The role of the three body photodissociation channel of water in the evolution of dioxygen in astrophysical applications
The role of the three body photodissociation channel of water in the evolution of dioxygen in astrophysical applications
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DOI：
10.1039/d1cp00565k
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发表时间：
2021-04-06
影响因子：
3.3
通讯作者：
Skodje, Rex T.
中科院分区：
文献类型：
--
作者：
An, Suming;Ranjan, Sukrit;Skodje, Rex T.
最近在大连相干光源(DCLS)的一项实验提供了在真空紫外线(VUV)区前所未有的波长范围内测量水蒸气光解的部分截面。结果表明，三体解离通道H+H+O(P-3/D-1)在波长121.6 nm处变得比Lymanα线短。目前的工作探索了几个天体物理驱动的例子的这一发现的动力学后果。未屏蔽的太阳辐射照射稀薄的低温气体，类似于彗星彗星的早期光化学处理，显示出在较短的时间内O-2-分子的产生显著增加，
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-3/D-1), becomes prominent at wavelengths shorter than the Lyman alpha-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-2-molecules at shorter times,