Abstract
Under optically thin conditions, the core of emission-line profiles of the resonance lines ( 1 P 1- 1 S 0 transition) of Sr and Ba have been measured with a pressure-scanned Fabry-Pe´rot interferometer in a laminar, pre-mixed, shielded air-acetylene flame at 1 atm ( T = 2275 K). Under identical experimental conditions, where Doppler and collisional broadening are almost equally important, these profiles are compared with Zeeman-scanned absorption profiles of the same resonance lines. The values for the full width at one-half maximum (FWHM) and the shift of the emission and absorption core profiles for Sr and Ba proved to be identical within an experimental scatter of 5 and 20%, respectively. Obviously the radiation emitted by the Sr and Ba atoms in the flame is thermal, which means that the spectral shape of the line is consistent with Maxwell-Boltzmann equilibrium.
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