H₂CO

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	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.]