An improved quasi-diabatic representation of the 1, 2, 31 A coupled adiabatic potential energy surfaces of phenol in the full 33 internal coordinates
Journal Article
·
· Journal of Chemical Physics
- Johns Hopkins Univ., Baltimore, MD (United States); Johns Hopkiins University
- Johns Hopkins Univ., Baltimore, MD (United States)
In a previous project we constructed a quasi-diabatic representation, Hd, of the 1, 2, 31A adiabatic states of phenol from high level multireference single and double excitation configuration interaction electronic structure data, energies, energy gradients, and derivative couplings. That Hd accurately describes surface minima, saddle points, and also regions of strong nonadiabatic interactions, reproducing the locus of conical intersection seams and the coordinate dependence of the derivative couplings. The present work determines the accuracy of Hd for describing phenol photodissociation. Additionally, we demonstrate that a modest energetic shift of two diabats yields a quantifiably more accurate Hd compared with experimental energetics. The analysis shows that in favorable circumstances it is possible to use single point energies obtained from the most reliable electronic structure methods available, including methods for which the energy gradients and derivative couplings are not available, to improve the quality of a global representation of several coupled potential energy surfaces. Our data indicate an alternative interpretation of kinetic energy release measurements near λphot ~ 248 nm.
- Research Organization:
- Johns Hopkins Univ., Baltimore, MD (United States); Univ. of California, Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
- Grant/Contract Number:
- FG02-91ER14189
- OSTI ID:
- 1599341
- Alternate ID(s):
- OSTI ID: 1421161
OSTI ID: 22657862
- Journal Information:
- Journal of Chemical Physics, Journal Name: Journal of Chemical Physics Journal Issue: 12 Vol. 144; ISSN 0021-9606
- Publisher:
- American Institute of Physics (AIP)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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