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首页> 外文期刊>RSC Advances >Photochemistry and desorption induced by X-rays in water rich astrophysical ice analogs: implications for the moon Enceladus and other frozen space environments
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Photochemistry and desorption induced by X-rays in water rich astrophysical ice analogs: implications for the moon Enceladus and other frozen space environments

机译：水中富含天体物理冰块中的X射线诱导的光化学和解吸：对月球Enceladus和其他冰冻空间环境的影响

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Soft X-rays are an important agent for chemical processing in the Solar System and in the interstellar medium. The photolysis and photodesorption processes of H2O-rich ices triggered by soft X-rays was, experimentally, addressed in this paper. The experiments were performed at the Brazilian synchrotron facility LNLS/CNPEN employing broadband radiation (from 6 to 2000 eV; mainly soft X-rays and a small fraction of VUV) in solid samples at temperatures of 20 and 80 K. The icy samples were monitored by infrared spectroscopy. We determined the effective destruction cross section (in the order 10(-18) cm(2)) as well as the formation cross section for the new species produced after the irradiation. Among them, we list OCN-, CO, CO3, CH3OH, H2O2, HCOO-, NH4+, HCONH2 and CH3HCO, mostly formed in the experiment at 80 K. The chemical equilibrium stage was characterized and molecular abundances were quantified. In addition, we discuss a methodology to estimate the amount of unknown species in the ice produced by photolysis. The samples reach chemical equilibrium at fluences around 2-3 x 10(18) cm(-2). Timescales for reaching chemical equilibrium in space environments illuminated by X-rays were given, as well as the desorption yields induced by X-rays. The astrophysical implication on the surface chemistry and desorption processes at the moon Enceladus are provided.
机译：软X射线是太阳系和星际介质中的化学加工的重要剂。通过软X射线触发的H 2 O的富含光解和光点处理方法在本文中进行了实验解决。在使用宽带辐射（从6至2000 eV;主要的样品中，在20和80K的温度下采用宽带辐射（主要软X射线和大部分Vuv）进行实验。监测冰冷的样品通过红外光谱。我们确定了有效的破坏横截面（在10（-18）cm（2）中）以及用于照射后产生的新物种的形成横截面。其中，我们列出了OCN-，CO，CO 3，CH 3 OH，H 2 O 2，HCOO-，NH 4 +，HCONH2和CH3CO，主要在80K的实验中形成。化学平衡阶段的特征和分子丰富量化。此外，我们讨论了一种方法来估计光解产生的冰中未​​知物种的量。样品在流量达到约2-3×10（18）厘米（-2）的流量达到化学平衡。给出了X射线照射的空间环境中达到化学平衡的时间尺度，以及X射线诱导的解吸产率。提供了在月球中的表面化学和解吸过程的天体物理含义。

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    《RSC Advances》 |2019年第49期|共18页
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  • 正文语种 eng
  • 中图分类 化学;
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