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#355 new enhancement

improved three body recombination rates

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


This paper offers a simple equation 15 to give net 3-body recombination rates. This may be an improvement upon our current "Cota" rates.

Plasma density effects on the three-body recombination rate coefficients
Hahn, Yukap
AA(Department of Physics, University of Connecticut, Storrs, CT 06269, USATRG, 49 Timber Drive, Storrs, CT 06268, USA)
Physics Letters A, Volume 231, Issue 1, p. 82-88.
Publication Date:	
Abstract Copyright:	
(c) 1997 Elsevier Science B.V. All rights reserved.
Bibliographic Code:	

The existing reaction rate coefficients for the three-body recombination of 
ions with plasma electrons have a strong T-4.5 dependence on the electron 
temperature T, which seems to break down at low temperature, for T < 1 K 
?- 10 -4 eV. The obvious deficiency of the formula is the neglect of the 
plasma density effect on the recombined Rydberg states. A simple 
correctional procedure is adopted in terms of a density dependent cutoff of 
these high Rydberg states, which seems to improve the rates at low T. The 
total rate coefficients are now proportional to T-1, for the density N not too 
low. The T dependence is closely related to the density, so that the -4.5 
exponent is still valid at high T and low N region. Some numerical examples 
are given, and possible further improvements are suggested. The high and 
low T formulas interpolate smoothly through the principal quantum number 

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