锂/锂二超音速喷嘴束。

Li/Li2 supersonic nozzle beam.

作者信息

Wu C Y, Crooks J B, Yang S C, Way K R, Stwalley W C

机构信息

Department of Chemistry, University of Iowa, Iowa City, IA 52242, USA.

出版信息

Rev Sci Instrum. 1978 Mar;49(3):380. doi: 10.1063/1.1135412.

DOI:10.1063/1.1135412

PMID:18699102

Abstract

The characterization of a lithium supersonic nozzle beam has been made using spectroscopic techniques. It is found that at a stagnation pressure of 5.3 kPa (40 Torr) and a nozzle throat diameter of 0.4 mm the ground state vibrational population of Li(2) can be described by a Boltzmann distribution with T(v)= (195+/-30) K. The rotational temperature is found to be T(r)= (70+/-20) K by band shape analysis. Measurements by quadrupole mass spectrometer indicate that approximately 10-mol. % Li(2) dimers are present far downstream for an oven body temperature of 1370 K in the supersonic nozzle expansion. This measured mole fraction is in agreement with the existing dimerization theory.

摘要

利用光谱技术对锂超声速喷嘴束进行了表征。结果发现，在滞止压力为5.3 kPa（40 Torr）且喷嘴喉部直径为0.4 mm时，Li(2)的基态振动布居可用T(v) = (195±30) K的玻尔兹曼分布来描述。通过谱带形状分析发现转动温度为T(r) = (70±20) K。四极质谱仪的测量表明，在超声速喷嘴膨胀过程中，当炉体温度为1370 K时，在下游很远处大约存在10摩尔%的Li(2)二聚体。该测量的摩尔分数与现有的二聚化理论相符。