We study large amplitude motions of methyl group in 9-methylanthracene (9MA) by high-resolution spectroscopy. 9MA molecules are delivered in a supersonic beam and are excited by a single mode Ti:Sapphire laser.
The frequency of the laser is controlled with reference to an Er doped fiber optical frequency comb.
The figure is the observed rovibronic spectra of S$_1(0a_1') \leftarrow$ S$_0(0a_1')$
and
S$_1(1e'') \leftarrow$ S$_0(1e'')$
transitions.
Although the two transitions are overlapped, the rotational lines are well resolved.
Now we try to assign the rotational lines and to analyze interactions in the vibronic excited states.
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