NH3

Notes

[For special information on NH3 photodissociation branching ratios 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 1.44e-09 2.69e-10
Mathis 9.87e-10 1.97e-10
4000K 3.63e-09 1.75e-14
10000K 1.71e-09 2.79e-11
20000K 1.43e-09 2.23e-10
Lyman-alpha 1.32e-09 4.75e-11
Solar 4.08e-09 9.57e-12
TW-Hya 1.40e-09 9.01e-11
Cosmic ray UV 1.08e-13 2.17e-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 1.80 2.61 0.53 2.30 [Download] [Download]
Mathis 1.80 2.62 0.53 2.30 [Download] [Download]
4000K 1.66 2.40 0.63 2.17 [Download] [Download]
10000K 1.63 2.37 0.62 2.13 [Download] [Download]
20000K 1.75 2.54 0.55 2.24 [Download] [Download]
Lyman-alpha 2.11 2.97 0.58 2.70 [Download] [Download]
Solar 1.67 2.42 0.63 2.19 [Download] [Download]
TW-Hya 1.87 2.69 0.55 2.39 [Download] [Download]

Photoionisation

Radiation γE2 γexp k0fit γfit Line data Dust data
ISRF 2.54 3.49 0.50 3.14 [Download] [Download]
Mathis 2.56 3.51 0.50 3.16 [Download] [Download]
4000K 2.31 3.21 0.56 2.91 [Download] [Download]
10000K 2.47 3.40 0.52 3.07 [Download] [Download]
20000K 2.58 3.52 0.49 3.17 [Download] [Download]
Lyman-alpha 2.11 2.97 0.58 2.70 [Download] [Download]
Solar 2.65 3.59 0.40 3.13 [Download] [Download]
TW-Hya 2.46 3.38 0.45 2.99 [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.]