Spectroscopic study of REMPI for rotational temperature measurement in highly rarefied gas flows

Hideo Mori, Toshihiko Ishida, Yoshinori Aoki, Tomohide Niimi

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

5 Citations (Scopus)


A measurement technique of thermodynamic variables with high sensitivity is strongly demanded for analyses of highly rarefied gas flows. REMPI (Resonantly Enhanced Multiphoton Ionization) is a powerful optical tool because of its high sensitivity even in highly rarefied gas flows and ability to measure nonequilibrium among internal (translational, vibrational, and rotational) energy. In this study, to investigate fundamental properties of REMPI signal, the experimental apparatus of 2R N2-REMPI is constructed and the REMPI spectra are measured along the center line of a free molecular jet. A method of Boltzmann plot using the spectral lines of both O and P branches is proposed, determining electronic transition dipole moments in Hönl-London factors experimentally from the relative line strength of O and P branches. Then an effect of an experimental noise on a rotational temperature measured by the Boltzmann plot becomes smaller because the number of the lines used for the plot increases. By using the factors, simulated spectra agree well with experimental ones, suggesting feasibility of rotational temperature measurement by a spectral fitting.

Original languageEnglish
Title of host publicationRarefied Gas Dynamics
Subtitle of host publication22nd International Symposium
EditorsTimothy J. Bartel, Michael A. Gallis
PublisherAmerican Institute of Physics Inc.
Number of pages8
ISBN (Electronic)0735400253
Publication statusPublished - Aug 30 2001
Externally publishedYes
Event22nd International Symposium on Rarefied Gas Dynamics - Sydney, Australia
Duration: Jul 9 2000Jul 14 2000

Publication series

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


Other22nd International Symposium on Rarefied Gas Dynamics

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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