Topic
Doppler broadening
About: Doppler broadening is a research topic. Over the lifetime, 5509 publications have been published within this topic receiving 92552 citations.
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TL;DR: In this paper, a rigorous theoretical derivation of the spectrum width observed with short dwell times reveals that the sum cannot strictly be taken for the variances associated with various spectral broadening mechanisms and that an added-term coupling shear with turbulence is needed.
Abstract: Contrary to accepted usage, the second central moment of the Doppler spectrum is not the sum of the second central moments of individual spectral broadening mechanisms. A rigorous theoretical derivation of the spectrum width observed with short dwell times reveals that the sum cannot strictly be taken for the variances associated with various spectral broadening mechanisms and that an added-term coupling shear with turbulence is needed. Furthermore, shear and antenna rotation are coupled. The theoretical expressions derived herein apply to radars with fixed or scanning beams.
28 citations
TL;DR: In this article, a high-intensity beam of 2 keV neutrons having a full width at half maximum of 800 eV has been produced by placing a scandium filter in the Materials Testing Reactor.
28 citations
01 Aug 1969
TL;DR: In this paper, a broadening of allowed and forbidden, triplet and singlet transitions in neutral He at low electron densities, noting Doppler broadening, is discussed.
Abstract: Electron and ion Stark broadening of allowed and forbidden, triplet and singlet transitions in neutral He at low electron densities, noting Doppler broadening
28 citations
TL;DR: In this article, a recently developed analytic formula for radiation trapping in cylindrical geometry with partial frequency redistribution and with a spectral lineshape dominated by almost any combination of natural (radiative) broadening, resonance collisional broadening and Doppler broadening is generalized to include foreign or buffer gas broadening.
Abstract: A recently developed analytic formula for radiation trapping in cylindrical geometry with partial frequency redistribution and with a spectral lineshape dominated by almost any combination of natural (radiative) broadening, resonance collisional broadening, and Doppler broadening is generalized to include foreign or buffer gas broadening. The effect of foreign gas broadening is incorporated by rescaling the radius and absorbing gas density. In some cases rescaling results in an unphysically small radius. The analytic formula reported here, which is accurate to zero radius, is an improved version of the earlier formula. The accuracy of the improved formula is verified with 198 new simulations, in addition to the original 294 simulations, all using a highly realistic Monte Carlo code.
28 citations
TL;DR: In this article, the authors used positron lifetime and Doppler broadening spectroscopic techniques to study defect annealing in FeCrCoNi high entropy alloy and found that the arc melted alloy forms a FCC solid solution.
28 citations