Inelastic electron collisions of the isotopically symmetric helium dimer ionHe2+4in a storage ring

Autor:	Steffen Novotny, Andreas Wolf, Michael Lange, Daniel Strasser, Lutz Lammich, M. B. Mendes, Xavier Urbain, Henrik Buhr, Daniel Zajfman, V. M. Andrianarijaona, Jens Hoffmann, Michael Motsch, Holger Kreckel, S. Altevogt, O. Novotny, D. Schwalm, Michael Lestinsky, Henrik B. Pedersen
Rok vydání:	2008
Předmět:	Physics Excited state Physics::Atomic and Molecular Clusters Vibrational energy relaxation Helium dimer Electron Atomic physics Atomic and Molecular Physics and Optics Dissociative recombination Excitation Dissociation (chemistry) Ion
Zdroj:	Physical Review A. 77
ISSN:	1094-1622 1050-2947
DOI:	10.1103/physreva.77.032719
Popis:	Rate coefficients for dissociative recombination (DR), dissociative excitation (DE), and vibrational excitation between the helium dimer ion He-4(2)+ and electrons from a few meV up to 40 eV were measured using fast (3.8 and 8.3 MeV) ion beams stored for up to 85 s. Vibrational relaxation to greater than 95% in the v = 0 level was achieved by collisions with cold electrons over 50 s. Low-energy, strongly v-dependent DR rate coefficients are given for v = 0, 1, and >= 2. The rate coefficients at higher energies for v = 0, with DR and DE given on an absolute scale, are compared to results from recent wave-packet calculations on the fast dissociation dynamics of the doubly excited helium dimer, where the three processes occur as competing reaction channels. Also given are rate coefficients for vibrationally superelastic electron collisions at near 10 meV average energy and the approximate vibrational excitation cross section for fast collisions with the residual gas.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::961fa562f1a799a34ba5031c56e54f58 https://doi.org/10.1103/physreva.77.032719 Zobrazit plný text záznamu