Abstract
Eigenstates of the rotational state N = 0 and N = 1 of the S 1 ( 1B 3u) vibrational ground state of pyrazine interacting with background triplet states have been investigated by quantum beat spectroscopy. Mixing of triplet states with different total angular momenta J, excluding nuclear spin, has been established by analysis of sub-natural linewidth quantum beat spectra. Anisotropic quantum beats provide an estimate of the eigenstate hyperfine splittings. Consequences of these observations on the interpretation of previously recorded high-resolution spectra are discussed.
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