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3 results on '"Bruhns, Hjalmar"'

2. Experimental Results for H2 Formation from H- and H and Implications for First Star Formation.

Author

Kreckel, Holger, Bruhns, Hjalmar, Čížek, Martin, Glover, Simon C. O., Miller, Kenneth A., Urbain, Xavier, and Savin, Daniel W.

Subjects
*STAR formation, *HYDROGEN, *ENERGY measurement, *NUMERICAL calculations, UNIVERSE
Abstract

We have performed the first energy-resolved measurement of the associative detachment (AD) reaction H- + H → H2- → H2 + e-, which is the dominant process forming molecular hydrogen in the early universe. We find excellent agreement between our measurements and the most recent theoretical calculation of the AD process. We also present model calculations of the formation of protogalaxies in the early universe uitilizing the experimentally confirmed rate coefficient. [ABSTRACT FROM AUTHOR]

Published
2015
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3. MOLECULAR HYDROGEN FORMATION IN THE EARLY UNIVERSE: NEW IMPLICATIONS FROM LABORATORY MEASUREMENTS

Author

Kreckel, Holger, Bruhns, Hjalmar, Miller, Kenneth A., Savin, Daniel W., Cizek, Martin, Simon Glover, and Urbain, Xavier

Subjects
Plasma (Ionized gases), Physics, Astrophysics
Abstract

We have performed the first energy-resolved measurement of the associative detachment (AD) reaction H- + H → H2 + e-: This reaction is the dominant formation pathway for H2 during the epoch of first star formation in the early universe. Despite being the most fundamental anion-neutral chemical reaction, experiment and theory have failed to converge in both magnitude and energy dependence. The uncertainty in this rate coefficient severely limits our under- standing of the formation of the first stars and protogalaxies.

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