Journal
JOURNAL OF MOLECULAR SPECTROSCOPY
Volume 386, Issue -, Pages -Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jms.2022.111630
Keywords
Waveguide FTMW rotational spectrum; MMW rotational spectrum; Sextic centrifugal distortion; Excited vibrational states; Anharmonic force field calculations
Funding
- Interdisciplinary Center of Mathematical and Computer Modelling (ICM) of Warsaw University, Poland [G61-6 (G87-1142)]
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In this study, the rotational spectrum of phenol was re-investigated, and the data sets for the ground state and the two lowest excited vibrational states were significantly extended. The transitions in other higher vibrational states were assigned and fitted for the first time. The precise measurement of different transition types allowed for the determination and comparison of the sextic centrifugal distortion constants for the ground state.
The room temperature rotational spectrum of phenol has been reinvestigated at 8-18 GHz with a waveguide Fourier transform microwave spectrometer and at 90-137 GHz with a harmonic generation spectrometer. The supersonic expansion spectrum was also measured at 9-18 GHz with a cavity Fourier transform microwave spectrometer. The data sets for the ground state and the two lowest excited vibrational states have been considerably extended, resulting in significant improvement of the spectroscopic parameters. In particular, access to different transition types facilitated by the waveguide spectrometer allowed precise determination of sextic centrifugal distortion constants for the ground state and their intercomparison with computed values. Transitions in the next five higher vibrational states have been assigned and fitted for the first time, and the vibrational assignment was confirmed by computed inertial defects and vibrational changes in rotational constants.
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