| Title: |
Spectroscopy and dissociative recombination of the lowest rotational states of H3+ |
| Authors: |
Petrignani, A., Kreckel, H., Berg, M. H., Altevogt, S., Bing, D., Buhr, H., Froese, M., Hoffmann, J., Jordon-Thaden, B., Krantz, C., Mendes, M. B., Novotný, O., Novotny, S., Orlov, D. A., Reinhardt, S., Wolf, A. |
| Source: |
Journal of Physics: Conference Series 192 (2009) 012022 |
| Publication Year: |
2008 |
| Collection: |
Physics (Other) |
| Subject Terms: |
Physics - Atomic Physics, Physics - Chemical Physics |
| More Details: |
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.
Comment: 10 pages, 9 figures, to be published in Journal of Physics: Conference Proceedings |
| Document Type: |
Working Paper |
| DOI: |
10.1088/1742-6596/192/1/012022 |
| Access URL: |
http://arxiv.org/abs/0810.0405 |
| Accession Number: |
edsarx.0810.0405 |
| Database: |
arXiv |
