H2O

Notes

[For special information on H2O photodissociation branching ratios click here.]
[For special information on water ice photodesorption click here]

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 7.72e-10 2.71e-11
Mathis 5.31e-10 2.65e-11
4000K 1.57e-10 4.26e-17
10000K 4.61e-10 1.71e-12
20000K 7.14e-10 3.14e-11
Lyman-alpha 2.41e-09 0.00e+00
Solar 2.30e-10 4.25e-12
TW-Hya 1.64e-09 2.18e-11
Cosmic ray UV 1.02e-13 2.32e-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 1.80 2.63 0.50 2.28 [Download] [Download]
Mathis 1.82 2.65 0.49 2.30 [Download] [Download]
4000K 1.51 2.22 0.64 2.00 [Download] [Download]
10000K 1.58 2.32 0.60 2.07 [Download] [Download]
20000K 1.76 2.57 0.51 2.23 [Download] [Download]
Lyman-alpha 2.11 2.97 0.58 2.70 [Download] [Download]
Solar 1.64 2.40 0.57 2.12 [Download] [Download]
TW-Hya 1.98 2.82 0.54 2.52 [Download] [Download]

Photoionisation

Radiation γE2 γexp k0fit γfit Line data Dust data
ISRF 3.18 4.27 0.51 3.94 [Download] [Download]
Mathis 3.19 4.28 0.51 3.94 [Download] [Download]
4000K 3.16 4.25 0.51 3.92 [Download] [Download]
10000K 3.18 4.26 0.51 3.93 [Download] [Download]
20000K 3.18 4.27 0.51 3.94 [Download] [Download]
Lyman-alpha - - - -
Solar 3.34 4.46 0.49 4.10 [Download] [Download]
TW-Hya 3.34 4.44 0.48 4.08 [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.]