "Dissociative excitation of molecular hydrogen can proceed via the process ${mathrm{H}}_{2}+eensuremath{rightarrow}mathrm{H}(2s)+mathrm{H}+e$ and yield metastable $mathrm{H}(2s)$ atoms that have kinetic energies near 0.3 eV (slow) or near 4 eV (fast). The dissociation process has been studied using a pulsed electron gun with an energy resolution of ifmmodepmelsetextpmfi{} 0.3 eV and using a metastable atom detector capable of viewing $mathrm{H}(2s)$ atoms with an angular resolution of 1ifmmode^circelsetextdegreefi{} over a range 60ifmmode^circelsetextdegreefi{}-120ifmmode^circelsetextdegreefi{} with respect to the electronbeam direction. The measurement of the angular intensity distribution gives information about the final states that are involved in the dissociation process. (i) For slow $mathrm{H}(2s)$ atoms, the electron energy threshold for production of the least energetic of the slow metastable atoms is 14.6 ifmmodepmelsetextpmfi{}0.3 eV. The excitation function and the angular distribution of the slow $mathrm{H}(2s)$ atoms suggest that the ${B}^{ensuremath{'}}^{1}ensuremath{Sigma}_{u}^{+}$, $e^{3}ensuremath{Sigma}_{u}^{+}$, $D^{1}ensuremath{Pi}_{u}^{+}$, and $d^{3}ensuremath{Pi}_{u}^{+}$ excited states are involved in the formation of these metastable fragments. (ii) For fast $mathrm{H}(2s)$ atoms, the electron energy threshold for production of the least energetic of the fast $mathrm{H}(2s)$ atoms is near 29 eV. The angular distribution data would indicate that these atoms arise from a ${ensuremath{Pi}}_{u}$ state; the form of the excitation function indicates that the parent state has a multiplicity of 1. The change in energy distribution of the fast $mathrm{H}(2s)$ atoms, measured as a function of electron-gun voltage, supports the view that the $^{1}ensuremath{Pi}_{u}$ state is a previously unreported doubly excited state that has an asymptotic energy of 24.9 eV." @default.
• W1969132774 created "2016-06-24" @default.
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• W1969132774 date "1972-12-01" @default.
• W1969132774 modified "2023-09-26" @default.
• W1969132774 title "Dissociative Excitation of Molecular Hydrogen by Electron Impact" @default.
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• W1969132774 doi "https://doi.org/10.1103/physreva.6.2180" @default.
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