Spectroscopic study on the vibrational populations of N{sub 2} C {sup 3}{pi} and B {sup 3}{pi} states in a microwave nitrogen discharge

Journal Article · Mon Jan 15 00:00:00 EST 2007 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.2426975· OSTI ID:20982630

Sakamoto, Takeshi; Matsuura, Haruaki; Akatsuka, Hiroshi ^[1]

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1. Research Laboratory for Nuclear Reactors, Tokyo Institute of Technology, 2-12-1-N1-10, O-Okayama, Meguro-ku, Tokyo 152-8550 (Japan)

We measured the band spectra (first and second positive systems) of the nitrogen molecule to examine the vibrational and rotational temperatures of the C {sup 3}{pi} and B {sup 3}{pi} states by optical emission spectroscopy. We compared the experimentally measured and the calculated spectra to determine those temperatures of the generated plasma. We generated a microwave discharge nitrogen plasma in a cylindrical quartz tube (26 mm inside diameter) with a discharge pressure of 0.5-1.0 Torr. The microwave frequency was 2.45 GHz and the output power was set at 600 W. It was found that T{sub v}{approx_equal}0.5-0.7 eV and T{sub r}{approx_equal}0.07-0.15 eV at B {sup 3}{pi} (v=7, 8, and 9), whereas T{sub v}{approx_equal}0.65-0.9 eV and T{sub r}{approx_equal}0.06-0.16 eV at C {sup 3}{pi} (v=0 and 1). Both rotational temperatures obtained from first and second positive systems were in good agreement. We also compared the measured vibrational populations with theoretical calculations, in which vibrational distribution function at N{sub 2} X and electron energy distribution function are calculated self-consistently.

• OSTI ID: 20982630
• Journal Information: Journal of Applied Physics, Vol. 101, Issue 2; Other Information: DOI: 10.1063/1.2426975; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
BORON
CYLINDRICAL CONFIGURATION
DISTRIBUTION FUNCTIONS
ELECTRON TEMPERATURE
ELECTRONS
EMISSION SPECTROSCOPY
ENERGY SPECTRA
GHZ RANGE 01-100
HIGH-FREQUENCY DISCHARGES
MICROWAVE RADIATION
MILLI EV RANGE
NITROGEN
PLASMA
PLASMA DIAGNOSTICS
QUARTZ
ROTATIONAL STATES
VIBRATIONAL STATES