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Halpern AM, Glendening ED. An intrinsic reaction coordinate calculation of the torsion-internal rotation potential of hydrogen peroxide and its isotopomers. J Chem Phys. 2004;121(1):273-9doi: 10.1063/1.1756858.
Halpern, A. M., & Glendening, E. D. (2004). An intrinsic reaction coordinate calculation of the torsion-internal rotation potential of hydrogen peroxide and its isotopomers. The Journal of chemical physics, 121(1), 273-9. https://doi.org/10.1063/1.1756858
Halpern, Arthur M, and Glendening, Eric D. "An intrinsic reaction coordinate calculation of the torsion-internal rotation potential of hydrogen peroxide and its isotopomers." The Journal of chemical physics vol. 121,1 (2004): 273-9. doi: https://doi.org/10.1063/1.1756858
Halpern AM, Glendening ED. An intrinsic reaction coordinate calculation of the torsion-internal rotation potential of hydrogen peroxide and its isotopomers. J Chem Phys. 2004 Jul 01;121(1):273-9. doi: 10.1063/1.1756858. PMID: 15260545.
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J Chem Phys. 2004 Jul 01;121(1):273-9. doi: 10.1063/1.1756858.

An intrinsic reaction coordinate calculation of the torsion-internal rotation potential of hydrogen peroxide and its isotopomers.

The Journal of chemical physics

Arthur M Halpern, Eric D Glendening

Affiliations

  1. Department of Chemistry, Indiana State University, Terre Haute, Indiana 47809, USA. [email protected]

PMID: 15260545 DOI: 10.1063/1.1756858

Abstract

Intrinsic reaction coordinate (IRC) calculations of the internal rotation (torsional) potentials for H(2)O(2) and its isotopomers HDO(2) and D(2)O(2) were carried out at the CCSD(T)/CBS//aug-cc-pVDZ level. Two extrapolation methods were used to obtain energies in the complete basis set (CBS) limit. The full IRC potential was constructed from scans from the C(2v) (cis) and C(2h) (trans) transition states to the equilibrium C(2) (gauche) structure. The IRC potential for H(2)O(2) was fit to a five-term Fourier function; coefficients were compared with values obtained from spectroscopic data. The twofold IRC torsional potentials were used to obtain torsional eigenvalues, which yielded values of the transitions between various ntau states. These results compare favorably with Raman and near-infrared data. Our calculations provide values of the cis and trans barriers of 2495 and 364 cm(-1), respectively, which are in good agreement with both previously calculated and experimentally derived values. It appears that coupling between torsional motion and other degrees of freedom is not significant in these molecules.

(c) 2004 American Institute of Physics.

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