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Resonant electron impact excitation of highly charged Fe ions studied with a compact electron beam ion trap |
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| Authors: | Masashi Monobe Hiroyuki A Sakaue Daiji Kato Izumi Murakami Hirohisa Hara Tetsuya Watanabe Nobuyuki Nakamura |
| Institution: | 1. Institute for Laser Science, The University of Electro-Communications, Tokyo, Japan;2. Department of Helical Plasma Research, National Institute for Fusion Science, Gifu, Japan;3. Department of Helical Plasma Research, National Institute for Fusion Science, Gifu, Japan
Department of Advanced Energy Engineering Science, Kyushu University, Fukuoka, Japan;4. National Astronomical Observatory of Japan, Tokyo, Japan Department of Astronomical Science, The Graduate University for Advanced Studies, SOKENDAI, Tokyo, Japan |
| Abstract: | We present extreme ultraviolet spectra of 3s3p–3s3d transitions in Fe14+ observed with a compact electron beam ion trap. The contributions of indirect excitation via a metastable state and resonant excitation are studied by observing the electron energy dependence of the spectra for the energy range of 60–210 eV. The results indicate that the 3s3d 1D2 level is directly excited from the 3s2 ground state whereas the 3s3d 3D3 level has a large contribution of the indirect excitation via the 3s3p 3P2 metastable state. Comparisons with the theoretical excitation cross sections including MNn resonant excitations show good qualitative agreement with the experimental results for the electron energy dependent features. |
| Keywords: | electron beam ion trap extreme ultraviolet spectra highly charged iron ions indirect excitation resonant excitation |