Experimental study of rotational nonequilibrium in low density N 2 jets using REMPI

Tomohide Niimi, Hideo Mori, Isao Akiyama, Takumi Tsuzuki

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

In the present study, we measure the rotational population in supersonic nitrogen free jets using a REMPI (resonantly enhanced multi-photon ionization) method, which is not influenced by secondary electrons, unlike an electron beam method. Nitrogen ions are detected as a REMPI signal and its spectra depending on the wavelength of an irradiated laser beam are analyzed to measure rotational temperature through the Boltzmann plot. Nitrogen gas expands into a vacuum chamber from a sonic nozzle with a D=0.50mm diameter, setting P0D (P0: source pressure), depending inversely on the nozzle Knudsen number, at 15 Torr-mm or lower. In the case of P0D=15.0, the rotational temperature distribution along the centerline of the jet, measured by Boltzmann plot, coincides with Marrone's data measured by electron beam fluorescence, and the rotational relaxation rate Zr calculated by the relaxation equation results in 1.3. However, the non-Boltzmann rotational distribution appears evidently in the supersonic free molecular nitrogen flows for P 0D≤15 Torr-mm and as a decrease in the P0D, the deviation from the Boltzmann distribution and the partial freezing of the population arise more upstream.

Original languageEnglish
Title of host publicationRAREFIED GAS DYNAMICS
Subtitle of host publication24th International Symposium on Rarefied Gas Dynamics, RGD24
Pages1025-1030
Number of pages6
DOIs
Publication statusPublished - May 16 2005
Event24th International Symposium on Rarefied Gas Dynamics, RGD24 - Bari, Italy
Duration: Jul 10 2004Jul 16 2004

Publication series

NameAIP Conference Proceedings
Volume762
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Other

Other24th International Symposium on Rarefied Gas Dynamics, RGD24
CountryItaly
CityBari
Period7/10/047/16/04

Fingerprint

nitrogen
ionization
photons
sonic nozzles
plots
electron beams
Knudsen flow
Boltzmann distribution
free jets
nitrogen ions
vacuum chambers
upstream
freezing
nozzles
temperature distribution
laser beams
deviation
fluorescence
gases
wavelengths

All Science Journal Classification (ASJC) codes

  • Ecology, Evolution, Behavior and Systematics
  • Ecology
  • Plant Science
  • Physics and Astronomy(all)
  • Nature and Landscape Conservation

Cite this

Niimi, T., Mori, H., Akiyama, I., & Tsuzuki, T. (2005). Experimental study of rotational nonequilibrium in low density N 2 jets using REMPI. In RAREFIED GAS DYNAMICS: 24th International Symposium on Rarefied Gas Dynamics, RGD24 (pp. 1025-1030). (AIP Conference Proceedings; Vol. 762). https://doi.org/10.1063/1.1941669

Experimental study of rotational nonequilibrium in low density N 2 jets using REMPI. / Niimi, Tomohide; Mori, Hideo; Akiyama, Isao; Tsuzuki, Takumi.

