Internal rotation and spin conversion of CH3OH in solid para-hydrogen
Internal rotation and spin conversion of CH3OH in solid para-hydrogen
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DOI：
10.1126/science.1121300
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发表时间：
2006-01-20
期刊：
影响因子：
56.9
通讯作者：
Hougen, JT
中科院分区：
文献类型：
--
作者：
Lee, YP;Wu, YJ;Hougen, JT
量子固体仲氢（p-H-2）最近被证明是有用的基质隔离光谱。嵌入在这个主机的化合物的光谱线是非常狭窄的，和几个物种已被报道在p-H-2旋转。我们发现，一个p-H-2矩阵抑制旋转的孤立的甲醇（CH 3OH），但仍然允许内部旋转的C-O键，与分裂的E/A扭转双峰的内部旋转耦合的振动模式是定性一致的CH 3OH在气相中。这种简化的高分辨率光谱进一步揭示了主基质中从E种到A种的核自旋对称性的缓慢转换，为天体物理来源的核自旋转换提供了潜在的见解。
The quantum solid para-hydrogen (p-H-2) has recently proven useful in matrix isolation spectroscopy. Spectral lines of compounds embedded in this host are unusually narrow, and several species have been reported to rotate in p-H-2. We found that a p-H-2 matrix inhibits rotation of isolated methanol (CH3OH) but still allows internal rotation about the C-O bond, with splittings of the E/A torsional doublet in internal rotation-coupled vibrational modes that are qualitatively consistent with those for CH3OH in the gaseous phase. This simplified high-resolution spectrum further revealed the slow conversion of nuclear spin symmetry from species E to species A in the host matrix, offering potential insight into nuclear spin conversion in astrophysical sources.