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Infrared spectroscopy of organic molecules trapped in solid parahydrogen: Applications in Hydrogen of clustering and in situ UV photolysis.

机译:固体对氢中捕获的有机分子的红外光谱:团簇和原位UV光解在氢中的应用。

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摘要

One unique aspect to the synthesis of chemically-doped parahydrogen (pH 2) solids is that there is always some amount (300 ppm) of residual orthohydrogen (oH2) present. One consequence of this that my research has investigated is that oH2 molecules preferentially cluster to the organic dopant leading to resolvable perturbations to the high-resolution infrared spectrum of the chemical dopant. The FTIR spectra of formic acid and N-methylacetamide solvated in solid molecular hydrogen (SMH) crystals with varying amounts of oH2 are presented in order to elucidate the effects of oH2 clustering on the high-resolution vibrational spectra of these molecules.;The in situ photochemistry of molecular precursors in SMH is expected to be very different from the analogous photochemistry in the gas phase and rare gas matrices. The results of the 193 nm photolysis of formic acid in solid pH2 are presented and confirm basic differences in the branching ratios between products from analogous studies in rare gas matrices. These studies help quantify the lack of a cage effect in solid pH2 for the UV photolysis of precursors. Further, this qualitative difference in the in situ UV photochemistry permits high concentrations of radicals to be photogenerated allowing low temperature radical chemistry to be explored.
机译:合成化学掺杂的对氢(pH 2)固体的一个独特方面是,总存在一定量(<300 ppm)的残留原氢(oH2)。我的研究已经调查了这一结果,其结果是oH2分子优先聚集在有机掺杂剂上,导致对化学掺杂剂的高分辨率红外光谱可分辨的扰动。为了阐明oH2团簇对这些分子的高分辨振动光谱的影响,提出了在具有不同oH2量的固体分子氢(SMH)晶体中溶剂化的甲酸和N-甲基乙酰胺的FTIR光谱。预计SMH中分子前体的光化学与气相和稀有气体基质中的类似光化学有很大不同。给出了在固体pH2中甲酸193 nm光解的结果,并证实了来自稀有气体基质中类似研究的产物之间支化比率的基本差异。这些研究有助于量化前体的紫外线光解过程中,固体pH2中缺乏笼罩效应。此外,原位UV光化学中的这种质量差异允许高浓度的自由基被光生,从而可以探索低温自由基化学。

著录项

  • 作者

    Paulson, Leif O.;

  • 作者单位

    University of Wyoming.;

  • 授予单位 University of Wyoming.;
  • 学科 Chemistry Organic.;Chemistry Physical.
  • 学位 Ph.D.
  • 年度 2011
  • 页码 159 p.
  • 总页数 159
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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