Dissociative recombination of H/sup +//sub 2/, HD/sup +/, and D/sup +//sub 2/ by collisions with slow electrons

Journal Article · Thu Jan 15 00:00:00 EST 1987 · J. Chem. Phys.; (United States)

OSTI ID:6699122

Nakashima, K; Takagi, H; Nakamura, H

Using the multichannel quantum defect theory (MQDT), dissociative recombination of H/sup +//sub 2/, HD/sup +/, and D/sup +//sub 2/ via the two-electron excited superexcited state /sup 1/..sigma../sub g/(2psigma/sub u/)/sup 2/ is studied for each specified initial vibrational state v/sub i/ (approx. <4) of molecular ions at low electron energies 0.02approx. <1.0 eV. The necessary basic physical quantities, electronic coupling V(R) and quantum defect as a function of internuclear distance R, are obtained from our previous scattering calculations. As a by-product we have also obtained the singlet scattering d-wave partial cross sections for the various vibrational transitions of molecular ions by electron impact. It is found that the Franck--Condon like factor between vibrational state and dissociative continuum is most decisive in characterizing the overall magnitude and energy dependence of the cross sections. Even the vibrational transitions occur predominantly via the dissociative superexcited state. This suggests that the preionization mechanism of the states of the /sup 1/..sigma../sub g/ symmetry is very different from that of /sup 1/..sigma../sub u/ and /sup 1/Pi/sub u/ in the vicinity of ionization threshold.

• Research Organization: Division of Theoretical Studies, Institute for Molecular Science, Myodaiji, Okazaki 444, Japan and Department of Molecular Science and Technology, Kyusyu University, Hakozaki, Fukuoka 812, Japan
• OSTI ID: 6699122
• Journal Information: J. Chem. Phys.; (United States), Vol. 86:2
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
DEUTERIUM IONS
ELECTRON-ION COLLISIONS
DISSOCIATION
RECOMBINATION
HYDROGEN DEUTERIDE
HYDROGEN IONS
CROSS SECTIONS
MOLECULAR IONS
CHARGED PARTICLES
COLLISIONS
DEUTERIDES
DEUTERIUM COMPOUNDS
ELECTRON COLLISIONS
HYDROGEN COMPOUNDS
ION COLLISIONS
IONS
640304* - Atomic
Molecular &amp; Chemical Physics- Collision Phenomena