scholarly journals Revisiting axion-electron bremsstrahlung emission rates in astrophysical environments

2021 ◽  
Vol 103 (12) ◽  
Author(s):  
Pierluca Carenza ◽  
Giuseppe Lucente
Keyword(s):  
Emission Rates ◽  
Electron Bremsstrahlung ◽  
Bremsstrahlung Emission

scholarly journals Effect of Coulomb Focusing on the Electron–Atom Bremsstrahlung Cross Section for Tungsten and Iron in Nonthermal Lorentzian Plasmas

2020 ◽  
Vol 10 (14) ◽  
pp. 4832
Author(s):  
Myoung-Jae Lee ◽  
Naoko Ashikawa ◽  
Young-Dae Jung
Keyword(s):  
Cross Section ◽  
Atomic Charge ◽  
Bremsstrahlung Spectrum ◽  
Nonthermal Electron ◽  
Emission Rates ◽  
Focusing Effect ◽  
Nonthermal Electrons ◽  
Electron Atom ◽  
Bremsstrahlung Emission ◽  
Bremsstrahlung Process

The Coulomb focusing effect on the electron–atom bremsstrahlung spectrum is investigated in nonthermal Lorentzian plasmas. The universal expression of the cross section of nonrelativistic electron–atom bremsstrahlung process is obtained by the solution of the Thomas-Fermi equation with the effective atomic charge. The effective Coulomb focusing for the electron–atom bremsstrahlung cross section near the threshold domain is also investigated by adopting the modified Elwert-Sommerfeld factor with the mean effective charge for the bremsstrahlung process. In addition, the bremsstrahlung emission rates are obtained by considering encounters between nonthermal electrons and atoms such as Fe and W atoms. We found that the bremsstrahlung emission rates for nonthermal electron–atoms are lower than those for thermal plasmas. Various nonthermal effects on the bremsstrahlung emission rates in Lorentzian plasmas are also discussed.

Modelling of fast electron Bremsstrahlung emission during LHCD with a 2-D relativistic Fokker-Planck code

1996 ◽  
Author(s):  
Y. Peysson ◽  
R. Arslanbekov ◽  
Y. Baranov ◽  
G. T. Hoang ◽  
X. Litaudon ◽  
...  
Keyword(s):  
Fast Electron ◽  
Electron Bremsstrahlung ◽  
Bremsstrahlung Emission ◽  
Fokker Planck

scholarly journals Electron‐Electron Bremsstrahlung Emission and the Inference of Electron Flux Spectra in Solar Flares

2007 ◽  
Vol 670 (1) ◽  
pp. 857-861 ◽  
Author(s):  
Eduard P. Kontar ◽  
A. Gordon Emslie ◽  
Anna Maria Massone ◽  
Michele Piana ◽  
John C. Brown ◽  
...  
Keyword(s):  
Solar Flares ◽  
Electron Flux ◽  
Electron Bremsstrahlung ◽  
Bremsstrahlung Emission

X-RAY BREMSSTRAHLUNG EMISSION DUE TO PLASMA SUPERTHERMAL ELECTRONS

1987 ◽  
Vol 48 (C9) ◽  
pp. C9-355-C9-358
Author(s):  
M. LAMOUREUX ◽  
R. H. PRATT ◽  
L. JACQUET
Keyword(s):  
Superthermal Electrons ◽  
X Ray ◽  
Bremsstrahlung Emission

A Unified Model for Photophysical and Electro-Optical Properties of Green Fluorescent Proteins

2019 ◽  
Author(s):  
Chi-Yun Lin ◽  
Matthew Romei ◽  
Luke Oltrogge ◽  
Irimpan Mathews ◽  
Steven Boxer
Keyword(s):  
Driving Force ◽  
Fluorescent Protein ◽  
Charge Transfer Band ◽  
Photophysical Properties ◽  
Polymethine Dyes ◽  
Emission Rates ◽  
Unified Framework ◽  
Underlying Factor ◽  
Green Fluorescent ◽  
Protein Environment

Green fluorescent protein (GFPs) have become indispensable imaging and optogenetic tools. Their absorption and emission properties can be optimized for specific applications. Currently, no unified framework exists to comprehensively describe these photophysical properties, namely the absorption maxima, emission maxima, Stokes shifts, vibronic progressions, extinction coefficients, Stark tuning rates, and spontaneous emission rates, especially one that includes the effects of the protein environment. In this work, we study the correlations among these properties from systematically tuned GFP environmental mutants and chromophore variants. Correlation plots reveal monotonic trends, suggesting all these properties are governed by one underlying factor dependent on the chromophore's environment. By treating the anionic GFP chromophore as a mixed-valence compound existing as a superposition of two resonance forms, we argue that this underlying factor is defined as the difference in energy between the two forms, or the driving force, which is tuned by the environment. We then introduce a Marcus-Hush model with the bond length alternation vibrational mode, treating the GFP absorption band as an intervalence charge transfer band. This model explains all the observed strong correlations among photophysical properties; related subtopics are extensively discussed in Supporting Information. Finally, we demonstrate the model's predictive power by utilizing the additivity of the driving force. The model described here elucidates the role of the protein environment in modulating photophysical properties of the chromophore, providing insights and limitations for designing new GFPs with desired phenotypes. We argue this model should also be generally applicable to both biological and non-biological polymethine dyes.<br>

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