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ファイル | 記述 | サイズ | フォーマット | |
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PhysRevB.81.115442.pdf | 251.5 kB | Adobe PDF | 見る/開く |
タイトル: | Ion emission from a metal surface through a multiphoton process and optical field ionization |
著者: | Hashida, Masaki https://orcid.org/0000-0003-4834-0138 (unconfirmed) Namba, Shin Okamuro, Kiminori Tokita, Shigeki https://orcid.org/0000-0002-3177-5613 (unconfirmed) Sakabe, Shuji |
著者名の別形: | 橋田, 昌樹 |
発行日: | Mar-2010 |
出版者: | American Physical Society |
誌名: | Physical Review B |
巻: | 81 |
号: | 11 |
論文番号: | 115442 |
抄録: | In order to investigate the physics of ion emission under an intense optical field, the ions emitted from a laser-irradiated copper surface were studied by time-of-flight energy spectroscopy. The lowest laser fluence at which ions are emitted, F_{th,L}, is 0.028 J/cm[2], and two higher emission thresholds were identified at fluences of F_{th,M}=0.195 J/cm[2] and F_{th,H}=0.470 J/cm[2]. The relation between the number of emitted ions per pulse N_{i} and the laser fluence F was in good agreement with N_{i}∝F[4] for F_{th,L}−F_{th,M}, N_{i}∝F[3] for F_{th,M}−F_{th,H}, and N_{i}∝F[2] for ≥F_{th,H}. The dependence of ion production on laser energy fluence is explained well by multiphoton absorption and optical field ionization. Even at a low laser fluence such as 0.136 J/cm[2], the emitted ions have an energy of 30 eV, and the ion energy depends on the laser fluence (790 eV at 14.4 J/cm[2]). The laser fluence dependence of ion energy is reasonably well related to those of the interspaces of gratings that are self-organized on a metal surface by femtosecond laser pulses. |
著作権等: | © 2010 The American Physical Society. |
URI: | http://hdl.handle.net/2433/145967 |
DOI(出版社版): | 10.1103/PhysRevB.81.115442 |
出現コレクション: | 学術雑誌掲載論文等 |
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