The role of the three body photodissociation channel of water in the evolution of dioxygen in astrophysical applications

An，Suming1; Ranjan，Sukrit2,3,4,5; Yuan，Kaijun6; Yang，Xueming6,7; Skodje，Rex T.1

2021-04-21

10.1039/d1cp00565k

PHYSICAL CHEMISTRY CHEMICAL PHYSICS   影响因子和分区

1463-9076

A recent experiment at the Dalian Coherent Light Source (DCLS) has provided measurements of the partial cross sections for the photodissociation of water vapor over an unprecedented range of wavelengths in the vacuum ultraviolet (VUV) region. It was found that the three body dissociation channel, H + H + O(P/D), becomes prominent at wavelengths shorter than the Lyman α-line at 121.6 nm. The present work explores the kinetic consequences of this discovery for several astrophysically motivated examples. The irradiation of a dilute low-temperature gas by unscreened solar radiation, similar to early stage photochemical processing in a comet coma, shows significant increase in the production of O-molecules at shorter times, <1 day, that might physically correspond to the photochemical reaction zone of the coma. Several examples of planetary atmospheres show increased O-atom production at high altitudes but relatively little modification of the equilibrium Oconcentrations predicted by conventional models.

SCI ; EI

英语

通讯

WOS:000639548800001

20211810276367

Light sources ; Photochemical reactions ; Photodissociation ; Temperature

Thermodynamics:641.1 ; Light/Optics:741.1 ; Physical Chemistry:801.4

CHEMISTRY

2-s2.0-85104847478

Scopus

1.Department of Chemistry,University of Colorado,Boulder,80309-215,United States
2.Department of Earth,Atmospheric & Planetary Sciences,Massachusetts Institute of Technology,Cambridge,02139,United States
3.Center for Interdisciplinary Exploration & Research in Astrophysics,Northwestern University,Evanston,60640,United States
4.Department of Physics & Astronomy,Northwestern University,Evanston,60640,United States
5.Blue Marble Space Institute of Science,Seattle,98104,United States
6.State Key Laboratory of Molecular Reaction Dynamics and Dalian Coherent Light Source,Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian,457 Zhongshan Road,116023,China
7.Department of Chemistry,College of Science,Southern University of Science and Technology,Shenzhen,518055,China

An，Suming,Ranjan，Sukrit,Yuan，Kaijun,et al. The role of the three body photodissociation channel of water in the evolution of dioxygen in astrophysical applications[J]. PHYSICAL CHEMISTRY CHEMICAL PHYSICS,2021,23(15):9235-9248.

An，Suming,Ranjan，Sukrit,Yuan，Kaijun,Yang，Xueming,&Skodje，Rex T..(2021).The role of the three body photodissociation channel of water in the evolution of dioxygen in astrophysical applications.PHYSICAL CHEMISTRY CHEMICAL PHYSICS,23(15),9235-9248.

An，Suming,et al."The role of the three body photodissociation channel of water in the evolution of dioxygen in astrophysical applications".PHYSICAL CHEMISTRY CHEMICAL PHYSICS 23.15(2021):9235-9248.