Dissociative attachment to rovibrationally excited H2

Details Dissociative attachment to rovibrationally excited H2 Dissociative attachment to rovibrationally excited H2

Jan 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984phrva..29..106w&link_type=abstract

Physical Review A - General Physics, 3rd Series (ISSN 0556-2791), vol. 29, Jan. 1984, p. 106-110.

Physics

General Physics

99

Electron Attachment, Gas Dissociation, Hydrogen Ions, Hydrogen Plasma, Molecular Excitation, Vibrational Spectra, Electron States, Ground State, Molecular Rotation, Plasma Jets

Scientific paper

Using a local-width resonant model, the cross sections for dissociative attachment of low-energy electrons to a rovibrationally excited H2 molecule in its ground electronic state are obtained. There are 294 such rovibrational levels. Only the contribution of the 2Sigma u + resonant state of H2(-)to the attachment process is investigated. Assuming a Maxwellian distribution for electron energies, the dissociative-attachment cross sections are converted into attachment rates for various rovibrational levels of H2. A significant enhancement of attachment rates occurs for endoergic reactions only, and the maximum possible rate for attachment to the ground electronic state of H2 is about 10 to the -8th cu cm/sec. Using the same energy distribution for electrons, the average energy carried by the H(-) ions is calculated for all possible rovibrational levels. More energetic ions are formed when the attachment process is exoergic, and even the most energetic H(-) ions have energies less than 0.5 eV. Furthermore, the attachment rates and the average ion energy appear to depend roughly on the total internal energy and not on the exact fraction of internal energy in rotational or vibrational modes.

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