液氢平面低温冷冻靶的红外吸收谱

Infrared absorption of liquid-hydrogen planar cryotargets

利用自主研制的平面低温冷冻靶系统和低温红外光谱测量系统,测量低温条件下液态氢的红外吸收谱,得出基频Q1(0)吸收峰位在4237.3cm-1处,随着温度从19.75K降到16.75K,吸收峰位几乎没有发生移动,而吸收增强.基于量子力学的非简谐近似,研究了氢分子的振动频率,得出H2的红外吸收频率与实验结果值一致.

Using a home-made cryotarget system and infrared spectroscopy system,we measure the infrared absorption spectra of liquid hydrogen at low temperaturs.It is found that the fundamental vibration frequency of hydrogen molecule is 4237.3 cm-1.As liquid hydrogen cools from 19.75 K down to 16.75 K,the infrared absorption is enhanced.The vibration frequency of hydrogen molecules is calculated on the basis of non-harmonic approximation in order to explain the experimental ones.