Abstract
The ab initio intra- and inter-molecular potential energy surfaces (PESs) for the H2O-Ne system that explicitly incorporate the intramolecular overtone state (vOH = 2) of H2O are presented. The electronic structure computations have been carried out at the explicitly correlated coupled cluster theory [CCSD(T)-F12] level with an augmented correlation-consistent triple zeta basis set and an additional bond function. The vibrationally averaged three-dimensional intermolecular potentials for |00+〉, |02+〉, |02-〉 and |11+〉 are obtained analytically by fitting to the multi-dimensional Morse/Long-range potential function form. These fits to 46 980 points have a root-mean-square (RMS) discrepancy of 0.12 cm-1 for interaction energies less than 1000.0 cm-1. With the vibrationally averaged PESs for the H2O-Ne, we employed the combined radial discrete variable representation/angular finite basis representation method and Lanczos algorithm to calculate rovibrational energy levels (J = 0-10, ns ≤ 2). The predicted infrared transitions and intensities of the para- and ortho-H2O-Ne complex are in good agreement with the available experimental data for |02-〉 ← |00+〉, |02+〉 ← |00+〉 transitions. In particular, the RMS discrepancy for |02-〉∑e(000,0) ← |00+〉∑e(101,0), including P and R branch patterns, is only 0.045 cm-1, which is comparable with the experimental values. These results will provide reliable theoretical guidance for the future infrared overtone spectroscopy of clusters.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.