S₂

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	9.68e-10	2.30e-09
Mathis	5.59e-10	1.62e-09
4000K	3.15e-07	2.18e-12
10000K	6.36e-09	3.82e-10
20000K	9.68e-10	1.86e-09
Lyman-alpha	0.00e+00	8.52e-09
Solar	3.24e-07	3.41e-10
TW-Hya	1.52e-09	5.22e-09
Cosmic ray UV	1.29e-14	3.01e-13

[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	1.26	1.88	0.70	1.70	[Download]	[Download]
Mathis	1.26	1.88	0.70	1.70	[Download]	[Download]
4000K	1.24	1.85	0.71	1.68	[Download]	[Download]
10000K	1.26	1.88	0.70	1.70	[Download]	[Download]
20000K	1.26	1.89	0.70	1.71	[Download]	[Download]
Lyman-alpha	-	-	-	-
Solar	1.25	1.85	0.71	1.68	[Download]	[Download]
TW-Hya	1.25	1.87	0.70	1.69	[Download]	[Download]

Photoionisation

Radiation	γE2	γexp	k0fit	γfit	Line data	Dust data
ISRF	2.24	3.13	0.50	2.79	[Download]	[Download]
Mathis	2.26	3.15	0.50	2.80	[Download]	[Download]
4000K	1.80	2.60	0.58	2.33	[Download]	[Download]
10000K	2.09	2.95	0.53	2.63	[Download]	[Download]
20000K	2.25	3.14	0.49	2.79	[Download]	[Download]
Lyman-alpha	2.11	2.97	0.58	2.70	[Download]	[Download]
Solar	2.13	3.00	0.56	2.71	[Download]	[Download]
TW-Hya	2.12	2.98	0.57	2.71	[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.]