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Spectroscopy and dissociative recombination of the lowest rotational states of H+3

A Petrignani1, H Kreckel2, M H Berg1, S Altevogt1, D Bing1, H Buhr3, M Froese1, M Grieser1, J Hoffmann1, B Jordon-Thaden1, C Krantz1, M B Mendes1, O Novotný1, S Novotny1, D A Orlov1, S Reinhardt1,4 and A Wolf1

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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.


PACS

34.80.Lx Recombination, attachment, and positronium formation

33.15.Mt Rotation, vibration, and vibration-rotation constants

33.20.Vq Vibration-rotation analysis

33.80.Gj Diffuse spectra; predissociation, photodissociation

Subjects

Atomic and molecular physics

Dates

Issue 1 (2009)



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