# 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:

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