Electron impact dissociation of molecular hydrogen and deuterium: Translational energy distribution of atomic hydrogen and deuterium (n = 3,4,5)
1982; Elsevier BV; Volume: 66; Issue: 3 Linguagem: Inglês
10.1016/0301-0104(82)88024-5
ISSN1873-4421
AutoresMorihide Higo, Satsuo Kamata, Teiichiro Ogawa,
Tópico(s)Mass Spectrometry Techniques and Applications
ResumoThe translational energy distributions of the excited hydrogen and deuterium atoms (n = 3,5) produced in e-H2 and e-D2 collisions have been obtained from an analysis of the Doppler line shapes of their Balmer lines. The distributions of H*(D*)(n = 3,5) are qualitatively identical with those of H*(D*)(n = 4) and consist of three major components; but, their relative intensities are different. Thus, it can be concluded that dissociative excitation of hydrogen leading to the formation of the hydrogen atom (n = 3,4,5) proceeds in similar processes. Important intermediate excited states are Rydberg states converging to the 2Σg+(1sσg) and 2Σu+(2pσu) states of H2+(D2+). The contribution of the low-lying doubly-excited Rydberg states also exists; however, this is smaller for the heavier atom and for the smaller principal quantum number. Comparison of translational energy distributions between H*(D*) (n = 3,4,5) and H+(D+) justifies an extension of the core-ion model of molecular dissociation for the formation of low-Rydber emissive atoms.
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