HITRAN is an acronym for high-resolution transmission molecular absorption database. HITRAN is a compilation of spectroscopic parameters that a variety of computer codes use to predict and simulate the transmission and emission of light in the atmosphere.


11000 users milestone

There are now over 11000 users registered on www.hitran.org

The data on this website corresponds to the HITRAN2016 edition 🎺

Dear Colleagues,

The data on this website corresponds to the recently released HITRAN2016 edition of the database. The HITRAN2016 paper describing the new edition is available in Open Access

I.E. Gordon, L.S. Rothman, C. Hill, R.V. Kochanov, Y. Tan, P.F. Bernath, M. Birk, V. Boudon, A. Campargue, K.V. Chance, B.J. Drouin, J.-M. Flaud, R.R. Gamache, J.T. Hodges, D. Jacquemart, V.I. Perevalov, A. Perrin, K.P. Shine, M.-A.H. Smith, J. Tennyson, G.C. Toon, H. Tran, V.G. Tyuterev, A. Barbe, A.G. Császár, V.M. Devi, T. Furtenbacher, J.J. Harrison, J.-M. Hartmann, A. Jolly, T.J. Johnson, T. Karman, I. Kleiner, A.A. Kyuberis, J. Loos, O.M. Lyulin, S.T. Massie, S.N. Mikhailenko, N. Moazzen-Ahmadi, H.S.P. Müller, O.V. Naumenko, A.V. Nikitin, O.L. Polyansky, M. Rey, M. Rotger, S.W. Sharpe, K. Sung, E. Starikova, S.A. Tashkun, J. Vander Auwera, G. Wagner, J. Wilzewski, P. Wcisło, S. Yu, E.J. Zak, The HITRAN2016 Molecular Spectroscopic Database, J. Quant. Spectrosc. Radiat. Transf. (2017) 203, 3-69.

==> Note that we are still making ongoing improvements to many molecular bands. Updates, improvements, and corrections to the edition are posted in the "Database Updates" panel located on the home page of the HITRAN web-site. When citing the database it is recommended to indicate if an updated version of the HITRAN2016 edition was used.

Please e-mail to us (info@hitran.org) a summary of any serious problems you encounter (or successes or suggestions).

Articles describing HITRANonline, HAPI, and new line-shape representations

All inquiries can be made to HITRAN's support team at info@hitran.org

The HITRAN support e-mail has been established and our team is ready for questions.

Database Updates

Update to the line-mixing package for CO2

The line-mixing package for CO2 had been updated, to make input line-widths consistent with the actual widths provided to the database, with an exception to when these line-widths were obtained with speed-dependent Voigt profile rather than Voigt. In that case alternative approach was used. In some regions the change results in appreciable differences corresponding to decrease of the residuals when applied to real laboratory data. The line-mixing package is available at http://hitran.org/suppl/LM/

Addition of parameters associated with broadening of spectral lines by water vapor

Parameters associated with broadening of spectral lines by the pressure of ambient water vapor have been added to the database for the first time. In this first installment we added broadening parameter gamma_H2O to all lines of carbon dioxide (CO2).

Correction of the Einstein-A coefficients for COCl2

It was discovered that the Einstein-A coefficients for all transitions of both isotopologue of phosgene were calculated erroneously in HITRAN2016. These parameters have been corrected in this update.

Updates to the H2O linelist

It was discovered that about 1500 lines with intensities of the order of 10-28 cm/molecule in the 8340-10240 cm-1 region were accidentally omitted from the database. These lines have been restored from the HITRAN 2012 edition. Also a small number of lines were removed or reassigned, fixing errors associated with different assignments of lines in the linelists that were combined together to form the HITRAN2016 edition.

Note that a very substantial update is underway to correct a number of errors associated with erroneous calculations of the statistical weights for some of the isotopologues of water vapor, especially D2. The upcoming update however will not largely affect line positions nor intensities for most of the water vapor lines in HITRAN.

Update of the CO2-broadening parameters of CO lines

The broadening parameters of CO lines due to the pressure of CO2, and especially their temperature dependencies, were updated using data from Hashemi et al, J of Molec Spectrosc (2016) 326, 60-72.

Minor corrections to the CO2 line list

It was found that due to a programming error 19 lines (with P1e assignment) of some bands of asymmetric isotopologues of carbon dioxide had air-broadened half-width values of zero in the official release of HITRAN2016. This has been fixed now and all of these lines have appropriate values for this parameter.

In addition the pure rotational transitions of the 16O12C17O isotopologue were missing upper-state quantum numbers associated with the hyperfine splitting. This in turn caused erroneous calculation of the upper-state statistical weight and the Einstein-A coefficients. All of these weak lines have been fixed now.

Once again we would like to remind users that the 11th and 12th isotopologues of carbon dioxide are labeled as A and B respectively if one asks for the output in the ".par" format. This should be taken into account in radiative transfer codes.