The National Institute of Standards and Technology (NIST) is closed now, as are its web pages, which we used to show our undergraduate students as an easy way of finding some data for diatomic molecules (bond length, frequency etc.). Of course these data can be found in the Herzberg book, but does anybody know some internet alternative to NIST, at least for constants of diatomic molecules, which can be used in a classroom and which is for free?
Fundamental frequencies of several diatomic molecules are given at the HITRAN database: http://www.cfa.harvard.edu/hitran/.
Thank you for these links. They are not exactly what I want, but they are interesting anyway. In the meantime, as you know, the problem with the NIST unavailability has been solved:-)
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