• 主题
高级搜索  >
历史搜索 清空历史
首页> 美国政府科技报告 >High Resolution Infrared Absorption Spectroscopy of C60 Molecules and Clusters in Parahydrogen Solids.
【24h】

High Resolution Infrared Absorption Spectroscopy of C60 Molecules and Clusters in Parahydrogen Solids.

机译：高分辨率红外吸收光谱法研究C60分子和团簇在parahydrogen固体中的应用。

获取原文
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

We report the isolation of C60 molecules in cryogenic pH2 solids by the rapid vapor deposition method. New theoretical simulations of rovibrational spectra for low temperature isolated (12)C60 molecules, including boson-exchange symmetry restrictions on the rotational levels, predict a characteristic 'null gap' and unequal rotational line spacings for low-J values. High-resolution(IR) absorption spectra of the C60/pH2 samples failed to show rotationally resolved features, and in fact suggest that the majority of the C60 molecules are not rotating. However, spectra of the F1u(1) vibrational mode near 530 cm(-1) show linewidths of approximately 0.2 cm(-1)(FWHM),the sharpest IR absorption bands for C60 reported to date. Visible absorption spectra also show sharp features in the 600 nm region, supporting our contention of well isolated C60 molecules. The C60 molecules appear to stabilize the pH2 solid, inhibiting the fcc to hcp conversion which usually occurs upon annealing of rapid vapor deposited pH2 solids to T is approximately 5 K. We also report surprisingly strong C60-induced IR activity in the pH2 solid, and propose this phenomenon as a diagnostic for H2 molecules adsorbed by carbon nanotubes. C60/pH2 samples grown in an enclosed cell by laser ablation of solid C60 appear to contain predominantly (C60)n clusters; these clusters are too small to exhibit 'bulk' vibrational or electronic properties, as determined by IR and UV/visible absorption spectroscopies. Future experiments to disentangle the contributions of 13C isotopic substitution, pH2 matrix effects, and the putative hindered rotation of C60 molecules to the observed C60/pH2 IR lineshapes are presently under consideration.

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

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