Experimental Determination of the Rate Constant for the Associative Detachment Reaction H- + H \longrightarrow H2 + e - at 300 K

Details Experimental Determination of the Rate Constant for the Associative Detachment Reaction H- + H \longrightarrow H2 + e - at 300 K Experimental Determination of the Rate Constant for the Associative Detachment Reaction H- + H \longrightarrow H2 + e - at 300 K

Nov 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009apj...705l.172m&link_type=abstract

The Astrophysical Journal Letters, Volume 705, Issue 2, pp. L172-L175 (2009).

Astronomy and Astrophysics

Astronomy

8

Astrochemistry, Early Universe, Molecular Processes, Methods: Laboratory

Scientific paper

We have determined the rate constant for the associative detachment reaction of hydride ions with hydrogen atoms (H- + H \longrightarrow H2 + e -) at 300 K to be 2.0 (±0.6) × 10-9 cm3 s-1, where the error bars represent the total absolute error and include 1σ of the measured values; the error analysis is described in the Appendix. Experiments were carried out in a flowing afterglow instrument using the well-characterized reactions of Cl- + H and OH- + H to calibrate the concentration of hydrogen atoms. Our measurement represents a significant improvement over previous determinations and will reduce uncertainties in cosmological models that rely on this reaction rate constant.

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