2006年3月
Cryogenic NMR spectroscopy of endohedral hydrogen-fullerene complexes
JOURNAL OF CHEMICAL PHYSICS
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- 巻
- 124
- 号
- 10
- 開始ページ
- 104507
- 終了ページ
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1063/1.2174012
- 出版者・発行元
- AMER INST PHYSICS
We have observed H-1 NMR spectra of hydrogen molecules trapped inside modified fullerene cages under cryogenic conditions. Experiments on static samples were performed at sample temperatures down to 4.3 K, while magic-angle-spinning (MAS) experiments were performed at temperatures down to 20 K at spinning frequencies of 15 kHz. Both types of NMR spectra show a large increase in the intramolecular H-1-H-1 dipolar coupling at temperatures below 50 K, revealing thermal selection of a small number of spatial rotational states. The static and MAS spectra were compared to estimate the degree of sample heating in high-speed cryogenic MAS-NMR experiments. The cryogenic MAS-NMR data show that the site resolution of magic-angle-spinning NMR may be combined with the high signal strength of cryogenic operation and that cryogenic phenomena may be studied with chemical site selectivity.
- リンク情報
- ID情報
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- DOI : 10.1063/1.2174012
- ISSN : 0021-9606
- eISSN : 1089-7690
- Web of Science ID : WOS:000235988400029