Spectroscopy and dissociative recombination of the lowest rotational states of H3+
A. Petrignani, H. Kreckel, M. H. Berg, S. Altevogt, D. Bing, H. Buhr, M. Froese, J. Hoffmann, B. Jordon-Thaden, C. Krantz, M. B. Mendes, O. Novotný, S. Novotny,… 展开作者
A. Petrignani, H. Kreckel, M. H. Berg, S. Altevogt, D. Bing, H. Buhr, M. Froese, J. Hoffmann, B. Jordon-Thaden, C. Krantz, M. B. Mendes, O. Novotný, S. Novotny, D. A. Orlov, S. Reinhardt, A. Wolf
备注：
10 pages, 9 figures, to be published in Journal of Physics: Conference Proceedings
发表信息：
Journal of Physics: Conference Series 192 (2009) 012022
The dissociative recombination of the lowest rotational states of H3+ has been investigated at the storage ring TSR using a cryogenic 22-pole radiofrequency ion trap as injector. The H3+ was cooled with buffer gas at ~15 K to the lowest rotational levels, (J,G)=(1,0) and (1,1), which belong to the ortho and para proton-spin symmetry, respectively. The rate coefficients and dissociation dynamics of H3+(J,G) populations produced with normal- and para-H2 were measured and compared to the rate and dynamics of a hot H3+ beam from a Penning source. The production of cold H3+ rotational populations was separately studied by rovibrational laser spectroscopy using chemical probing with argon around 55 K. First results indicate a ~20% relative increase of the para contribution when using para-H2 as parent gas. The H3+ rate coefficient observed for the para-H2 source gas, however, is quite similar to the H3+ rate for the normal-H2 source gas. The recombination dynamics confirm that for both source gases, only small populations of rotationally excited levels are present. The distribution of 3-body fragmentation geometries displays a broad part of various triangular shapes with an enhancement of ~12% for events with symmetric near-linear configurations. No large dependences on internal state or collision energy are found.
Unified treatment of resonant and non-resonant mechanisms in dissociative recombination: benchmark study of CH$^+$
University of Central Florida（中佛罗里达大学）；Université de Bordeaux（波尔多大学）；Purdue University（普渡大学）；Wuhan University of Technology（武汉理工大学）；Université Paris-Saclay（巴黎萨克雷大学）
Theoretical study of the excited states of NeH and of their non-adiabiatic couplings: a preliminary for the modeling of the dissociative recombination of NeH+
