Observation, measurement, and analysis of
high resolution rotational, vibrational, or electronic spectra
of molecules (radicals, ions, complexes, clusters, ...)
in the gas phase or in matrices.
Experimental techniques for observing such spectra.
Theory assisting the prediction, simulation, and interpretation of
Applications in related fields such as the physics and chemistry
of the atmospheres of planets and cool stars, the physics and
chemistry of the interstellar medium, chemical kinetics,
biologically important molecules in the gas phase or in matrices,
combustion, cold molecules, metrology, etc.