Anomalous broadening of the N/sub 2//sup +/ first negative band system

Conference · Thu Jan 01 04:00:00 EST 1976

OSTI ID:7342799

Robben, F; Cattolica, R; Coe, D; Talbot, L

Analysis of the fluorescence excited by a high energy electron beam has become a standard technique for measurement of density, rotational temperature of nitrogen, and translational temperature of helium and argon in rarefied gas dynamics. To obtain translational temperature the Doppler broadening of the fluorescence is determined by measuring the spectral line shape with a Fabry-Perot interferometer. To apply this technique to nitrogen a single rotational line must be selected from the band spectrum for analysis by the Fabry-Perot interferometer. As supported by extensive additional measurements, there is an anomalous broadening of the rotational lines of the N/sub 2//sup +/ first negative band system with a width equivalent to about a 70/sup 0/K translational temperature of nitrogen. It appears that the line width of approximately 0.03 cm/sup -1/ is an inherent property of this nitrogen band when excited by electron impact directly from the ground state.

• Research Organization: Sandia Labs., Albuquerque, N.Mex. (USA)
• OSTI ID: 7342799
• Report Number(s): SAND-76-8617; CONF-760710-1
• Country of Publication: United States
• Language: English

Related Subjects

640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
COLLISIONS
CRYOGENIC FLUIDS
ELECTRON COLLISIONS
ELECTRON-MOLECULE COLLISIONS
ELEMENTS
EMISSION SPECTROSCOPY
ENERGY LEVELS
EXCITED STATES
FLUIDS
FLUORESCENCE SPECTROSCOPY
IONIZATION
LINE BROADENING
LINE WIDTHS
MOLECULE COLLISIONS
NITROGEN
NONMETALS
ROTATIONAL STATES
SPECTROSCOPY