Spectral-Line Profiles for a Fast-Ion-Beam Source*
- 1 July 1967
- journal article
- Published by Optica Publishing Group in Journal of the Optical Society of America
- Vol. 57 (7) , 878
- https://doi.org/10.1364/josa.57.000878
Abstract
When fast, foil-excited ions are used as a light source, the resulting spectral lines are Doppler broadened because the radiating particles are moving and the spectrograph has a finite acceptance angle. An exact expression has been obtained for the line profile produced by a stigmatic spectrograph without vignetting. For β2 < <1, the irradiance is I(λ) ~ {¼θ2-[(λ0-λ)/βλ0]2}½ when the square root is real, and zero otherwise. Theta is the spectrograph’s acceptance angle. The line width at half maximum is Δλ~0.866 θβλ0. Vignetting causes the line shape to deviate from the theoretical profile. For a Meinel-type spectrograph, this effect can give doubled line images.Keywords
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