CH

Cross sections

[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	9.14e-10	2.51e-10
Mathis	6.35e-10	1.93e-10
4000K	1.73e-07	9.93e-15
10000K	2.21e-09	2.30e-11
20000K	9.58e-10	2.22e-10
Lyman-alpha	7.87e-12	0.00e+00
Solar	2.13e-07	4.57e-12
TW-Hya	1.13e-09	5.09e-11
Cosmic ray UV	1.08e-13	1.74e-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	1.36	2.12	0.57	1.84	[Download]	[Download]
Mathis	1.32	2.07	0.57	1.79	[Download]	[Download]
4000K	1.03	1.57	0.73	1.41	[Download]	[Download]
10000K	1.17	1.85	0.62	1.61	[Download]	[Download]
20000K	1.42	2.18	0.58	1.91	[Download]	[Download]
Lyman-alpha	2.11	2.97	0.58	2.70	[Download]	[Download]
Solar	1.03	1.57	0.73	1.42	[Download]	[Download]
TW-Hya	1.21	1.91	0.61	1.66	[Download]	[Download]

Photoionisation

Radiation	γE2	γexp	k0fit	γfit	Line data	Dust data
ISRF	2.66	3.61	0.48	3.25	[Download]	[Download]
Mathis	2.69	3.65	0.47	3.27	[Download]	[Download]
4000K	2.36	3.28	0.55	2.98	[Download]	[Download]
10000K	2.56	3.50	0.50	3.15	[Download]	[Download]
20000K	2.70	3.67	0.47	3.29	[Download]	[Download]
Lyman-alpha	-	-	-	-
Solar	2.88	3.87	0.46	3.48	[Download]	[Download]
TW-Hya	2.74	3.71	0.47	3.33	[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.]