C₂

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	2.35e-10	3.25e-10
Mathis	1.72e-10	2.82e-10
4000K	4.61e-13	1.27e-15
10000K	4.47e-11	2.19e-11
20000K	2.15e-10	3.38e-10
Lyman-alpha	7.83e-11	0.00e+00
Solar	7.41e-12	8.60e-12
TW-Hya	9.22e-11	8.07e-11
Cosmic ray UV	1.83e-14	2.06e-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	2.15	3.04	0.44	2.63	[Download]	[Download]
Mathis	2.20	3.09	0.43	2.66	[Download]	[Download]
4000K	1.80	2.59	0.60	2.33	[Download]	[Download]
10000K	1.92	2.75	0.53	2.44	[Download]	[Download]
20000K	2.19	3.08	0.42	2.65	[Download]	[Download]
Lyman-alpha	2.11	2.97	0.58	2.70	[Download]	[Download]
Solar	2.05	2.91	0.51	2.57	[Download]	[Download]
TW-Hya	2.12	2.99	0.51	2.65	[Download]	[Download]

Photoionisation

Radiation	γE2	γexp	k0fit	γfit	Line data	Dust data
ISRF	3.06	4.12	0.50	3.77	[Download]	[Download]
Mathis	3.09	4.15	0.50	3.80	[Download]	[Download]
4000K	2.86	3.87	0.50	3.53	[Download]	[Download]
10000K	3.04	4.08	0.50	3.74	[Download]	[Download]
20000K	3.09	4.14	0.50	3.80	[Download]	[Download]
Lyman-alpha	-	-	-	-
Solar	3.09	4.15	0.51	3.81	[Download]	[Download]
TW-Hya	3.08	4.13	0.50	3.79	[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.]