Observation of D2H+ (or H2D+) products in coincidence with excited H* (or D*) atoms in the reaction of D2+ with H2

TL;DRAbstract

The reaction D2++H2→D2H++H*(n>1) or H2D++D*(n>1) is studied experimentally at a relative collision energy of 20 eV. The ionic products are angle and energy analyzed in coincidence with the excited atomic products. The latter are detected by the radiation they emit, possibly after quenching in case of metastable atoms. The contour diagrams obtained for the intensity of the D2H+ or H2D+ products as functions of their center-of-mass scattering angle and velocity show the presence of these two products, with a predominance of the former. These products are essentially found in low vibrational levels and the correlated atoms are observed predominantly in n=2 states; the 2s to 2p cross section ratio is found to be nearly equal to 0.35. That the considered reaction exists was actually predicted on the basis of its analogy with the reaction He++H2→HeH++H*(n>1). The main features of the two reactions are compared. The mechanism of the D2++H2 reaction is explained using an a

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