Oscar Martinez et al 2009 ApJ 705 L172 doi:10.1088/0004-637X/705/2/L172
EXPERIMENTAL DETERMINATION OF THE RATE CONSTANT FOR THE ASSOCIATIVE DETACHMENT REACTION H– + H 
H2 + e – AT 300 K
FREE ISSUE
Oscar Martinez1, Zhibo Yang1, Nicholas B. Betts1, Theodore P. Snow2,3 and Veronica M. Bierbaum1,3
Show affiliationsWe have determined the rate constant for the associative detachment reaction of hydride ions with hydrogen atoms (H– + H 
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.
- Keywords
astrochemistry; early universe; molecular processes; methods: laboratory
- PACS
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- Dates
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Issue 2 (2009 November 10)
Received 2009 August 12, accepted for publication 2009 October 5
Published 2009 October 22
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Experimental Determination of the Rate Constant for the Associative Detachment Reaction H– + H H2 + e – at 300 K
Oscar Martinez et al 2009 ApJ 705 L172
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