Laser Ablation. Laser Ablation of Graphite in the Presence of a Magnetic Field.
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Optical emission spectroscopic studies were carried out on ablation plumes produced by laser ablation of graphite at 266nm and 1064nm in vacuum and in nitrogen gas atmosphere with or without a magnetic field of -0.1 T. In vacuum, in the presence of the magnetic field, the intensity distribution of C, C<SUP>+</SUP>, and C<SUP>2+</SUP> emission lines were varied remarkably and some of the emission lines originated from relatively higher excited states became obscure. In addition, C<SUB>2</SUB> Swan band emission appeared particularly during 1064nm laser ablation. These changes in emission spectra are interpreted by promotion of ionization of C and C<SUP>+</SUP>, formation of C<SUB>2</SUB>, and deexcitation of electronically excited states, resulting from enhanced collisions between ablated species due to cyclotron motions under the magnetic field. In nitrogen gas atmosphere, enhanced N<SUB>2</SUB> emission (2nd positive system) was observed and explained by electron-impact excitation of N<SUB>2</SUB> molecules.
- 社団法人 レーザー学会の論文
社団法人 レーザー学会 | 論文
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