Quantum-state-selective electron recombination studies suggest enhanced abundance of primordial HeH+

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F19%3A10405908" target="_blank" >RIV/00216208:11320/19:10405908 - isvavai.cz</a>

Výsledek na webu

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=4t8RcV8n38" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=4t8RcV8n38</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1126/science.aax5921" target="_blank" >10.1126/science.aax5921</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Quantum-state-selective electron recombination studies suggest enhanced abundance of primordial HeH+

Popis výsledku v původním jazyce

The epoch of first star formation in the early Universe was dominated by simple atomic and molecular species consisting mainly of two elements: hydrogen and helium. Gaining insight into this constitutive era requires a thorough understanding of molecular reactivity under primordial conditions. We used a cryogenic ion storage ring combined with a merged electron beam to measure state-specific rate coefficients of dissociative recombination, a process by which electrons destroy molecular ions. We found a pronounced decrease of the electron recombination rates for the lowest rotational states of the helium hydride ion (HeH+), compared with previous measurements at room temperature. The reduced destruction of cold HeH+ translates into an enhanced abundance of this primordial molecule at redshifts of first star and galaxy formation.

Název v anglickém jazyce

Quantum-state-selective electron recombination studies suggest enhanced abundance of primordial HeH+

Popis výsledku anglicky

The epoch of first star formation in the early Universe was dominated by simple atomic and molecular species consisting mainly of two elements: hydrogen and helium. Gaining insight into this constitutive era requires a thorough understanding of molecular reactivity under primordial conditions. We used a cryogenic ion storage ring combined with a merged electron beam to measure state-specific rate coefficients of dissociative recombination, a process by which electrons destroy molecular ions. We found a pronounced decrease of the electron recombination rates for the lowest rotational states of the helium hydride ion (HeH+), compared with previous measurements at room temperature. The reduced destruction of cold HeH+ translates into an enhanced abundance of this primordial molecule at redshifts of first star and galaxy formation.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10305 - Fluids and plasma physics (including surface physics)

Projekt

—

Návaznosti

S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2019

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Science

ISSN

0036-8075

e-ISSN

—

Svazek periodika

365

Číslo periodika v rámci svazku

6454

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

4

Strana od-do

676-679

Kód UT WoS článku

000481688700043

EID výsledku v databázi Scopus

2-s2.0-85069513846