Rotational Excitations in Solid Hydrogen

固体氢的最低压力相由分子氢的六方紧密堆积结构组成。X射线和中子研究可以探测到原子核的平均位置，但定向行为要复杂得多。在最低压力下的拉曼光谱表明，这些分子具有自由旋翼行为。然而，当压力增加时，单个转动能级的识别变得更加复杂，因为这些低频带显著地展宽。本项目旨在发展受抑制量子转子的拉曼信号理论。将预测的光谱与实验数据进行比较，将为了解加压下氢的固相性质提供新的见解。

The lowest pressure phase of solid hydrogen comprises a hexagonally close packed structure of molecular hydrogen. X-ray and neutron studies can detect the mean nuclear position, but the orientational behaviour is more complicated. Raman spectroscopy at the lowest pressures, shows that the molecules adopt free rotor behaviour. However when pressure increases the identification of the single rotational levels becomes more complicated, as these low frequency bands significantly broaden. This project aims to develop the theory for the Raman signal from an inhibited quantum rotor. Comparing the predicted spectra with experimental data will provide new insight into the nature of the solid phases of hydrogen under pressure.