Resonant ion dip infrared spectroscopy (RIDIRS) of benzene-(methanol){sub m} hydrogen-bonded clusters
- Purdue Univ., West Lafayette, IN (United States)
Infrared spectra of benzene-(methanol){sub m} clusters formed in a jet-cooled molecular beam are recorded in the methanol {nu}{sub 1} O-H stretch region (3100 to 3800 cm{sup -1}). RIDIRS utilizes Resonant 2-Photon Ionization Time-of-Flight Mass Spectroscopy (R2PI-TOFMS) to monitor a size selected cluster`s ion signal which is proportional to its neutral ground state population. The tunable infrared output of a Nd:YAG-pumped OPO system is spatially overlapped with the R2PI near-UV pulsed laser beam and precedes it by 80 ns. When in resonance with an infrared transition, population is removed from the cluster`s neutral ground state prior to ionization, producing a dip in the R2PI ion signal. Experimental hydrogen-bond vibrational signatures (i.e. vibrational frequency shifts and changes in band widths), along with ab initio calculations, provide structural information about each cluster. Chain structures exist for benzene-(methanol), and methanol cyclic structures are attached to benzene in benzene-(methanol).
- OSTI ID:
- 437234
- Report Number(s):
- CONF-9606118--
- Country of Publication:
- United States
- Language:
- English
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