RAREFIED GAS DYNAMICS: 24th International Symposium on Rarefied Gas Dynamics, RGD24. 2005. p. 1025-1030 (AIP Conference Proceedings; Vol. 762).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Niimi, T, Mori, H, Akiyama, I & Tsuzuki, T 2005, Experimental study of rotational nonequilibrium in low density N 2 jets using REMPI. in RAREFIED GAS DYNAMICS: 24th International Symposium on Rarefied Gas Dynamics, RGD24. AIP Conference Proceedings, vol. 762, pp. 1025-1030, 24th International Symposium on Rarefied Gas Dynamics, RGD24, Bari, Italy, 7/10/04. https://doi.org/10.1063/1.1941669
Niimi T, Mori H, Akiyama I, Tsuzuki T. Experimental study of rotational nonequilibrium in low density N 2 jets using REMPI. In RAREFIED GAS DYNAMICS: 24th International Symposium on Rarefied Gas Dynamics, RGD24. 2005. p. 1025-1030. (AIP Conference Proceedings). https://doi.org/10.1063/1.1941669
Niimi, Tomohide ; Mori, Hideo ; Akiyama, Isao ; Tsuzuki, Takumi. / Experimental study of rotational nonequilibrium in low density N 2 jets using REMPI. RAREFIED GAS DYNAMICS: 24th International Symposium on Rarefied Gas Dynamics, RGD24. 2005. pp. 1025-1030 (AIP Conference Proceedings).
@inproceedings{a3694a0d0f554bcb8e578b7b7b2fabc5,
title = "Experimental study of rotational nonequilibrium in low density N 2 jets using REMPI",
abstract = "In the present study, we measure the rotational population in supersonic nitrogen free jets using a REMPI (resonantly enhanced multi-photon ionization) method, which is not influenced by secondary electrons, unlike an electron beam method. Nitrogen ions are detected as a REMPI signal and its spectra depending on the wavelength of an irradiated laser beam are analyzed to measure rotational temperature through the Boltzmann plot. Nitrogen gas expands into a vacuum chamber from a sonic nozzle with a D=0.50mm diameter, setting P0D (P0: source pressure), depending inversely on the nozzle Knudsen number, at 15 Torr-mm or lower. In the case of P0D=15.0, the rotational temperature distribution along the centerline of the jet, measured by Boltzmann plot, coincides with Marrone's data measured by electron beam fluorescence, and the rotational relaxation rate Zr calculated by the relaxation equation results in 1.3. However, the non-Boltzmann rotational distribution appears evidently in the supersonic free molecular nitrogen flows for P 0D≤15 Torr-mm and as a decrease in the P0D, the deviation from the Boltzmann distribution and the partial freezing of the population arise more upstream.",
author = "Tomohide Niimi and Hideo Mori and Isao Akiyama and Takumi Tsuzuki",
year = "2005",
month = "5",
day = "16",
doi = "10.1063/1.1941669",
language = "English",
isbn = "0735402477",
series = "AIP Conference Proceedings",
pages = "1025--1030",
booktitle = "RAREFIED GAS DYNAMICS",

}

TY - GEN

T1 - Experimental study of rotational nonequilibrium in low density N 2 jets using REMPI

AU - Niimi, Tomohide

AU - Mori, Hideo

AU - Akiyama, Isao

AU - Tsuzuki, Takumi

PY - 2005/5/16

Y1 - 2005/5/16

N2 - In the present study, we measure the rotational population in supersonic nitrogen free jets using a REMPI (resonantly enhanced multi-photon ionization) method, which is not influenced by secondary electrons, unlike an electron beam method. Nitrogen ions are detected as a REMPI signal and its spectra depending on the wavelength of an irradiated laser beam are analyzed to measure rotational temperature through the Boltzmann plot. Nitrogen gas expands into a vacuum chamber from a sonic nozzle with a D=0.50mm diameter, setting P0D (P0: source pressure), depending inversely on the nozzle Knudsen number, at 15 Torr-mm or lower. In the case of P0D=15.0, the rotational temperature distribution along the centerline of the jet, measured by Boltzmann plot, coincides with Marrone's data measured by electron beam fluorescence, and the rotational relaxation rate Zr calculated by the relaxation equation results in 1.3. However, the non-Boltzmann rotational distribution appears evidently in the supersonic free molecular nitrogen flows for P 0D≤15 Torr-mm and as a decrease in the P0D, the deviation from the Boltzmann distribution and the partial freezing of the population arise more upstream.

AB - In the present study, we measure the rotational population in supersonic nitrogen free jets using a REMPI (resonantly enhanced multi-photon ionization) method, which is not influenced by secondary electrons, unlike an electron beam method. Nitrogen ions are detected as a REMPI signal and its spectra depending on the wavelength of an irradiated laser beam are analyzed to measure rotational temperature through the Boltzmann plot. Nitrogen gas expands into a vacuum chamber from a sonic nozzle with a D=0.50mm diameter, setting P0D (P0: source pressure), depending inversely on the nozzle Knudsen number, at 15 Torr-mm or lower. In the case of P0D=15.0, the rotational temperature distribution along the centerline of the jet, measured by Boltzmann plot, coincides with Marrone's data measured by electron beam fluorescence, and the rotational relaxation rate Zr calculated by the relaxation equation results in 1.3. However, the non-Boltzmann rotational distribution appears evidently in the supersonic free molecular nitrogen flows for P 0D≤15 Torr-mm and as a decrease in the P0D, the deviation from the Boltzmann distribution and the partial freezing of the population arise more upstream.

UR - http://www.scopus.com/inward/record.url?scp=33749020318&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=33749020318&partnerID=8YFLogxK

U2 - 10.1063/1.1941669

DO - 10.1063/1.1941669

M3 - Conference contribution

AN - SCOPUS:33749020318

SN - 0735402477

SN - 9780735402478

T3 - AIP Conference Proceedings

SP - 1025

EP - 1030

BT - RAREFIED GAS DYNAMICS

ER -