E-Trans is Ontar's
program for calculating transmittance through
as many as five individual homogeneous gas
mixture layers. It incorporates the instrument
response function of Fourier Transform spectrometers
(i.e., various apodization functions and
spectral resolution). The program utilizes
the HITRAN database for the infrared spectra.
E-Trans allows the user to specify the gas
composition, temperature, and pressure.
E-Trans consists of six user-friendly program
units: the user interface, a controlling
program, and four spectral calculation subprograms.
The program examines input parameters for
consistency and completeness, interprets
the parameters, and prepares the input files.
A "true" transmission spectrum
is generated for the atmospheric and trace
gases selected. Output files are converted
in GRAMS format modified into a synthetic
transmittance or absorbance spectrum for
the specified resolution.
By installing the HITRAN database on your
hard drive, the run time will be substantially
reduced. Sample input and output files may
also be installed. E-Trans can read data
in the JCAMP format supplied in the NIST
Quantitative Infrared Database.
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