• 主题
高级搜索  >
历史搜索 清空历史
首页> 美国卫生研究院文献>Proceedings of the National Academy of Sciences of the United States of America >Sulfur isotopic fractionation in vacuum UV photodissociation of hydrogen sulfide and its potential relevance to meteorite analysis
【2h】

Sulfur isotopic fractionation in vacuum UV photodissociation of hydrogen sulfide and its potential relevance to meteorite analysis

机译：硫化氢在真空紫外光解中的硫同位素分馏及其与陨石分析的潜在关系

代理获取
本网站仅为用户提供外文OA文献查询和代理获取服务，本网站没有原文。下单后我们将采用程序或人工为您竭诚获取高质量的原文，但由于OA文献来源多样且变更频繁，仍可能出现获取不到、文献不完整或与标题不符等情况，如果获取不到我们将提供退款服务。请知悉。
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Select meteoritic classes possess mass-independent sulfur isotopic compositions in sulfide and organic phases. Photochemistry in the solar nebula has been attributed as a source of these anomalies. Hydrogen sulfide (H2S) is the most abundant gas-phase species in the solar nebula, and hence, photodissociation of H2S by solar vacuum UV (VUV) photons (especially by Lyman-α radiation) is a relevant process. Because of experimental difficulties associated with accessing VUV radiation, there is a paucity of data and a lack of theoretical basis to test the hypothesis of a photochemical origin of mass-independent sulfur. Here, we present multiisotopic measurements of elemental sulfur produced during the VUV photolysis of H2S. Mass-independent sulfur isotopic compositions are observed. The observed isotopic fractionation patterns are wavelength-dependent. VUV photodissociation of H2S takes place through several predissociative channels, and the measured mass-independent fractionation is most likely a manifestation of these processes. Meteorite sulfur data are discussed in light of the present experiments, and suggestions are made to guide future experiments and models.
机译：选择的陨石类别在硫化物和有机相中具有质量无关的硫同位素组成。太阳星云中的光化学被认为是这些异常的根源。硫化氢（H2S）是太阳星云中最丰富的气相物质，因此，太阳真空UV（VUV）光子（尤其是通过Lyman-α辐射）引起的H2S光解是一个相关过程。由于与获取VUV辐射相关的实验困难，因此缺乏数据和缺乏理论依据来检验质量无关硫的光化学起源的假设。在这里，我们介绍了H2S的VUV光解过程中产生的元素硫的多同位素测量。观察到质量无关的硫同位素组成。观察到的同位素分馏模式与波长有关。 H2S的VUV光解离通过几个预离解通道进行，所测得的不依赖质量的分级分离很可能是这些过程的体现。根据目前的实验讨论了陨石硫的数据，并提出了一些建议以指导将来的实验和模型。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
代理获取

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号