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.
Three articles that are very helpful in assisting users in learning how to work with new tools and parameters in the HITRAN database have just been published in JQSRT.
1. Article describing structure and working capabilities of HITRANonline (www.hitran.org)
2. Article describing working capabilities of HITRAN Application Programming Interface (HAPI) (www.hitran.org/hapi)
3. Article describing implementation of the Hartmann-Tran profile in the HITRAN database
This is a video tutorial for using HITRANonline. Users are given an overview of the capabilities of the system, including creating their own output formats, access to the sources of data, and the parameters that are new with respect to the traditional 160-character .par files. The link for the tutorial is
The HITRAN support e-mail has now been established and our team is ready for questions!
The air-induced line shape parameters within the Hartmann-Tran profile formalism were added to the lines in the ν3 band of the principal isotopologue of N2O. These data are based on the recent measurements by Loos et al, JQSRT 151 (2015) 300–309. Also the shifts of the corresponding lines within the traditional Voigt formalism were updated.
The lines of the principal isotopologue of HCN from 3500 to 17586 cm-1 were added to HITRAN for the first time. These data are based on the linelist of Barber et al MNRAS 437 (2014) 1828-1835 which is a mixture of the ab initio intensities and line positions from Harris et al, MNRAS 367 (2006) 400-406, supplemented with empirically-derived line positions wherever possible
Recent experimental measurements and calculations were used to update the self- and air- broadening coefficients (with their temperature dependencies) of all CH3Cl lines. In addition, the 1900-2600 cm-1 spectral region was completely revised, with line positions and intensities calculated based on the recently analyzed Fourier transform spectra in the range of 1900-2600 cm-1 (Nikitin et al, JQSRT (2016) 177, 49–58).
The details of the entire update are given in this linked report
The IUPAC-recommended Hartmann-Tran profile (Tran et al, J. Quant. Spectrosc. Radiat. Transfer 129, 199-203 (2013); J. Quant. Spectrosc. Radiat. Transfer 134, 104 (2014)) is now implemented in the database. At this time it is implemented for self-broadening and shifting in four temperature regimes. Overall, 27 new parameters are added. The hydrogen molecule was chosen as a test case and every line of H2 now has these parameters. The description of how these parameters were derived and details of parametrization are given in the article Wcislo et al. “The implementation of non-Voigt line profiles in the HITRAN database: H2 case study” that is JQSRT, 177, 75-91 (2016).
Note that no such parameters have been added to the HD isotopologue yet. Also we removed 527 transitions of H2 that correspond to high vibrational overtones. This was because there were numerical issues in calculating the intensities of these transitions. Medvedev et al, J. Chem. Phys. 143, 154301 (2015) explain how the use of double precision in calculating overtone intensities may lead to numerical errors and that quadruple precision is needed.
The air-broadening coefficients of HO2 have been updated using an algorithm described in the report by Tan et al, "The air-broadening coefficients of HO2". This algorithm was derived based on recent experimental measurements. For the self-broadening, a default estimate value of 0.3 cm-1/atm was assigned to all transitions.
For H2O2, the measurements of the air-broadening halfwidths from Malathy Devi et al, Appl.Opt. 25, 1844-1847 (1986); Goyette et al, JQSRT 40, 129–134 (1988); and Sato et al, JQSRT 111, 821–825 (2010) were included for the corresponding transitions. The majority of the air-broadened coefficients in the database still have same value of 0.1 cm-1/atm estimated from the measurements of Malathy Devi et al.
Broadening and shift parameters due to the foreign broadeners H2, He, and CO2 have been added to HITRAN for the first time. Currently, the corresponding half-widths, their temperature dependences and pressure-induced shifts by these perturbers for every HITRAN line of SO2, NH3, HF, HCl, OCS and C2H2 can be retrieved from HITRANonline. For HCl-H2 one can also obtain the temperature dependence of the shift. The data are described in the article Wilzewski et al. “H2, He, and CO2 line-broadening coefficients, pressure shifts and temperature-dependence exponents for the HITRAN database. Part 1: SO2, NH3, HF, HCl, OCS and C2H2” that was just published in JQSRT. JQSRT 168, 193–206 (2016).
The values of line positions and lower-state energies for the O atom have been reverted to those given in the HITRAN1996-2000 editions. They originate from L.R. Zink, K.M. Evenson, F. Matsushima, T. Nelis, R.L. Robinson, "Atomic oxygen fine-structure splittings with tunable far-infrared spectroscopy", Astrophysical Journal, Part 2 - Letters 371, L85-L86 (1991). The HITRAN2004-2012 editions used now outdated values from the JPL catalogue, although the reference code still erroneously pointed to the work of Zink et al. The older JPL values have since been fixed in the JPL catalogue, and consequently we reverted back to the more accurate values of Zink et al.
Similar to the error found for the HD molecule mentioned previously, the abundance of the 14N15N isotopologue was incorrectly calculated in the original release of HITRAN2012; this issue has now been fixed in the latest data available from this website.
It was discovered by J. Mendrok (Lulea University of Technology, Kiruna, Sweden) that the abundance of the HD molecule was incorrectly calculated in the original release of HITRAN2012; this issue has now been fixed. The implication was that the intensities of the electric dipole transitions originally reported needed to be multiplied by two, although it did not affect the Einstein-A coefficients.
In addition, a total number of 7195 electric quadrupole transitions of the HD molecule have been calculated and added to the HITRAN line list. The calculation was carried out using the energy levels from the work by K. Pachucki and J. Komasa, “Rovibrational levels of HD”, Phys. Chem. Chem. Phys. 12, 9188-9196 (2010) and the quadrupole moment function of L. Wolniewicz, I. Simbotin, and A. Dalgarno, “Quadrupole Transition Probabilities for the Excited Rovibrational States of H2”, Astrophys. J. Suppl. Ser. 115, 293-313 (1998).
For the purpose of validation, comparisons between the HITRAN database, Kurucz database, and the most recent experimental results have been performed for the H2 and HD transitions. The corresponding report, Comparison of Hydrogen Databases, provides more details on this effort.