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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Abstract: Cloud droplets may take a variety of paths to reach some location in a cloud and therefore may encounter varying growth conditions. This paper examines the effect of these variations on broadening of the droplet size distribution in cumuli. Diffusional growth of a collection of droplets is studied in detail using measurements obtained during the Cooperative Convective Precipitation Experiment (CCOPE) from the University of Wyoming's King Air research aircraft. A technique is described by which these measurements may be converted to the frame of reference of a moving droplet. Entrainment processes that are associated with variations in vertical velocity appear to have the effect of intensifying fluctuations in integral radius, which in turn produce variations in the supersaturation encountered by the droplets and thus opportunities for variations in growth. Contributions to spectral broadening arise from turbulent structures in the cloud, producing variations in integral radius as well as in the c...
52 citations
TL;DR: A potential buildup in front of a magnetized cascaded arc hydrogen plasma source is explored via E x B rotation and plate potential measurements and asymmetric spectra are observed.
Abstract: A potential buildup in front of a magnetized cascaded arc hydrogen plasma source is explored via $\stackrel{P\vec}{E}\ifmmode\times\else\texttimes\fi{}\stackrel{P\vec}{B}$ rotation and plate potential measurements. Plasma rotation approaches thermal speeds with maximum velocities of $10\phantom{\rule{0.3em}{0ex}}\mathrm{km}∕\mathrm{s}$. The diagnostic for plasma rotation is optical emission spectroscopy on the Balmer-$\ensuremath{\beta}$ line. Asymmetric spectra are observed. A detailed consideration is given on the interpretation of such spectra with a two distribution model. This consideration includes radial dependence of emission determined by Abel inversion of the lateral intensity profile. Spectrum analysis is performed considering Doppler shift, Doppler broadening, Stark broadening, and Stark splitting.
52 citations
TL;DR: In this article, the stimulated Brillouin scattering (SBS) spectrum in an optical fiber is shown to be inhomogeneous, exhibiting spectral broadening and hole burning under cw monochromatic laser excitation.
Abstract: We report experimental results which show that the stimulated Brillouin scattering (SBS) spectrum in an optical fiber is inhomogeneous, exhibiting spectral broadening and hole burning under cw monochromatic laser excitation. This phenomenon arises from the waveguide interaction of the pump and Stokes signals and is a fundamental property of SBS in waveguiding systems due to their ability to confine a fan of radiation wave vector directions.
52 citations
TL;DR: In this paper, the theory of line broadening given by Lax is found not to apply to shallow impurities in Ge and Si and observed broadening may be instrumental at low temperatures and may be due to lifetime broadening through phonon interaction at nitrogen temperature.
Abstract: The theory of line broadening given by Lax is found not to apply to shallow impurities in Ge and Si. Observed broadening may be instrumental at low temperatures and may be due to lifetime broadening through phonon interaction at nitrogen temperature. Calculations suggest that $p$-type spin resonance in germanium and silicon may be observable.
52 citations
TL;DR: In this paper, the authors proposed a method to solve the problem of energy-efficient computing for the U.S. Dept. of Energy's Office of Advanced Scientific Computing Research (OACR).
52 citations