3He hyperfine collision rate update (trac #287)

reported by: @CloudyLex

Title:  
Hyperfine-changing Transitions in 3He II and Other One-electron Ions by Electron Scattering
Authors:    
Bartschat, Klaus; Sadeghpour, H. R.
Affiliation:    
AA(Department of Physics and Astronomy, Drake University, Des Moines, IA 50311, USA klaus.bartschat@drake.edu), AB(ITAMP, Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138, USA hrs@cfa.harvard.edu)
Publication:    
The Astrophysical Journal, Volume 788, Issue 1, article id. 69, 4 pp. (2014). (ApJ Homepage)
Publication Date:   
06/2014
Origin: 
IOP
Astronomy Keywords: 
atomic data, atomic processes, dark ages, reionization, first stars, early universe, radio lines: general
DOI:    
10.1088/0004-637X/788/1/69
Bibliographic Code: 
2014ApJ...788...69B
Abstract

We consider the spin-exchange (SE) cross-section in electron scattering from 3He II, 
which drives the hyperfine-changing 3.46 cm (8.665 GHz) line transition. Both 
the analytical quantum defect method—applicable at very low energies—and 
accurate R-matrix techniques for electron-He+ scattering are employed to obtain 
SE cross-sections. The quantum defect theory is also applied to electron collisions 
with other one-electron ions in order to demonstrate the utility of the method and 
derive scaling relations. At very low energies, the hyperfine-changing cross-
sections due to e-He+ scattering are much larger in magnitude than for electron 
collisions with neutral hydrogen, hinting at large rate constants for equilibration. 
Specifically, we obtain rate coefficients of K(10 K) = 1.10 × 10–6 cm3 s–1 and 
K(100 K) = 3.49 × 10–7 cm3 s–1.

Migrated from https://www.nublado.org/ticket/287

{
    "status": "new",
    "changetime": "2019-02-04T13:07:06Z",
    "_ts": "1549285626580696",
    "description": "{{{\nTitle:\t\nHyperfine-changing Transitions in 3He II and Other One-electron Ions by Electron Scattering\nAuthors:\t\nBartschat, Klaus; Sadeghpour, H. R.\nAffiliation:\t\nAA(Department of Physics and Astronomy, Drake University, Des Moines, IA 50311, USA klaus.bartschat@drake.edu), AB(ITAMP, Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138, USA hrs@cfa.harvard.edu)\nPublication:\t\nThe Astrophysical Journal, Volume 788, Issue 1, article id. 69, 4 pp. (2014). (ApJ Homepage)\nPublication Date:\t\n06/2014\nOrigin:\t\nIOP\nAstronomy Keywords:\t\natomic data, atomic processes, dark ages, reionization, first stars, early universe, radio lines: general\nDOI:\t\n10.1088/0004-637X/788/1/69\nBibliographic Code:\t\n2014ApJ...788...69B\nAbstract\n\nWe consider the spin-exchange (SE) cross-section in electron scattering from 3He II, \nwhich drives the hyperfine-changing 3.46 cm (8.665 GHz) line transition. Both \nthe analytical quantum defect method\u2014applicable at very low energies\u2014and \naccurate R-matrix techniques for electron-He+ scattering are employed to obtain \nSE cross-sections. The quantum defect theory is also applied to electron collisions \nwith other one-electron ions in order to demonstrate the utility of the method and \nderive scaling relations. At very low energies, the hyperfine-changing cross-\nsections due to e-He+ scattering are much larger in magnitude than for electron \ncollisions with neutral hydrogen, hinting at large rate constants for equilibration. \nSpecifically, we obtain rate coefficients of K(10 K) = 1.10 \u00d7 10\u20136 cm3 s\u20131 and \nK(100 K) = 3.49 \u00d7 10\u20137 cm3 s\u20131.\n}}}",
    "reporter": "gary",
    "cc": "",
    "resolution": "",
    "time": "2014-05-31T08:51:40Z",
    "component": "atomic/molecular data base",
    "summary": "3He hyperfine collision rate update",
    "priority": "good to do",
    "keywords": "",
    "version": "trunk",
    "milestone": "no milestone",
    "owner": "nobody",
    "type": "enhancement"
}

cloudy-astrophysics / bug-tracker-migration-test

3He hyperfine collision rate update (trac #287) #289