No. The HITRAN database and its associated compilations are free.
The transitions (line positions) in the HITRAN database are given as vacuum wavenumbers (cm-1). The intervals for the IR and UV cross-sections are likewise given in vacuum wavenumbers.
The units for intensity in HITRAN are cm-1/( molec × cm-2 ) at the standard HITRAN temperature of 296 K. This unit has been chosen for its convenience for input to transmission and radiance modeling computer codes. An illustration of the definition of intensity, line position, and half-width is given in Fig. 1 of the Appendix to the article on the 1996 Edition of HITRAN: Rothman et al., Journal of Quantitative Spectroscopy and Radiative Transfer 60, 665-710 (1998).
HITRAN is a database, not a “simulation” code. It provides a suite of parameters that are used as input to various modeling codes, either very high-resolution line-by-line codes, or moderate spectral resolution band-model codes. These radiative-transfer codes are based on the Beer-Lambert law of attenuation and may include many more features of modeling, for example scattering, continuum absorption, atmospheric constituent profiles, etc.
The parameters in HITRAN are a mixture of direct observations, theoretical calculations, and semi-empirical values. The calculations are the result of various quantum-mechanical solutions. The goal of HITRAN is to have a theoretically self-consistent set of parameters, while at the same time attempting to maximize the accuracy. References for the source are included for the most important parameters on each line of the database.
In this case for any user-defined custom output format (excluding the traditional .par output), the field space (length) dedicated to this parameter will be filled with "#" signs. Note that in the traditional .par output file there are only two cases where parameters may not have a value: (1) for unassigned lines there are sometimes missing lower-state energies which are substituted with the flag "-1" (2) for missing sets of quantum numbers, which are replaced by blank spaces.
Users should take all of these situations into account when creating programs designed to work with the database.
HITRAN-PC is a commercial software product for laser remote sensing of the atmosphere that uses the HITRAN, EPA, or PNNL databases to calculate high-resolution molecular absorption and aerosol attenuation for horizontal or slant paths, different atmospheric models, and gas plume geometries. It was developed for easy use on a PC by Professor Dennis Killinger and Drs. William Wilcox and Denis Pliutau at the University of South Florida (Killinge@usf.edu; ref. D. K. Killinger, "HITRAN-PC: 25 Years of Academic Development…," J. of Technology and Innovation 14, 303-327 (2012) and is distributed by the Ontar Corporation (http://www.ontar.com).
While we strongly encourage users to select only the data that they actually need, the server will still create files for the entire dataset if requested. It will just take a long time to build. The user can retrieve these files from their individual "Search History" which can be accessed by clicking on the "Clock" icon in the upper right corner.