Spectroscopic observations : lithium and cœsium

Author:

Abstract

The present communication deals with a further study of the absorption spectra of the vapours of lithium and cœsium. These spectra were investigated, and the results communicated at the beginning of last year to the Royal Society. The present account deals with an extension of the principal series lines for the two metals, and a more detailed examination of the expression of the wave-lengths by a formula, as well as an investigation of the broadening effect in a pair of lines with increase of density of the vapour of cæsium. We shall deal first of all with the lithium spectrum. As has been remarked before, lithium vapour presents some difficulties, because of the high temperature required and the action of the vapour in this condition on the material of the containing vessel, but this difficulty can be surmounted by the use of a double steel tube and a large quantity of lithium. With the tube at a bright red heat, a dense enough vapour is produced to show in transmitted light a large number of the principal series lines ; the number that can be observed depends, I am convinced, only on the resolving power of the spectrograph used to investigate them. With the instrument at my disposal, I have been able to measure 41 of these lines, and I think in this case the resolution has been pushed as far as practicable, the last few lines being separated by only about 0·2 Ångström unit. Fig. 1, Plate 9, shows the absorption lines up to No. 25. The finer lines after this do not appear in the reproduction.

Publisher

The Royal Society

Subject

General Medicine

Cited by 4 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

同舟云学术

1.学者识别学者识别

2.学术分析学术分析

3.人才评估人才评估

"同舟云学术"是以全球学者为主线,采集、加工和组织学术论文而形成的新型学术文献查询和分析系统,可以对全球学者进行文献检索和人才价值评估。用户可以通过关注某些学科领域的顶尖人物而持续追踪该领域的学科进展和研究前沿。经过近期的数据扩容,当前同舟云学术共收录了国内外主流学术期刊6万余种,收集的期刊论文及会议论文总量共计约1.5亿篇,并以每天添加12000余篇中外论文的速度递增。我们也可以为用户提供个性化、定制化的学者数据。欢迎来电咨询!咨询电话:010-8811{复制后删除}0370

www.globalauthorid.com

TOP

Copyright © 2019-2024 北京同舟云网络信息技术有限公司
京公网安备11010802033243号  京ICP备18003416号-3