Journal
PHYSICS OF PLASMAS
Volume 28, Issue 7, Pages -Publisher
AIP Publishing
DOI: 10.1063/5.0049248
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Funding
- National Key Research and Development Program [2019YFA0307701]
- National Natural Science Foundation of China [11704145, 11974138, 11674128, 11504129, 11674124]
- Scientific Research Project of Jilin Provincial Department of Education during the 13th Five-year Plan Period [JJKH20190181KJ]
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This study experimentally investigates the characteristics of femtosecond laser-induced nitrogen fluorescence emission at different air pressures and observes the opposite variation of fluorescence signals from nitrogen molecule and molecular nitrogen ion as a function of air pressure. It is deduced that dissociative recombination is the main pathway for the production of the C-3 Pi(u) state of N-2. This research helps to elucidate the physical emission mechanism of femtosecond laser-induced nitrogen fluorescence emission.
In this paper, we experimentally investigate femtosecond laser-induced nitrogen fluorescence emission at different air pressures (0.1 Pa-100 kPa). The variation of nitrogen molecule (N-2) and molecular nitrogen ion (N-2(+)) characteristic fluorescence spectral lines' intensity as a function of air pressure is observed. When the air pressure is between 10 Pa and 100 kPa, the intensity of fluorescence signals from N-2(+) and N-2 shows opposite variation as a function of air pressure. We deduce that dissociative recombination is the main pathway for the production of the C-3 Pi(u) state of N-2. This research helps elucidate the physical emission mechanism of femtosecond laser-induced nitrogen fluorescence emission. Published under an exclusive license by AIP Publishing.
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