Analytic Morse/long-range potential energy surfaces and "adiabatic-hindered-rotor" treatment for a symmetric top-linear molecule dimer: A case study of CH3F-H-2

作者：Zhang, Xiao-Long; Ma, Yong-Tao; Zhai, Yu; Li, Hui^*

来源：Journal of Chemical Physics, 2018, 148(12): 124302.

DOI：10.1063/1.5024451

• HIGH-RESOLUTION SPECTROSCOPY
• INFRARED-SPECTRUM
• DIPOLE POLARIZABILITY
• SOLID PARAHYDROGEN
• WATER
• ROTATION
• MATRIX
• STATES
• ATOMS
• H-2

Afirst effective six-dimensional ab initio potential energy surface (PES) for CH3F-H-2 which explicitly includes the intramolecular Q(3) stretching normal mode of the CH3F monomer is presented. The electronic structure computations have been carried out at the explicitly correlated coupled cluster level of theory [CCSD(T)-F12a] with an augmented correlation-consistent triple zeta basis set. Five-dimensional analytical intermolecular PESs for nu(3)(CH3F) = 0 and 1 are then obtained by fitting the vibrationally averaged potentials to the Morse/Long-Range (MLR) potential function form. The MLR function form is applied to the nonlinear molecule-linear molecule case for the first time. These fits to 25 015 points have root-mean-square deviations of 0.74 cm(-1) and 0.082 cm(-1) for interaction energies less than 0.0 cm(-1). Using the adiabatic hindered-rotor approximation, three-dimensional PESs for CH3F-paraH(2) are generated from the 5D PESs over all possible orientations of the hydrogen monomer. The infrared and microwave spectra for CH3F-paraH(2) dimer are predicted for the first time. These analytic PESs can be used for modeling the dynamical behavior in CH3F-(H-2)(N) clusters, including the possible appearance of microscopic superfluidity. Published by AIP Publishing.

• 出版日期2018-3-28
• 单位吉林大学