Spectroscopic investigation of wave driven microwave plasmas

Journal Article · Sun Nov 15 00:00:00 EST 2009 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.3259429· OSTI ID:21361918

Wijtvliet, R ^[1]; Felizardo, E; Tatarova, E; Dias, F M; Ferreira, C M ^[1]; Nijdam, S; Veldhuizen, E V; Kroesen, G ^[2]

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1. Instituto de Plasmas e Fusao Nuclear, Instituto Superior Tecnico, 1049-001 Lisboa (Portugal)
2. Eindhoven University of Technology, Eindhoven (Netherlands)

Large H atom line broadening was found throughout the volume of surface wave generated He-H{sub 2} and H{sub 2} microwave plasmas at low pressures. The measured Doppler temperatures corresponding to the H{sub b}eta, H{sub g}amma, H{sub d}elta, H{sub e}psilon, and H{sub z}eta line profiles were found to be higher than the rotational temperature of the hydrogen molecular Fulcher-alpha band and the Doppler temperature of the 667.1 nm singlet He line. No excessive broadening has been found. The Lorentzian and Gaussian widths as determined by fitting the spectral lines with a Voigt profile increase with the principal quantum number of the upper level. In contrast, no such dependence for the Gaussian width has been observed in an Ar-H{sub 2} discharge. No population inversion has been observed from measurements of the relative intensities of transitions within the Balmer series.

• OSTI ID: 21361918
• Journal Information: Journal of Applied Physics, Vol. 106, Issue 10; Other Information: DOI: 10.1063/1.3259429; (c) 2009 American Institute of Physics; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ARGON
DOPPLER BROADENING
HELIUM
HIGH-FREQUENCY DISCHARGES
HYDROGEN
MICROWAVE RADIATION
PLASMA
POPULATION INVERSION
WAVE PROPAGATION
ELECTRIC DISCHARGES
ELECTROMAGNETIC RADIATION
ELEMENTS
FLUIDS
GASES
LINE BROADENING
NONMETALS
RADIATIONS
RARE GASES