六氟化铀低温红外光谱

INFRARED ABSORPTION SPECTRUM OF URANIUM HEXAFLUORIDE AT LOWER TEMPERATURE

自40年代,六氟化袖(UF。)的红外和拉曼光谱已有很多研究者作了大量工作.70年代中期随着激光技术用于铀同位素的分离,并取得了一些令人鼓舞的进展,因此UF。红外吸收光谱的研究,特别是对其吸收带结构的研究引起了人们重视。新的实验结果时有报道。除对基频进行更精确地测定和确定更多的组频、倍频位置外,还在228K和256K温度下测定了铀同位素频率位移(△;:,八,,‘);利用低温喷咀技术在40K一50K温度下对。

In this paper influence of temperature on distribution of rotational level of molecule is discussed. The P- and R-branches spacing of UF6 v3 band is estimated at different temperatures and demonstrated by experiments. Frequency shift of 238UF6 v3 band from 228K to 300K and frequency values of 138UF, and 235UF6 v3 band at 223K are measured. In addition the uranium isotope shift obtained is 0.6 cm-1. Purity of 235UF6 sample and of 238UF, sample used is 90% and 99.4% respectively.