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

被引：56

作者：

Novotny, Oldrich ^{[1
]}

Wilhelm, Patrick ^{[1
]}

Paul, Daniel ^{[1
]}

Kalosi, Abel ^{[1
,2
]}

Saurabh, Sunny ^{[1
]}

Becker, Arno ^{[1
]}

Blaum, Klaus ^{[1
]}

George, Sebastian ^{[1
,3
]}

Goeck, Juergen ^{[1
]}

Grieser, Manfred ^{[1
]}

Grussie, Florian ^{[1
]}

von Hahn, Robert ^{[1
]}

Krantz, Claude ^{[1
]}

Kreckel, Holger ^{[1
]}

Meyer, Christian ^{[1
]}

Mishra, Preeti M. ^{[1
]}

Muell, Damian ^{[1
]}

Nuesslein, Felix ^{[1
]}

Orlov, Dmitry A. ^{[1
]}

Rimmler, Marius ^{[1
]}

Schmidt, Viviane C. ^{[1
]}

Shornikov, Andrey ^{[1
]}

Terekhov, Aleksandr S. ^{[4
]}

Vogel, Stephen ^{[1
]}

Zajfman, Daniel ^{[5
]}

Wolf, Andreas ^{[1
]}

机构：

[1] Max Planck Inst Kernphys, Saupfercheckweg 1, D-69117 Heidelberg, Germany

[2] Charles Univ Prague, Fac Math & Phys, CR-18000 Prague, Czech Republic

[3] Ernst Moritz Arndt Univ Greifswald, Inst Phys, D-17487 Greifswald, Germany

[4] Rzhanov Inst Semicond Phys, Novosibirsk 630090, Russia

[5] Weizmann Inst Sci, IL-76100 Rehovot, Israel

来源：

SCIENCE | 2019年 / 365卷 / 6454期

基金：

欧洲研究理事会;

关键词：

DISSOCIATIVE RECOMBINATION; CHEMISTRY; DISTRIBUTIONS; EXCITATION;

D O I：

10.1126/science.aax5921

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

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.

引用

页码：676 / +

页数：27

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