Radiolytic Production, Trapping, and Desorption of H2 at Elevated Temperatures in Amorphous and Crystalline Astrophysical and Planetary H2O Ice Analogs

IF 2.6 3区化学 Q2 CHEMISTRY, MULTIDISCIPLINARY

ACS Earth and Space Chemistry Pub Date : 2026-09-17 Epub Date: 2026-08-22 DOI:10.1021/acsearthspacechem.6c00205

Rahul K. Kushwaha, Murthy S. Gudipati, Bryana L. Henderson

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引用次数: 0

Abstract

We have conducted a comprehensive study on trapping and sublimation of H₂ in H₂O ice. The results demonstrate that codeposited H₂:H₂O ices (1:5) at 7 K release H₂ in two temperature regions during temperature-programmed desorption (TPD), at ∼25 K and ∼80 K, whereas H₂ produced in H₂O ices via electron irradiation is released in three regions, at ∼25 K, ∼80 K, and ∼110 K. The higher the electron energy, the greater the amount of H₂ trapped in and released from H₂O ice at ∼110 K. Following irradiation, the ∼80 K release of H₂ is observed in amorphous but not crystalline ice. To better understand the trapping and release behavior of H₂ in H₂O ice, we carried out systematic laboratory studies under different astrophysical and planetary conditions, as presented here, and compared them with previous studies. The implications of our work will range from outgassing from cometary nuclei, protoplanetary disk ice chemistry, nongravitational acceleration of interstellar objects such as 1I/′Oumuamua, and outgassing of H₂ from irradiated icy bodies such as Europa and Enceladus in the solar system. Our work also infers radiolytic production and storage of H₂ in the lunar permanently shadowed regions.

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无定形和结晶天体物理和行星水冰类似物中H2在高温下的辐射分解、捕获和解吸

我们对H2O冰中H2的捕获和升华进行了全面的研究。结果表明，共沉积H2:H2O冰（1:5）在7 K温度下，在温度程序化解吸（TPD）过程中，在~ 25 K和~ 80 K两个温度区域释放H2，而通过电子辐照在H2O冰中产生的H2在~ 25 K、~ 80 K和~ 110K三个区域释放。电子能量越高，在~ 110K时从H2O冰中捕获和释放的H2量越大。辐照后，在非晶冰中观察到H2的~ 80 K释放，而不是结晶冰。为了更好地了解H2O冰中H2的捕获和释放行为，我们在不同的天体物理和行星条件下进行了系统的实验室研究，并与以往的研究进行了比较。我们工作的意义将包括从彗星核释放气体，原行星盘冰化学，星际物体的非重力加速，如1I/ ' Oumuamua，以及从太阳系中辐照的冰体（如木卫二和土卫二）释放氢气。我们的工作还推断了在月球永久阴影区域产生和储存氢的放射性。

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来源期刊

ACS Earth and Space Chemistry Earth and Planetary Sciences-Geochemistry and Petrology

CiteScore

5.30

自引率

11.80%

发文量

249

期刊介绍： The scope of ACS Earth and Space Chemistry includes the application of analytical, experimental and theoretical chemistry to investigate research questions relevant to the Earth and Space. The journal encompasses the highly interdisciplinary nature of research in this area, while emphasizing chemistry and chemical research tools as the unifying theme. The journal publishes broadly in the domains of high- and low-temperature geochemistry, atmospheric chemistry, marine chemistry, planetary chemistry, astrochemistry, and analytical geochemistry. ACS Earth and Space Chemistry publishes Articles, Letters, Reviews, and Features to provide flexible formats to readily communicate all aspects of research in these fields.