Application of REMPI to highly rarefied gas flows

T. Niimi, Hideo Mori, T. Ishida, A. Takasu, K. Niwa

研究成果: ジャーナルへの寄稿Conference article

2 引用 (Scopus)

抄録

In this study, the experimental system for 2R+2 N2-REMPI (Resonantly Enhanced Multi-Photon Ionization) is established and applied to measurement of the rotational temperature in a supersonic free molecular nitrogen flow. In the 2R+2 N2 REMPI technique, nitrogen molecules are ionized by two steps from the ground state to the resonance state by 2 photons and from the resonance state to the ionization state by 2 photons. The nitrogen ions are detected as a signal and its spectra depending on the wavelength of an irradiated laser beam are analyzed to measure the rotational temperature. The new Boltzmann plot method using spectral lines belonging to multiple branches is proposed to measure the rotational temperature more precisely, also showing the feasibility of the temperature measurement by the best fitting of the theoretical spectra to the experimental one. There appear the non-equilibrium phenomena in the highly rarefied gas flows, such as the translational and rotational non-equilibrium and the rotational non-equilibrium. The non-Boltzmann distribution (strong non-equilibrium) of the rotational mode in the ground state is found in the free molecular nitrogen flow using the REMPI technique.

元の言語英語
ページ(範囲)256-261
ページ数6
ジャーナルICIASF Record, International Congress on Instrumentation in Aerospace Simulation Facilities
出版物ステータス出版済み - 1 1 2001
外部発表Yes
イベント19th International Congress on Instrumentation in Aerospace Simulation Facilities (ICIASF 2001) - Cleveland, OH, 米国
継続期間: 8 27 20018 30 2001

Fingerprint

rarefied gases
gas flow
Flow of gases
Nitrogen
nitrogen
Photons
photons
Ground state
Ionization
ionization
ground state
nitrogen ions
temperature
line spectra
temperature measurement
plots
Temperature measurement
laser beams
Temperature
Laser beams

All Science Journal Classification (ASJC) codes

  • Instrumentation
  • Aerospace Engineering
  • Condensed Matter Physics

これを引用

Application of REMPI to highly rarefied gas flows. / Niimi, T.; Mori, Hideo; Ishida, T.; Takasu, A.; Niwa, K.

:: ICIASF Record, International Congress on Instrumentation in Aerospace Simulation Facilities, 01.01.2001, p. 256-261.

研究成果: ジャーナルへの寄稿Conference article

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title = "Application of REMPI to highly rarefied gas flows",
abstract = "In this study, the experimental system for 2R+2 N2-REMPI (Resonantly Enhanced Multi-Photon Ionization) is established and applied to measurement of the rotational temperature in a supersonic free molecular nitrogen flow. In the 2R+2 N2 REMPI technique, nitrogen molecules are ionized by two steps from the ground state to the resonance state by 2 photons and from the resonance state to the ionization state by 2 photons. The nitrogen ions are detected as a signal and its spectra depending on the wavelength of an irradiated laser beam are analyzed to measure the rotational temperature. The new Boltzmann plot method using spectral lines belonging to multiple branches is proposed to measure the rotational temperature more precisely, also showing the feasibility of the temperature measurement by the best fitting of the theoretical spectra to the experimental one. There appear the non-equilibrium phenomena in the highly rarefied gas flows, such as the translational and rotational non-equilibrium and the rotational non-equilibrium. The non-Boltzmann distribution (strong non-equilibrium) of the rotational mode in the ground state is found in the free molecular nitrogen flow using the REMPI technique.",
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T1 - Application of REMPI to highly rarefied gas flows

AU - Niimi, T.

AU - Mori, Hideo

AU - Ishida, T.

AU - Takasu, A.

AU - Niwa, K.

PY - 2001/1/1

Y1 - 2001/1/1

N2 - In this study, the experimental system for 2R+2 N2-REMPI (Resonantly Enhanced Multi-Photon Ionization) is established and applied to measurement of the rotational temperature in a supersonic free molecular nitrogen flow. In the 2R+2 N2 REMPI technique, nitrogen molecules are ionized by two steps from the ground state to the resonance state by 2 photons and from the resonance state to the ionization state by 2 photons. The nitrogen ions are detected as a signal and its spectra depending on the wavelength of an irradiated laser beam are analyzed to measure the rotational temperature. The new Boltzmann plot method using spectral lines belonging to multiple branches is proposed to measure the rotational temperature more precisely, also showing the feasibility of the temperature measurement by the best fitting of the theoretical spectra to the experimental one. There appear the non-equilibrium phenomena in the highly rarefied gas flows, such as the translational and rotational non-equilibrium and the rotational non-equilibrium. The non-Boltzmann distribution (strong non-equilibrium) of the rotational mode in the ground state is found in the free molecular nitrogen flow using the REMPI technique.

AB - In this study, the experimental system for 2R+2 N2-REMPI (Resonantly Enhanced Multi-Photon Ionization) is established and applied to measurement of the rotational temperature in a supersonic free molecular nitrogen flow. In the 2R+2 N2 REMPI technique, nitrogen molecules are ionized by two steps from the ground state to the resonance state by 2 photons and from the resonance state to the ionization state by 2 photons. The nitrogen ions are detected as a signal and its spectra depending on the wavelength of an irradiated laser beam are analyzed to measure the rotational temperature. The new Boltzmann plot method using spectral lines belonging to multiple branches is proposed to measure the rotational temperature more precisely, also showing the feasibility of the temperature measurement by the best fitting of the theoretical spectra to the experimental one. There appear the non-equilibrium phenomena in the highly rarefied gas flows, such as the translational and rotational non-equilibrium and the rotational non-equilibrium. The non-Boltzmann distribution (strong non-equilibrium) of the rotational mode in the ground state is found in the free molecular nitrogen flow using the REMPI technique.

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