摘要:
High-frequency discharges in mercury vapor have been excited by valve oscillators, and a comparison made of spectra obtained by the use of a purely electrodeless method with those excited by external electrodes. Temperatures ranged from 100° to over 250 °C., and the use of four wave-lengths of approximate values 5, 35, 75, and 200 m. made it possible at the same time to examine possible changes in the spectrum arising from changing frequencies. It was found that, with the exception of the highest frequency, external electrodes excitation was more effective for the emission of arc and of spark lines, whereas diffuse bands and regions of continuous spectra could be separated from lines at higher pressures somewhat better by electrodeless excitation.Evidence is given that the discharge obtained at a frequency of 60 megacycles differs from that obtained at the lower frequencies. At a low vapor pressure a discharge, which is characterized by great brilliance and the absence of spark lines, is obtained with the highest frequency. There is little to choose between the two types of excitation. An explanation is suggested for the difference due to frequency.
ISSN:1923-4287
DOI:10.1139/cjr36a-023
出版商:NRC Research Press
年代:1936
数据来源: NRC