Welcome to HITRAN
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.

The current edition of HITRAN is now available to users on an interactive internet application called HITRANonline. HITRANonline and the HITRAN Application Programming Interface, HAPI, provide the user with many new features. The features include the convenient ability to filter, plot, download data in user-defined outputs, calculate absorption and transmission, apply advanced line-shape functions, and many new capabilities.

Harvard University Observatory, circa 1850 The HITRAN compilation, and its analogous database HITEMP (high-temperature spectroscopic absorption parameters), are developed at the Atomic and Molecular Physics Division, Harvard-Smithsonian Center for Astrophysics under the direction of Dr. Iouli E. Gordon.
Last updated: June 2, 2015