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Fine sructure excitation of OI by impact with H (Abrahamsson et al 2007)



Display rate coefficients as : Display rate coefficients graphically : Data information :
  • O I initial level labelled from 1 to 3
  • O I final level labelled from 1 to 3
  • H initial level labelled from 1 to 1
  • H final level labelled from 1 to 1
  • 16 temperatures between 50 K and 1000 K
  • Units : cm3 s-1

O I

H


O I


Fit of rotational de-excitation rate coefficients of OI / He

Initial rate coefficients are reproduced with an accuracy of 0.2%.
Detailed balance is verified with an accuracy of 0.1% for both initial and
interpolated values.

The equation employed in the fit is:

logR(T) = \sum<sub>k=1</sub><sup>N-1</sup>a_k [\frac{logT}{\epsilon}]<sup>k-1</sup> + a_N (\frac{1}{\frac{T}{\epsilon}+1}-1)


Display fit coefficients as : Display fitted coefficients graphically : Data information :
  • O I initial level labelled from 1 to 3
  • O I final level labelled from 1 to 3
  • H initial level labelled from 1 to 1
  • H final level labelled from 1 to 1

N/A

References :

None

The 4 PES are those calculated by Parlant and Yarkony (1999).
A spline interpolation joined with long-range analytical form of the PES is used.

References :


The close coupling method is used (Arthurs & Dalgarno, 1960), (Launay 1977). Total angular momenta is taken from J=0 to 100.

References :


A grid of 1450 kinetic energies from 1 cm-1 to 10000 cm-1

The basis set ignores the electronically excited state of Oxygen ($\\null^1 D$). Nevertheless tests including the coupling to the ($\\null^1 D$) state have been performed; they show that the coupling is insignificant even at high collision energies of 10000 cm-1.

Better precision that (Launay & al, 1977) results.

Presentation

De-excitation rate coefficients of the fine structure of O I (ground state) by H are provided by Abrahamsson et al 2007, in the temperature range 50K to 1000K.

Better precision that (Launay & al, 1977) results.


References

NB : the main reference is displayed in red
PDF Version

Collision history


Status Version Date
Published 1 2006-12-03