O2

Notes

Alan Heays (2020-03-11)

There was an error in the previous cross section derived for Heays et al. 2017 with spurious weak absorption for wavelengths longer than the dissociation limit. This has been corrected here and a few other minor improvements made.

Cross sections

Cross section figure.


[An explanation of the cross sections in this database]
[All cross sections — variable wavelength scale]
[All cross sections — variable wavelength scale in binary hdf5 format]
[All cross sections — 0.1nm wavelength scale]
[Photodissociation cross section — separate lines and continuum]
[Photoionisation cross section — separate lines and continuum]
[Download cross section figure as pdf]

Photodissociation and ionisation rates (s-1)

Radiation Photodissociation Photoionisation
ISRF 7.51e-10 4.89e-11
Mathis 4.88e-10 4.29e-11
4000K 7.32e-11 1.26e-16
10000K 5.50e-10 3.23e-12
20000K 7.23e-10 5.34e-11
Lyman-alpha 2.02e-12 0.00e+00
Solar 6.10e-11 3.49e-12
TW-Hya 3.44e-10 2.25e-11
Cosmic ray UV 7.56e-14 3.08e-15

[An explanation of the interstellar photo rates.]
[An explanation of the cosmic-ray induced photo rates.]
[An explanation of the radiation fields listed below.]
[Download all rates in a csv file.]

Shielding functions and fitted constants

Photodissociation

Radiation γE2 γexp k0fit γfit Line data Dust data
ISRF 1.69 2.45 0.59 2.19 [Download] [Download]
Mathis 1.69 2.46 0.58 2.19 [Download] [Download]
4000K 1.56 2.28 0.63 2.05 [Download] [Download]
10000K 1.63 2.37 0.61 2.13 [Download] [Download]
20000K 1.68 2.44 0.59 2.17 [Download] [Download]
Lyman-alpha 2.11 2.97 0.58 2.70 [Download] [Download]
Solar 1.57 2.31 0.61 2.06 [Download] [Download]
TW-Hya 1.64 2.40 0.60 2.14 [Download] [Download]

Photoionisation

Radiation γE2 γexp k0fit γfit Line data Dust data
ISRF 3.14 4.22 0.51 3.89 [Download] [Download]
Mathis 3.15 4.23 0.51 3.90 [Download] [Download]
4000K 3.09 4.16 0.52 3.83 [Download] [Download]
10000K 3.14 4.21 0.51 3.88 [Download] [Download]
20000K 3.15 4.23 0.51 3.90 [Download] [Download]
Lyman-alpha - - - -
Solar 3.33 4.43 0.49 4.07 [Download] [Download]
TW-Hya 3.31 4.41 0.48 4.04 [Download] [Download]

[An explanation of the shielding functions and parameterisations.]
[Download all γ factors in a csv file.]
[Download all dust and line shielding functions in a zip file.]