About: Experimental Results for H-2 Formation from H- and H and Implications for First Star Formation

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
Description	During the epoch of first star formation, molecular hydrogen (H-2) generated via associative detachment (AD) of H- and H is believed to have been the main coolant of primordial gas for temperatures below 10(4) kelvin. The uncertainty in the cross section for this reaction has limited our understanding of protogalaxy formation during this epoch and of the characteristic masses and cooling times for the first stars. We report precise energy-resolved measurements of the AD reaction, made with the use of a specially constructed merged-beams apparatus. Our results agreed well with the most recent theoretically calculated cross section, which we then used in cosmological simulations to demonstrate how the reduced AD uncertainty improves constraints of the predicted masses for Population III stars. During the epoch of first star formation, molecular hydrogen (H-2) generated via associative detachment (AD) of H- and H is believed to have been the main coolant of primordial gas for temperatures below 10(4) kelvin. The uncertainty in the cross section for this reaction has limited our understanding of protogalaxy formation during this epoch and of the characteristic masses and cooling times for the first stars. We report precise energy-resolved measurements of the AD reaction, made with the use of a specially constructed merged-beams apparatus. Our results agreed well with the most recent theoretically calculated cross section, which we then used in cosmological simulations to demonstrate how the reduced AD uncertainty improves constraints of the predicted masses for Population III stars. (en)
Title	Experimental Results for H-2 Formation from H- and H and Implications for First Star Formation Experimental Results for H-2 Formation from H- and H and Implications for First Star Formation (en)
skos:prefLabel	Experimental Results for H-2 Formation from H- and H and Implications for First Star Formation Experimental Results for H-2 Formation from H- and H and Implications for First Star Formation (en)
skos:notation	RIV/00216208:11320/10:10079249!RIV11-GA0-11320___
http://linked.open...avai/riv/aktivita	P Z
http://linked.open...avai/riv/aktivity	P(GA202/07/0833), Z(MSM0021620860)
http://linked.open...iv/cisloPeriodika	5987
http://linked.open...vai/riv/dodaniDat	2011
http://linked.open...aciTvurceVysledku	Čížek, Martin
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Univerzita Karlova v Praze / Matematicko-fyzikální fakulta
http://linked.open...dnocenehoVysledku	258327
http://linked.open...ai/riv/idVysledku	RIV/00216208:11320/10:10079249
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	star formation; associative detachment; merged-beams experiments (en)
http://linked.open.../riv/klicoveSlovo	associative detachment star formation merged-beams experiments
http://linked.open...odStatuVydavatele	US - Spojené státy americké
http://linked.open...ontrolniKodProRIV	[FA6578FED2DB]
http://linked.open...i/riv/nazevZdroje	Science
http://linked.open...in/vavai/riv/obor	BG
http://linked.open...ichTvurcuVysledku	1 (xsd:int)
http://linked.open...cetTvurcuVysledku	7 (xsd:int)
http://linked.open...vavai/riv/projekt	Towards nonlocal resonance dynamics of polyatomic systems
http://linked.open...UplatneniVysledku	2010
http://linked.open...v/svazekPeriodika	329
http://linked.open...iv/tvurceVysledku	Bruhns, H. Kreckel, H. Miller, K. A. Savin, D. W. Urbain, X. Čížek, Martin Glover, S. C. O.
http://linked.open...ain/vavai/riv/wos	000279402700033
http://linked.open...n/vavai/riv/zamer	Fyzikální studium objektů a procesů ve sluneční soustavě a v astrofyzikálních systémech
issn	0036-8075
number of pages	3 (xsd:int)
http://localhost/t...ganizacniJednotka	11320

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