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VPL Molecular Spectra Search Engine

This Virtual Planetary Laboratory tool is a search engine that queries the molecular spectroscopic database HITRAN 2008 and displays plots of line intensity versus wavelength for all molecules active within a user specified wavelength range. If there are no lines for the given wavelength range then the search engine returns a 0. For further details please see the documentation. For other related search engines please see the VPL Molecular Spectra Search Engine.

Choose a wavelength range:

wavelength range in micro-meter units (between 0.1 µ m and 100 µ m)
wavelength_low: µ m
wavelength_high: µ m


Please press the findplots button only once.
It can take a few minutes to make the plots.

The plots are for the most abundant isotopologue.