The current edition of HITEMP is described in the article "HITEMP, the high-temperature molecular spectroscopic database" (2010)[1]. This replaces the earlier edition [2], "HITRAN, HAWKS and HITEMP High-Temperature Molecular Database" (1995).

This edition of the HITEMP database has been placed on the FTP server.
Login with the username anonymous and your email address as the password.

To access the HITEMP data directly by from the command line:

ftp to
  user = anonymous
  password = e-mail address
cd  /pub/HITEMP-2010

In the directory /pub/HITEMP-2010 you will find five folders:

Folder Number of
Total number
of transitions
Spectral Coverage
H2O_line_list 6 114,241,164 0 - 30000
CO2_line_list 7 11,193,608 258 - 9648
CO_line_list 6 113,631 3 - 8465
NO_line_list 3 115,610 0 - 9274
OH_line_list 3 41,557 0 - 19268

Due to the very large files for water and carbon dioxide, the line-parameter files within the H2O and CO2 folders have been broken up into wavenumber intervals and are also in compressed format (see readme file in top directory for a description).

The format of the line transitions in HITEMP is currently the same as the former fixed-length HITRAN databases (160 characters per transition). Please cite the HITEMP article as well as the original sources of data when using this database. We hope that you will find HITEMP helpful in your research.


[1] L. S. Rothman, I. E. Gordon, R. J. Barber, H. Dothe, R. R. Gamache, A. Goldman, V. Perevalov, S. A. Tashkun, J. Tennyson, "HITEMP, the high-temperature molecular spectroscopic database", J. Quant. Spectrosc. Radiat. Transfer 111, 2139-2150 (2010).

[2] L. S. Rothman, R. B. Wattson, R. R. Gamache, J. Schroeder, and A. McCann, "HITRAN, HAWKS and HITEMP High-Temperature Molecular Database", Proc. Soc. Photo Optical Instrumentation Engineers 2471, 105-111 (1995).