Abstract
We report the results of rotational coherence spectroscopy on tolane, tolane–Ar, and tolane–N2. The results on tolane are consistent with a planar geometry for the species. They also provide information about the symmetries of excited vibronic states in the species. The results on the van der Waals complexes provide significant experimental constraints on where the small species bind to tolane. In addition, we report the observation of a rapid excited-state decay process in the complexes and discuss the possible nature of this process.
Highlights
The study of large species by supersonic molecular beam spectroscopies has been a theme of Professor Mitsuo Ito’s for the past decade
rotational coherence spectroscopy (RCS) was implemented by means of the time-resolved fluorescence depletion (TRFD) scheme[4] of picosecond spectroscopy
This is because the TRFD method is a probe of rotational coherences in both the vibronic states connected by the pump pulse
Summary
The study of large species by supersonic molecular beam spectroscopies has been a theme of Professor Mitsuo Ito’s for the past decade. One of the species studied by his group with such techniques is the tolane molecule (diphenyl acetylene). The principal aim of the study has been to obtain structural information about these species. Toward this end we have used rotational coherence spectroscopy (RCS). The RCS results on bare tolane provide information pertaining to the transition-moment directions of several vibronic bands of the species. This information suggests an assignment for the electronic structure of the molecule that is consistent with that of Reference. Section V. is a discussion of two topics: the assignment of vibronic bands in bare tolane, and the structure and dynamics of tolane-Ar and tolane-N2
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