Ion Trap Studies of H- + H → H2 + e - between 10 and 135 K

Details Ion Trap Studies of H- + H → H2 + e - between 10 and 135 K Ion Trap Studies of H- + H → H2 + e - between 10 and 135 K

Apr 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012apj...749...22g&link_type=abstract

The Astrophysical Journal, Volume 749, Issue 1, article id. 22 (2012).

Astronomy and Astrophysics

Astronomy

Astrochemistry, Atomic Processes, Early Universe, Methods: Laboratory, Molecular Processes

Scientific paper

Thermal rate coefficients for forming H2 via associative detachment in H- + H collisions were determined using the combination of a 22-pole ion trap (22PT) with a skimmed effusive beam of atomic hydrogen penetrating the ion cloud. The temperature of both reactants have been varied independently (ion trap: T 22PT = 10-150 K, neutral beam accommodator T ACC = 10, 50, 120 K). Using various combinations, the temperature range between 10 and 135 K has been accessed for the first time experimentally. The effective number density of H (typically some 108 cm-3) is determined in situ via chemical probing with CO+ 2 ions. With decreasing temperature, the measured thermal rate coefficients decrease slowly from 5.5 × 10-9 cm3 s-1 at 135 K to 4.1 × 10-9 cm3 s-1 at 10 K. The relative error is 10%, while the absolute values may deviate systematically by up to 40%, due to uncertainties in the calibration reaction. Significant improvements of the versatile and sensitive experiment are possible, e.g., by using electron transfer from H to D+ as calibration standard.

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