Kinetic model of gas heating of laser-produced plasmas by CO2 laser in atmospheric air

Akihiko Takahashi; Kiyoto Nishijima

doi:10.1143/JJAP.37.313

Kinetic model of gas heating of laser-produced plasmas by CO₂ laser in atmospheric air

Akihiko Takahashi, Kiyoto Nishijima

Division of medical Quantum Science

Research output: Contribution to journal › Article › peer-review

10 Citations (Scopus)

Abstract

A kinetic model was developed for theoretical investigations on laser-induced breakdown and gas heating in an N₂/O₂ gas mixture. This model calculates particle densities, electron energy, electron rate coefficient, vibrational temperature, gas temperature, and the other plasma parameters. The gas temperature was calculated from the potential differences in all chemical reactions. The analyses were performed for an N₂/O₂ mixture of 1 atm irradiated with a O₂ laser. The results show that the electron density of 10²³ m^-3 is the threshold of electrical breakdown and gas heating, and that the electron-ion recombination and the collisional de-excitation of vibrationally excited N₂(X¹Σ_g⁺) have a strong effect on the gas heating.

Original language	English
Pages (from-to)	313-319
Number of pages	7
Journal	Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Volume	37
Issue number	1
DOIs	https://doi.org/10.1143/JJAP.37.313
Publication status	Published - Jan 1998

All Science Journal Classification (ASJC) codes

Engineering(all)
Physics and Astronomy(all)

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title = "Kinetic model of gas heating of laser-produced plasmas by CO2 laser in atmospheric air",

abstract = "A kinetic model was developed for theoretical investigations on laser-induced breakdown and gas heating in an N2/O2 gas mixture. This model calculates particle densities, electron energy, electron rate coefficient, vibrational temperature, gas temperature, and the other plasma parameters. The gas temperature was calculated from the potential differences in all chemical reactions. The analyses were performed for an N2/O2 mixture of 1 atm irradiated with a O2 laser. The results show that the electron density of 1023 m-3 is the threshold of electrical breakdown and gas heating, and that the electron-ion recombination and the collisional de-excitation of vibrationally excited N2(X1Σg+) have a strong effect on the gas heating.",

author = "Akihiko Takahashi and Kiyoto Nishijima",

year = "1998",

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AB - A kinetic model was developed for theoretical investigations on laser-induced breakdown and gas heating in an N2/O2 gas mixture. This model calculates particle densities, electron energy, electron rate coefficient, vibrational temperature, gas temperature, and the other plasma parameters. The gas temperature was calculated from the potential differences in all chemical reactions. The analyses were performed for an N2/O2 mixture of 1 atm irradiated with a O2 laser. The results show that the electron density of 1023 m-3 is the threshold of electrical breakdown and gas heating, and that the electron-ion recombination and the collisional de-excitation of vibrationally excited N2(X1Σg+) have a strong effect on the gas heating.

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