학술논문
He/H2O(95.4ppm)混合ガスの電離係数測定 / Measurement of Ionization Coefficients in He/H2O (95.4ppm) Mixture
Document Type
Journal Article
Author
Source
電気学会論文誌Ａ（基礎・材料・共通部門誌） / IEEJ Transactions on Fundamentals and Materials. 2022, 142(3):80
Subject
Language
Japanese
ISSN
0385-4205
1347-5533
1347-5533
Abstract
Measurements of the first and second ionization coefficients α and γT in He/H2O (95.4 ppm) mixture are carried out using a steady state Townsend method. Observed ionized multiplication currents are analyzed by Nakamura's plot to determine both of the ionization coefficients. The obtained first ionization coefficient in the mixture is large compared with those of helium and water molecule in the range of the reduced electric field E/N≦1131 Td (E/p0≦400 V/cm Torr) affected by Penning ionization between the metastable excited He atoms and H2O molecules.Therefore, it is validated that the Penning ionization is formed in the mixture and the related behaviors of the metastable excited He atoms He(23S1) and He(21S0) are also discussed in this paper.