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Probing the low-temperature rotational population of H2D+

Oskar Asvany, Edouard Hugo, Serjoscha Wahed and Stephan Schlemmer

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The gas phase exchange reactions of isotopologues of H+3 with isotopologues of H2 are responsible for the observed deuteration in low-temperature interstellar clouds. At the prevailing cryogenic temperatures many quantum effects, as zero-point vibrational energies, large rotational level spacings and nuclear spin effects become important. In order to understand the processes on a level-to-level basis, experiments in a 22-pole ion trap are carried out accompanied by microcanonical simulations. In particular, the method of laser induced reaction (LIR) is applied to probe the four lowest rotational levels of H2D+.


PACS

82.30.Fi Ion-molecule, ion-ion, and charge-transfer reactions

33.20.Sn Rotational analysis

82.20.Pm Rate constants, reaction cross sections, and activation energies

98.58.Db Molecular clouds, H2 clouds, dense clouds, and dark clouds

Subjects

Atomic and molecular physics

Astrophysics and astroparticles

Chemical physics and physical chemistry

Dates

Issue 1 (2009)



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