Signal enhancement of neutral He emission lines by fast electron bombardment of laser-induced He plasma
Source abstract
Abstract
A time-resolved spectroscopic study is performed on the enhancement signals of He gas plasma emission using nanosecond (ns) and picosecond (ps) lasers in an orthogonal configuration. The ns laser is used for the He gas plasma generation and the ps laser is employed for the ejection of fast electrons from a metal target, which serves to excite subsequently the He atoms in the plasma. The study is focused on the most dominant He I 587.6 nm and He I 667.8 nm emission lines suggested to be responsible for the He-assisted excitation (HAE) mechanism. The time-dependent intensity enhancements induced by the fast electrons generated with a series of delayed ps laser ablations are deduced from the intensity time profiles of both He emission lines. The results clearly lead to the conclusion that the metastable excited triplet He atoms are actually the species overwhelmingly produced during the recombination process in the ns laser-induced He gas plasma. These metastable He atoms are believed to serve as the major energy source for the delayed excitation of analyte atoms in ns laser-induced breakdown spectroscopy (LIBS) using He ambient gas.
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Research context
OpenAlex topics: Laser-induced spectroscopy and plasma · Analytical chemistry methods development · Atomic and Molecular Physics
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Udayana University 1 Department of Physics, Faculty of Mathematics and Natural Sciences, , Kampus Bukit Jimbaran, Denpasar 80361, Bali, Indonesia
University of Pelita Harapan 2 Department of Electrical Engineering, , 1100 M.H. Thamrin Boulevard, Lippo Village, Tangerang 15811, Indonesia
Bina Nusantara University 3 Department of Computer Engineering, , 9 K.H. Syahdan, Jakarta 14810, Indonesia
Jakarta State University 4 Department of Physics, Faculty of Mathematics and Natural Sciences, , Rawamangun, Jakarta 12440, Indonesia
Syiah Kuala University 5 Department of Chemistry, Faculty of Mathematics and Natural Sciences, , Darussalam, Banda Aceh 23111, NAD, Indonesia
Research Center of Maju Makmur Mandiri Foundation 6 , 40 Srengseng Raya, Kembangan, Jakarta Barat 11630, Indonesia
Syiah Kuala University 7 Department of Physics, Faculty of Mathematics and Natural Sciences, , Darussalam, Banda Aceh 23111, NAD, Indonesia
Faculty of Mathematics and Natural Sciences 8 Physics of Magnetism and Photonics Group, , Bandung Institute of Technology, 10 Ganesha,Bandung 40132, Indonesia
Fukui Science Education Academy 9 , Takagi Chuo 2 chome, Fukui 910-0804 , Japan
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