Emission Characteristics of Ca and Mg Atoms in Gas Plasma Induced by the Bombardment of Transversely Excited Atmospheric CO2 Laser at 1 atm

元データ 2012-08-25

概要

To study the mechanism of atomic excitation in gas plasma, a transversely excited atmospheric pressure (TEA) CO2 laser (750 mJ, 200 ns) was focused on a metal subtarget through a hole (2 mm in diameter) produced in a glass slide sample (1.5 mm in thickness); the glass slide sample was placed in close contact with a nickel metal plate, which functions as the metal subtarget. It was demonstrated that a strong gas plasma can be induced in various gases including He, N2, and CO2 and that plasma can be employed as the excitation source for spectrochemical analysis. It has been proved that, in He gas plasma, strong Ca ionic emissions (Ca II 393.3 nm and Ca II 373.7 nm) with a long lifetime can be observed regardless of excitation energy. On the other hand, in N2 and CO2 gases, the emissions are very weak and have a short lifetime. We assumed that, in He gas plasma, He metastable atoms play significant role in excitation. In the case of the Ca atom, the double ionization of Ca (Ca2+) is directly induced when a Ca atom collides with He metastable atoms through the Penning effect. The ion produced then recombines with an electron to produce an ionic excitation state, from which ionic emission is induced. In neutral Ca and Mg emissions, unique emission characteristics were observed in the He gas plasma case, namely, the triplet state is the main product and the singlet state is a minor product. This result can be explained by our proposed model.

著者

FUKUMOTO Ken-ichi Research Institute of Nuclear Engineering, University of Fukui
Khumaeni Ali Program Of Nuclear Power And Energy Safety Engineering Graduate School Of Engineering University Of
Lie Zener Program Of Nuclear Power And Energy Safety Engineering Graduate School Of Engineering University Of
Niki Hideaki Program Of Nuclear Power And Energy Safety Engineering Graduate School Of Engineering University Of
Kurniawan Koo Research Center of Maju Makmur Mandiri Foundation
Kagawa Kiichiro Research Institute Of Nuclear Engineering University Of Fukui
Lee Yong Depart. Of Oncology Yonsei Univ. Wonju College Of Medicine
Niki Hideaki Program of Nuclear Power and Energy Safety Engineering, Graduate School of Engineering, University of Fukui, Fukui 910-8507, Japan
Kurihara Kazuyoshi Department of Physics, Faculty of Education and Regional Studies, University of Fukui, Fukui 910-8507, Japan
Khumaeni Ali Program of Nuclear Power and Energy Safety Engineering, Graduate School of Engineering, University of Fukui, Fukui 910-8507, Japan
Fukumoto Ken-ichi Research Institute of Nuclear Engineering, University of Fukui, Fukui 910-8597, Japan
Lee Yong Department of Physics, Research Institute of Physics and Chemistry, Chonbuk National University, Chonju 561-756, Republic of Korea
Kagawa Kiichiro Research Institute of Electronics, Shizuoka University
Kagawa Kiichiro Research Institute of Nuclear Engineering, University of Fukui, Fukui 910-8597, Japan

関連論文

▼もっと見る