Low-Background Laser Plasma Induced by Nd-YAG Laser at Low Pressures.

• Kurniawan Hendrik

  Applied Spectroscopy Laboratory, Graduate Program in Opto-Electrotechniques and Laser Application, The University of Indonesia, 4, Salemba Raya, Jakarta 10430, Indonesia

• Suyanto Herry

  Applied Spectroscopy Laboratory, Graduate Program in Opto-Electrotechniques and Laser Application, The University of Indonesia, 4, Salemba Raya, Jakarta 10430, Indonesia

• Kagawa Kiichiro

  Department of Physics, Faculty of Education and Regional Studies, Fukui University, Fukui 910-8507, Japan

• Maruyama Tadashi

  Wakasawan Energy Research Center, Tsuruga, Fukui, 914-0192, Japan

• Tjia May On

  Department of Physics, Faculty of Mathematics and Natural Sciences, Bandung Institute of Technology, 10, Ganesha, Bandung, Indonesia

抄録

An experimental study has been carried out on the dynamical process taking place in the secondary plasma generated by a Q-sw Nd-YAG laser (26 mJ, 1,064 nm, 8 ns) on a variety of metal samples at a reduced pressure of 0.5 Torr. It was found that light emission of plasma produced at such a low pressure was ascribable to collisions of ultrafast atoms with surrounding gas molecules, instead of the shock wave excitation mechanism proposed earlier for plasma generated at pressures around a few Torr or higher. This plasma exhibited excellent characteristics for spectrochemical applications because of its extremely low background emission. Using air as a surrounding gas, the background emission at 0.5 Torr was reduced by 10-fold compared to that at 1 Torr. It was also demonstrated that replacing air with helium as a surrounding gas further reduced the background emission by more than 10-fold. Temperature measurement performed by means of the Boltzmann two-line method showed that the average temperature of plasma generated below 1 Torr had the tendency to increase with decreasing pressure, contrary to the trend observed at higher pressures. It was also found that the propagation length of the emission front varied with time at constant velocity, which is significantly different from that predicted by the shock-wave model.

収録刊行物

• Japanese Journal of Applied Physics

  Japanese Journal of Applied Physics 40 (1), 188-194, 2001

  The Japan Society of Applied Physics

キーワード

• laser plasma
• low-pressure plasma
• collisional excitation
• shock wave plasma
• low background
• spectrochemical analysis

詳細情報

• CRID: 1390001206253396736
• NII論文ID: 10005096262
• NII論文ID: 210000049164
• NII論文ID: 130004527849
• NII書誌ID: AA10457675
• DOI: 10.1143/jjap.40.188
• ISSN: 13474065
• ISSN: 00214922
• NDL書誌ID: 5651511
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I5651511
• Web Site: https://iopscience.iop.org/article/10.1143/JJAP.40.188
• Web Site: https://iopscience.iop.org/article/10.1143/JJAP.40.188/pdf
• 本文言語コード: en
• データソース種別:
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