Electronic structure and spectroscopy of the ground and excited states of the HMgO and HMgS radicals - Theoretical chemistry Accéder directement au contenu
Article Dans Une Revue Chemical Physics Année : 2003

Electronic structure and spectroscopy of the ground and excited states of the HMgO and HMgS radicals

S. Lahmar
  • Fonction : Auteur
Z. Ben Lakhdar
  • Fonction : Auteur
M. Diehr
  • Fonction : Auteur
P. Rosmus
  • Fonction : Auteur
Gilberte Chambaud
  • Fonction : Auteur

Résumé

Ab initio RCCSD(T) and MRCI calculations have been carried out for the stable isomer forms of magnesium monohydroxide, HMgO and monohydro sulfide, HMgS. For both molecular systems, it is found that the electronic ground state is a (2)Pi(i) state with linear/linear Renner-Teller components. At the equilibrium geometry of the ground states, the spin-orbit constants A(SO) have been calculated -123 cm(-1) for HMgO and -312 cm(-1) for HMgS. Along the isomerisation path towards the more stable structures MgOH and MgSH, the (2)A' component of the Renner Teller pair correlates with the ground state and the (2)A" component with an excited state. Using RCCSD(T) potential energy functions and a variational Renner-Teller approach, rovibronic levels of the X(2)Pi state of both systems have been evaluated for J = 1/2 and 3/2. Strong Fermi resonances are found in HMgO, but not in HMgS. The first electronically excited (2)Sigma(divided by) states are calculated (T-e value at RCCSD(T) level) to lie 8041 cm(-1) above the ground state for HMgS and 4935 cm(-1) for HMgO. (C) 2003 Elsevier B.V. All rights reserved.

Dates et versions

hal-00693501 , version 1 (02-05-2012)

Identifiants

Citer

A. Zaidi, S. Lahmar, Z. Ben Lakhdar, M. Diehr, P. Rosmus, et al.. Electronic structure and spectroscopy of the ground and excited states of the HMgO and HMgS radicals. Chemical Physics, 2003, 295 (1), pp.89--95. ⟨10.1016/j.chemphys.2003.08.010⟩. ⟨hal-00693501⟩
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