Non-uniqueness of quantum transition state theory and general dividing surfaces in the path integral space
- City Univ. of New York (CUNY), NY (United States). Queens College
- Univ. of Chicago, IL (United States). James Franck Inst.
Despite the fact that quantum mechanical principles do not allow the establishment of an exact quantum analogue of the classical transition state theory (TST), the development of a quantum TST (QTST) with a proper dynamical justification, while recovering the TST in the classical limit, has been a long standing theoretical challenge in chemical physics. One of the most recent efforts of this kind was put forth by Hele and Althorpe (HA) [J. Chem. Phys. 138, 084108 (2013)], which can be specified for any cyclically invariant dividing surface defined in the space of the imaginary time path integral. The present work revisits the issue of the non-uniqueness of QTST and provides a detailed theoretical analysis of HA-QTST for a general class of such path integral dividing surfaces. While we confirm that HA-QTST reproduces the result based on the ring polymer molecular dynamics (RPMD) rate theory for dividing surfaces containing only a quadratic form of low frequency Fourier modes, we find that it produces different results for those containing higher frequency imaginary time paths which accommodate greater quantum fluctuations. This result confirms the assessment made in our previous work [Jang and Voth, J. Chem. Phys. 144, 084110 (2016)] that HA-QTST does not provide a derivation of RPMD-TST in general and points to a new ambiguity of HA-QTST with respect to its justification for general cyclically invariant dividing surfaces defined in the space of imaginary time path integrals. Our analysis also offers new insights into similar path integral based QTST approaches.
- Research Organization:
- Queens College (CUNY), NY (United States); City Univ. of New York (CUNY), NY (United States); Univ. of Chicago, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division; National Science Foundation (NSF)
- Contributing Organization:
- University of Chicago
- Grant/Contract Number:
- SC0001393; CHE-1362926; CHE-1465248
- OSTI ID:
- 1465983
- Alternate ID(s):
- OSTI ID: 1361846; OSTI ID: 1755033
- Report Number(s):
- DOE-Queens-1393-19; CHE- 1465248
- Journal Information:
- Journal of Chemical Physics, Vol. 146, Issue 17; ISSN 0021-9606
- Publisher:
- American Institute of Physics (AIP)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
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Related Subjects
GENERAL PHYSICS
polymers
carbon dioxide
classical mechanics
correlation functions
molecular dynamics
quantum fluctuations
transition state theory
surface dynamics
classical ensemble theory
quantum measurement theory
Quantum transition state theory
Uniqueness of rate expression
Path integral