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Rotational Relaxation Analysis and Simulation of REMPI Spectra for Molecule Nitrogen

Nazari, B.K. and Ishida, T. and Mori, H. and Niimi, T. (1998) Rotational Relaxation Analysis and Simulation of REMPI Spectra for Molecule Nitrogen. Other. EM 9801.

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Abstract

The new DLR-High Vacuum Test Facility STG enables an experimental investigation of typical thruster plumes as prerequisite to determine disturbance effects of thruster firing like e.g. perturbing forces and moments, excessive heat loads, and contamination. Its main feature, a large liquid helium-driven cryopump allows the undisturbed plume gas expansion into the highly rarefied regime including the backflow. Because of the very low number densities in these regions, as an appropriate measurement technique the highly sensitive spectroscopie method REMPI (Resonance Enhanced Multi-Photon Ionization) is applied to obtain multiphoton spectra. This method delivers a precise determination of the most important plume flow characteristics, namely the temperature, the density, and gas velocity. In the first part of this study, the analytical technique of Gallagher and Fenn [?] is used to determine the characteristic rotational relaxation rate for nitrogen. The rates will then be discussed with those obtained by other methods. Further, a comparison between the experimental rotational temperature data measured in the STG and the analytical results will be carried out. In the second part, the simulation of the REMPI spectra is extended to consider the broadening of each absorption line including Doppler and collision broadening.

Document Type:Monograph (Other)
Additional Information: LIDO-Berichtsjahr=1999,
Title:Rotational Relaxation Analysis and Simulation of REMPI Spectra for Molecule Nitrogen
Authors:
AuthorsInstitution or Email of Authors
Nazari, B.K.UNSPECIFIED
Ishida, T.Nagoya University, Japan
Mori, H.Nagoya University, Japan
Niimi, T.Nagoya University, Japan
Date:1998
Status:Published
Keywords:STG, REMPI, Rotational Relaxation Analysis, Simulation of REMPI Spectra
Institution:Nagoya University
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W RP - Raumtransport
DLR - Research area:Space
DLR - Program:W RP - Raumtransport
DLR - Research theme (Project):UNSPECIFIED
Location: Köln-Porz , Braunschweig , Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Institut für Strömungsmechanik
Deposited By: elib DLR-Beauftragter
Deposited On:16 Sep 2005
Last Modified:14 Jan 2010 20:26

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