Opened 4 years ago

#265 new enhancement

updated H electron collisions

Reported by: Gary J. Ferland Owned by: nobody
Priority: good to do Milestone:
Component: atomic/molecular data base Version: trunk
Keywords: Cc:

Description

Comprehensive rate coefficients for electron collision induced transitions in hydrogen

Daniel Vrinceanu, Roberto Onofrio, Hossein R. Sadeghpour
(Submitted on 18 Oct 2013)

Energy-changing electron-hydrogen atom collisions are crucial to regulating the 
energy balance in astrophysical and laboratory plasmas and relevant to the 
formation of stellar atmospheres, recombination in H-II clouds, primordial 
recombination, three-body recombination and heating in ultracold and fusion 
plasmas. Computational modeling of electron-hydrogen collision has been 
attempted through quantum mechanical scattering state-to-state calculations of 
transitions involving low-lying energy levels in hydrogen (with principal quantum
 number n < 7) and at large principal quantum numbers using classical trajectory
 techniques. Analytical expressions are proposed which interpolates the current 
quantum mechanical and classical trajectory results for electron-hydrogen 
scattering in the entire range of energy levels, for nearly all temperature range of
 interest in astrophysical environments. An asymptotic expression for the Born 
cross-section is interpolated with a modified expression derived previously for 
electron-hydrogen scattering in the Rydberg regime using classical trajectory Monte
 Carlo simulations. The derived formula is compared to existing numerical data for
 transitions involving low principal quantum numbers, and the dependence of the
 deviations upon temperature is discussed.

Comments:	To appear in The Astrophysical Journal

Subjects:	Instrumentation and Methods for Astrophysics (astro-ph.IM); Solar and 
Stellar Astrophysics (astro-ph.SR); Plasma Physics (physics.plasm-ph)

Cite as:	arXiv:1310.5164 [astro-ph.IM]
 	(or arXiv:1310.5164v1 [astro-ph.IM] for this version)

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