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Low-energy structure in the Ar + + H 2 reaction: Role of …

1991; American Physical Society; Volume: 67; Issue: 10 Linguagem: Inglês

10.1103/physrevlett.67.1254

1092-0145

Paolo Tosi, Fausto Eccher, Davide Bassi, Fernando Pirano, David Cappelletti, Vincenz̊o Aquilanti,

Fluorine in Organic Chemistry

Integral cross sections for ${\mathrm{ArH}}^{+}$ production in the ${\mathrm{Ar}}^{+}$+${\mathrm{H}}_{2}$ reaction were measured by a novel high-resolution apparatus, at low collision energies (0.025--1 eV). The observed features are interpreted as due to successive openings of vibronic levels of the intermediate Ar-${\mathrm{H}}_{2}^{+}$ charge-transfer complex. The proposed potential-energy surfaces involve an accurate description of the entrance channels at long range including fine-structure and \ensuremath{\Sigma}-\ensuremath{\Pi} splitting effects.