Ganyecz, Ádám and Csontos, József and Nagy, Balázs and Kállay, Mihály (2015) Theoretical and Thermochemical Network Approaches To Determine the Heats of Formation for HO2 and Its Ionic Counterparts. JOURNAL OF PHYSICAL CHEMISTRY A, 119 (7). pp. 1164-1176. ISSN 1089-5639
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Abstract
The purpose of this study is to give reliable and accurate thermochemical data for HO2, HO2+, and HO2. Their heats of formation were determined using quantum chemical calculations with the aid of high-accuracy coupled-cluster methods taking account of zero-point vibrational energies, scalar-relativistic effects, and the deficiencies of the Born-Oppenheimer approximation. Furthermore, a thermochemical network, containing 14 experimental and 7 theoretical reaction enthalpies, was set up to determine even more accurate heats of formation. The iteratively reweighted least-squares solution of the network yielded the best heat of formation estimates, which are Delta H-f(0)degrees(HO2) = 14.85 +/- 0.22, Delta H-f(298)degrees(HO2) = 11.92 +/- 0.22, Delta H-f(0)degrees(HO2+) = 1110.56 +/- 0.40, Delta H-f(298)degrees(HO2+) = 1107.64 +/- 0.40, Delta H-f(0)degrees(HO2) = -89.04 +/- 0. 39, and Delta H-f(298)degrees(HO2) = -91.75 +/- 0.39 kJ/mol. In addition, in line with previous accurate data Delta H-f(0)degrees(OH) = 37.25 +/- 0.03, Delta H-f(0)degrees(OH+) = 1293.20 +/- 0.03, and Delta H-f(0)degrees(H2O2) = -129.48 +/- 0.06 kJ/mol were also delivered by our network.
Item Type: | Article |
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Uncontrolled Keywords: | ELECTRON-AFFINITIES; TEMPERATURE-DEPENDENCE; vibrational frequencies; PHOTOELECTRON-SPECTROSCOPY; GAS-PHASE ACIDITY; BOND-DISSOCIATION ENERGY; HYDROPEROXYL RADICAL HO2; GAUSSIAN-BASIS SETS; AB-INITIO THERMOCHEMISTRY; CORRELATED MOLECULAR CALCULATIONS |
Subjects: | Q Science / természettudomány > QD Chemistry / kémia > QD02 Physical chemistry / fizikai kémia |
SWORD Depositor: | MTMT SWORD |
Depositing User: | MTMT SWORD |
Date Deposited: | 29 Sep 2017 14:02 |
Last Modified: | 29 Sep 2017 14:02 |
URI: | http://real.mtak.hu/id/eprint/64398 |
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