Über die Verbreiterung von Spektrallinien

Holtsmark, J.

doi:10.1002/andp.19193630702

Cited by 524 publications

(252 citation statements)

References 5 publications

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“…Here we present a statistical technique for deriving the spectrum of random fluctuations of the combined force and tidal fields generated by statistical ensembles of extended substructures with known mass and size functions. Our work follows up the method originally devised by Holtsmark (1919) to study the motion of charged particles in an ionized plasma.…”

Section: Discussionmentioning

confidence: 99%

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Fluctuations of the gravitational field generated by a random population of extended substructures

Peñarrubia

2017

Monthly Notices of the Royal Astronomical Society

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A large population of extended substructures generates a stochastic gravitational field that is fully specified by the function p(F), which defines the probability that a tracer particle experiences a force F within the interval F, F + dF. This paper presents a statistical technique for deriving the spectrum of random fluctuations directly from the number density of substructures with known mass and size functions. Application to the subhalo population found in cold dark matter simulations of Milky Way-sized haloes shows that, while the combined force distribution is governed by the most massive satellites, the fluctuations of the tidal field are completely dominated by the smallest and most abundant subhaloes. In light of this result we discuss observational experiments that may be sufficiently sensitive to Galactic tidal fluctuations to probe the "dark" low-end of the subhalo mass function and constrain the particle mass of warm and ultra-light axion dark matter models.

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Section: Discussionmentioning

confidence: 99%

“…To attack this problem we shall follow a statistical method originally introduced by Holtsmark (1919) to describe the motion of charged particles in a plasma.…”

Section: Stochastic Fluctuations Of the Fieldmentioning

confidence: 99%

Fluctuations of the gravitational field generated by a random population of extended substructures

Peñarrubia

2017

Monthly Notices of the Royal Astronomical Society

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“…This is very nearly equal to the field produced by an ion of charge p which is at a mean ion-ion distance r~ = (1~i iN~I3 Y~' 3 from the perturbed ion , Since in a neutral plasma containing , e.g., only a single ion species , the electron density ie related to the ion density by N = the electronic Holtsmark field F 0 -2.603eN~'~~ (2) 0 is related to that produced by ions by p ~~' 3 F~.…”

Section: IXmentioning

confidence: 95%

Stark-profile calculations for Lyman-series lines of one-electron ions in dense plasmas

1979

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“…Electron broadening in the impact approximation results in a pure Lorentzian wing decay, assuming random collisions, whereas a somewhat faster decay is typically observed due to the influence of the ion microfields (see [17] or [18] for details). For the Holtsmark microfield distribution function [19] the wing decay is ∝ ∆λ −5/2 . To obtain the FWHM for transitions with a shift in the central component (e.g., Ba-β (n=4→2), Pa-β (n=5→3)) the line fitting model consists of one central and two shifted modified Lorentzian components in order to resolve the central dip, as shown in Figure 1 (left).…”

Section: Line Profile Modelmentioning

confidence: 99%

Inferring divertor plasma properties from hydrogen Balmer and Paschen series spectroscopy in JET-ILW

et al. 2015

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The full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-pro t purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. Abstract.A parametrised spectral line profile model is formulated to investigate the diagnostic scope for recovering plasma parameters from hydrogenic Balmer and Paschen series spectroscopy in the context of JET-ILW divertor plasmas. The separate treatment of Zeeman and Stark contributions in the line model is tested against the PPP-B code which accounts for their combined influence on the spectral line shape. The proposed simplified model does not fully reproduce the Stark-Zeeman features for the α and β transitions, but good agreement is observed in the line width and wing profiles, especially for n >5. The line model has been applied to infer radial density profiles in the JET-ILW divertor with generally good agreement between the D 5→2, 5→3, 6→2, 7→2 and 9→2 lines for high recycling and detached conditions. In an L-mode detached plasma pulse the Langmuir probe measurements typically underestimated the density by a factor 2-3 and overestimated the electron temperature by a factor of 5-10 compared to spectroscopically derived values. The line model is further used to generate synthetic high-resolution spectra for low-n transitions to assess the potential for parameter recovery using a multi-parametric fitting technique. In cases with 4 parameter fits with a single Maxwellian neutral temperature component the D 4→3 line yields the best results with parameter estimates within 10% of the input values. For cases with 9 parameter fits inclusive of a multi-component neutral velocity distribution function the quality of the fits is degraded. Simultaneous fitting of the D 3→2 and 4→3 profiles improves the fit quality significantly, highlighting the importance of complementary spectroscopic measurements for divertor plasma emission studies.

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Über die Verbreiterung von Spektrallinien

Cited by 524 publications

References 5 publications

Fluctuations of the gravitational field generated by a random population of extended substructures

Fluctuations of the gravitational field generated by a random population of extended substructures

Stark-profile calculations for Lyman-series lines of one-electron ions in dense plasmas

Inferring divertor plasma properties from hydrogen Balmer and Paschen series spectroscopy in JET-ILW

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