Observation of X-ray spectra from nitrogen clusters irradiated with high-intensity ultrashort laser pulses |
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| Authors: | A. Sagisaka H. Honda K. Kondo H. Suzuki K. Nagashima T. Kawachi A. Nagashima Y. Kato H. Takuma |
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| Affiliation: | (1) Advanced Photon Research Center, Kansai Research Establishment, Japan Atomic Energy Research Institute, Umemidai 8-1, Kizu, Kyoto 619-0215, Japan (Fax: +81-774/71-3316, E-mail: sagisaka@apr.jaeri.go.jp), JP;(2) Center for Tsukuba Advanced Research Alliance (TARA), University of Tsukuba, Tennodai 1-1-1, Tsukuba, Ibaraki 305-8577, Japan, JP |
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| Abstract: | X-ray spectra from nitrogen clusters irradiated with ultrashort laser pulses are reported. The line spectra of H-like and He-like nitrogen ions have been observed by irradiation with 100 fs, 800 nm pulses at 7×1017 W/cm2 irradiance. The generation of highly charged ions of N6+ and N7+ is explained by the optical field-induced ionization and the subsequent collisional ionizations in the clusters. The He-δline has anomalously high brightness compared to other He-like lines. It is ascribed to charge exchange, which preferentially populates the n=5 level of N5+. Received: 7 October 1999 / Published online: 23 February 2000 |
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| Keywords: | PACS: 33.00 34.00 36.00 |
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