HITRANonline

Details regarding the structure of the Collision Induced Absorption (CIA) data available through HITRANonline are given in Ref. [1]. Further descriptions of the content and format of the CIA files are described in the following readme document, with corresponding reference sources given in the reference document:

•   CIA_Readme_2024.pdf
  
•   CIA_References_2024.pdf

The following CIA data are available to download by clicking the appropriate download icon (), and selecting "Save File".
 

System	νmin (cm-1)	νmax (cm-1)	Filename	# of sets	Download
CH4–He	1	1 000	CH4-He_2018.cia	10
CO2–Ar	0	300	CO2-Ar_2021.cia	21
CO2–CH4	0	720	CO2-CH4_2024.cia	6
CO2–CO2	1	4 500	CO2-CO2_2024.cia	37
CO2–H2	5	1 500	CO2-H2_2024.cia	6
CO2–H2O	5 700	6 300	CO2-H2O_2024.cia	1
CO2–He	0	1 000	CO2-He_2018.cia	1
H2–CH4 (equilibrium)	0	1 946	H2-CH4_eq_2011.cia	10
H2–CH4 (normal)	0	1 946	H2-CH4_norm_2011.cia	10
H2–H	100	10 000	H2-H_2011.cia	4
H2–H2	20	10 000	H2-H2_2011.cia	113
H2–He	20	20 000	H2-He_2011.cia	334
He–H	50	11 000	He-H_2011.cia	10
N2–air	1 850	5 000	N2-air_2018.cia	24
N2–Ar	0	2 600	N2-Ar_2024.cia	45
N2–CH4	0	800	N2-CH4_2024	34
N2–H2	0	5 100	N2-H2_2024.cia	11
N2–H2O	1 930	2 830	N2-H2O_2018.cia	11
N2–He	1	1 000	N2-He_2018.cia	1
N2–N2	0	5 000	N2-N2_2021.cia	58
O2–air	1 300	13 839	O2-air_2024.cia	25
O2–CO2	9 105	13 839	O2-CO2_2024.cia	2
O2–N2	1 300	13 840	O2-N2_2024.cia	33
O2–O2	1 150	33 670	O2-O2_2024.cia	46
Note: The upper and lower wavenumber limits refer to the complete region covered by the CIA file

Supplementary files in Alternate folder

Further supplementary files are also available for download by clicking the links below. Before using these supplementary files, we refer users to Ref. [1] and the readme files above for a thorough description.

CH4-Ar_2011.cia   CH4-CH4_2011.cia   CO2-CH4_2024.cia   CO2-CO2_2011.cia   CO2-H2_2018.cia   H2-He_exp_2024.cia   H2-He_eq_2011.cia   H2-He_norm_2011.cia   N2-Ar_2024.cia   N2-CH4_2011.cia   N2-N2_lowT_2018.cia   O2-Air_altern_2016.cia   O2-Air_theory_temp_2018.cia   O2-N2_theory_temp_2018.cia   O2-O2_exp_2021.cia   O2-O2_theory_temp_2018.cia

H2-H2_exp_2024.cia   H2-H2_eq_2018.cia   H2-H2_norm_2018.cia   H2-H2_fp1_2018.cia   H2-H2_fp0.62_2018.cia   H2-H2_fp0.54_2018.cia   H2-H2_fp0.47_2018.cia   H2-H2_fp0.41_2018.cia   H2-H2_fp0.35_2018.cia   H2-H2_fp0.9_2018.cia   H2-H2_fp0.8_2018.cia   H2-H2_fp0.7_2018.cia   H2-H2_fp0.3_2018.cia

References

[1] J. Terragni, I. E. Gordon, A. M. Adkins, C. Boulet, A. Campargue, D. Chistikov, et al., "Collision induced absorption in HITRAN2024: Enhanced and improved data for atmospheric and planetary studies", J. Quant. Spectrosc. Radiat. Transfer in press, 109631 (2025). [link to article].