Journal article
Accurate calculation of the dissociation energy of the highly anharmonic system ClHCl(-)
The journal of physical chemistry. A, Molecules, spectroscopy, kinetics, environment, & general theory, Vol.119(21), pp.5158-5164
05/28/2015
Handle:
https://hdl.handle.net/2376/116557
PMID: 25405989
Abstract
Accurate bond dissociation energies (D0) are reported for different isotopologues of the highly anharmonic system ClHCl(-). The mass-independent equilibrium dissociation energy De was obtained by a composite method with frozen-core (fc) CCSD(T) as the basic contribution. Basis sets as large as aug-cc-pV8(+d)Z were employed, and extrapolation to the complete basis set (CBS) limit was carried out. Explicitly correlated calculations with the CCSD(T)-F12b method were also performed to support the conventionally calculated values. Core-core and core-valence correlation, scalar relativity, and higher-order correlation were considered as well. Two mass-dependent contributions, namely, the diagonal Born-Oppenheimer correction and the difference in zero-point energies between the complex and the HCl fragment, were then added in order to arrive at precise D0 values. Results for (35)ClH(35)Cl(-) and (35)ClD(35)Cl(-) are 23.81 and 23.63 kcal/mol, respectively, with estimated uncertainties of 0.05 kcal/mol. In contrast to FHF(-) ( Stein , C. ; Oswald , R. ; Sebald , P. ; Botschwina , P. ; Stoll , H. , Peterson , K. A. Mol. Phys. 2013 , 111 , 2647 - 2652 ), the D0 values of the bichloride species are larger than their De counterparts, which is an unusual situation in hydrogen-bonded systems.
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Details
- Title
- Accurate calculation of the dissociation energy of the highly anharmonic system ClHCl(-)
- Creators
- Christopher Stein - †Institute of Physical Chemistry, University of Göttingen, Tammannstraße 6, 37077 Göttingen, GermanyRainer Oswald - †Institute of Physical Chemistry, University of Göttingen, Tammannstraße 6, 37077 Göttingen, GermanyPeter Botschwina - †Institute of Physical Chemistry, University of Göttingen, Tammannstraße 6, 37077 Göttingen, GermanyKirk A Peterson - ‡Department of Chemistry, Washington State University, Pullman, Washington 99164-4630, United States
- Publication Details
- The journal of physical chemistry. A, Molecules, spectroscopy, kinetics, environment, & general theory, Vol.119(21), pp.5158-5164
- Academic Unit
- Chemistry, Department of
- Publisher
- United States
- Identifiers
- 99900547590301842
- Language
- English
- Resource Type
- Journal article