H2CO

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 1.42e-09 3.96e-10
Mathis 9.55e-10 3.07e-10
4000K 3.98e-09 1.10e-14
10000K 9.58e-10 3.49e-11
20000K 1.33e-09 3.58e-10
Lyman-alpha 1.49e-09 0.00e+00
Solar 5.10e-09 1.31e-11
TW-Hya 1.41e-09 1.05e-10
Cosmic ray UV 1.32e-13 2.93e-14

[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 1.74 2.54 0.55 2.24 [Download] [Download]
Mathis 1.75 2.55 0.54 2.25 [Download] [Download]
4000K 1.04 1.60 0.72 1.44 [Download] [Download]
10000K 1.55 2.30 0.60 2.04 [Download] [Download]
20000K 1.72 2.51 0.55 2.21 [Download] [Download]
Lyman-alpha 2.11 2.97 0.58 2.70 [Download] [Download]
Solar 1.04 1.60 0.72 1.44 [Download] [Download]
TW-Hya 1.84 2.67 0.53 2.35 [Download] [Download]

Photoionisation

Radiation γE2 γexp k0fit γfit Line data Dust data
ISRF 2.69 3.66 0.49 3.30 [Download] [Download]
Mathis 2.73 3.70 0.48 3.33 [Download] [Download]
4000K 2.43 3.36 0.55 3.06 [Download] [Download]
10000K 2.62 3.57 0.50 3.23 [Download] [Download]
20000K 2.75 3.72 0.48 3.35 [Download] [Download]
Lyman-alpha - - - -
Solar 3.08 4.08 0.44 3.67 [Download] [Download]
TW-Hya 2.88 3.86 0.45 3.46 [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.]