Look for your molecule's name in the title and abstract; if it is not in either of these, the paper is probably not useful for you.
Good Keywords (this is the sort of data we want!
Fourier Spectroscopy
High resolution
Spectroscopic
Doppler-limited
Infrared
Ultraviolet
The A1Pi --> X1Sigma system of ..., the a3Delta--> b3Pi etc
Rotational, microwave
Be wary of the paper if it contains any of the following keywords in the title or abstract (note: it might have useful results as well as irrelevant data...)