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Na2O and Na2O+: Thermodynamics and low-lying electronic states

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High-level [up to RCCSD(T)/aug-cc-pV5S'//RCCSD/aug-cc-pVQZ'] ab initio calculations are performed on Na2O and Na2O+ (where the 'indicates a nonstandard aug-cc-pVXZ basis set). The electronic groundstate equilibrium geometries are found to be linear in both cases. The heats of formation, Delta H-f(298)(Na2O) and Delta Hf-298(Na2O+), are derived, with the recommended values being Delta H-f(298)(Na2O) = -5.5 +/- 1.0 kcal mol(-1) and Delta H-f(298)(Na2O+) = 106.7 +/- 0.5 kcal mol(-1), respectively. It is found that large basis sets, the RCCSD(T) method, and appropriate account of basis set superposition error (BSSE) are necessary in order to obtain reliable results. S-298 for Na2O and Na2O+ are also calculated giving 67 and 63 cal K-1 mol(-1), respectively. The calculations also yield Delta H-a(298)(Na2O)= 115.5 +/- 1 kcal mol(-1) and Do(NaO Na) = 52 +/- 1 kcal mol(-1) The adiabatic ionization energy of Na2O is calculated as 4.86 +/- 0.02 eV and corresponds to the process Na2O+((XIIu)-I-2) + e(-) <-- Na2O(X(1)Sigma(g)(divided by)); the corresponding vertical ionization energy is calculated to be 5.00 +/- 0.02 eV. The ground state of Na2O+ is established as the (IIu)-I-2 state, with the A(2)Sigma(u)(+) state lying ca. 0.65 eV above. The low:lying triplet states of Na2O are briefly considered. The implication of the present results on the mass spectrometry of the vapor above Na2O is discussed.

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Soldan, P., Lee, E. P. F., Gamblin, S. D. and Wright, T. G. (2000) Na2O and Na2O+: Thermodynamics and low-lying electronic states Journal of Physical Chemistry A, 104, (15), pp. 3317-3325. (doi:10.1021/jp994350n).

More information

Published date: 20 April 2000
Keywords: alkaline-earth oxides, vaporization behavior, total energies, sodium-oxide, oxygen, heat, ionization, clusters, nao, g2


Local EPrints ID: 18957
ISSN: 1089-5639
PURE UUID: ddd3de98-73b7-4715-963e-ff28aa3afdce

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Date deposited: 05 Jan 2006
Last modified: 17 Jul 2017 16:34

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Author: P. Soldan
Author: E. P. F. Lee
Author: S. D. Gamblin
Author: T. G. Wright

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