SIX-DIMENSIONAL MODEL ANALYSIS AND INTERMOLECULAR VIBRATIONAL SPECTROSCOPY OF BENZENE-METHANE vdW COMPLEX

Sasaki, Toru

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Description

Title

SIX-DIMENSIONAL MODEL ANALYSIS AND INTERMOLECULAR VIBRATIONAL SPECTROSCOPY OF BENZENE-METHANE vdW COMPLEX

Author(s)

Sasaki, Toru

Contributor(s)

• Ohshima, Yasuhiro
• Nakamura, Masaaki

Issue Date

2023-06-21

Keyword(s)

Clusters/Complexes

Abstract

The benzene-methane complex is a prototypical model for CH/π interaction. The binding energyᵃ and UV spectraᵇ of this system have been reported and ab initio calculations were performedᶜ. However, full dimensional (6D) intermolecular potential energy surface (IPS) has not been evaluated because of difficulties caused by high dimensionality. In order to reconstruct a full dimensional IPS in the benzene-methane system, stimulated emission pumping and wave-packet observation pertinent to the S₀ state were carried out. The latter was performed as a pump-probe experiment combining impulsive stimulated Raman excitation by femtosecond pulses with state-selective ionization by resonant two-photon ionization. A new 6D model potential analysis was also performed. Single-point energy calculations were performed at CCSD(T)/aug-cc-pVTZ level of theory for 525 different complex configurations, and calculated results were fitted by the new model potential. Observed intermolecular bands were assigned by comparing the theoretical prediction. Deviations of the prediction from the observation are well within 3 cm−¹, which verifies the utility of the present IPS for benzene-methane.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

Text

Language

eng

Handle URL

https://hdl.handle.net/2142/122475

DOI

https://doi.org/10.15278/isms.2023.6795

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