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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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Journal ArticleDOI
TL;DR: In this paper, the electron shift and broadening of spectral lines in dense plasmas are derived on the basis of a recently given Green's function approach to the dielectric function.
Abstract: Expressions for the electron shift and broadening of spectral lines in dense plasmas are derived on the basis of a recently given Green's function approach to the dielectric function. It is shown that in the case of not too high densities these expressions are equivalent to those following from the semiclassical impact approximation. Estimates are given for the shift and broadening of some argon lines.

28 citations

Journal ArticleDOI
TL;DR: In this article, a general theoretical scheme was proposed to investigate the crossover from electromagnetically induced transparency (EIT) to Autler-Townes splitting (ATS) in open ladder-type atomic and molecular systems with Doppler broadening.
Abstract: We propose a general theoretical scheme to investigate the crossover from electromagnetically induced transparency (EIT) to Autler–Townes splitting (ATS) in open ladder-type atomic and molecular systems with Doppler broadening. We show that when the wavenumber ratio kc/kp≈−1, EIT, ATS, and EIT-ATS crossover exist for both ladder-I and ladder-II systems, where kc (kp) is the wavenumber of control (probe) field. Furthermore, when kc/kp is far from −1, EIT can occur, but ATS is destroyed if the upper state of the ladder-I system is a Rydberg state. In addition, ATS exists but EIT is not possible if the control field used to couple the two lower states of the ladder-II system is a microwave field. The theoretical scheme developed here can be applied to atoms, molecules, and other systems (including Na2 molecules, and Rydberg atoms), and the results obtained may have practical applications in optical information processing and transformation.

28 citations

Journal ArticleDOI
TL;DR: In this article, the velocity dependence of collision broadening cross sections for both self-broadening and Xe broadening of an infrared transition in NH 3 has been studied by measuring laser saturation resonance linewidths for molecules with specified velocities along the laser propagation direction.

28 citations

Journal ArticleDOI
TL;DR: In this article, the positron lifetime, Doppler broadening and optical absorption spectroscopies were used to investigate vacancy-type defects in the four main types of diamond (Ia, Ib, IIa and IIb).

28 citations

Journal ArticleDOI
Casey Deen1
TL;DR: MOOGStokes as discussed by the authors is a suite of three complementary programs, which together can synthesize the disk-averaged emergent spectrum of a star with a magnetic field.
Abstract: In an attempt to widen access to the study of magnetic fields in stellar astronomy, I present MOOGStokes, a version of the MOOG one-dimensional local thermodynamic equilibrium radiative transfer code, overhauled to incorporate a Stokes vector treatment of polarized radiation through a magnetic medium. MOOGStokes is a suite of three complementary programs, which together can synthesize the disk-averaged emergent spectrum of a star with a magnetic field. The first element (a pre-processing script called CounterPoint) calculates for a given magnetic field strength, wavelength shifts, and polarizations for the components of Zeeman-sensitive lines. The second element (a MOOG driver called SynStokes derived from the existing MOOG driver Synth) uses the list of Zeeman-shifted absorption lines together with the existing machinery of MOOG to synthesize the emergent spectrum at numerous locations across the stellar disk, accounting for stellar and magnetic field geometry. The third and final element (a post-processing script called DiskoBall) calculates the disk-averaged spectrum by weighting the individual emergent spectra by limb darkening and projected area, and applying the effects of Doppler broadening. All together, the MOOGStokes package allows users to synthesize emergent spectra of stars with magnetic fields in a familiar computational framework. MOOGStokes produces disk-averaged spectra for all Stokes vectors ( I, Q, U, V ), normalized by the continuum. MOOGStokes agrees well with the predictions of INVERS10 a polarized radiative transfer code with a long history of use in the study of stellar magnetic fields. In the non-magnetic limit, MOOGStokes also agrees with the predictions of the scalar version of MOOG.

28 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202331
202290
2021122
2020134
2019128
2018122