Effect of nonadiabaticity of electron-vibrational motions on the energy of electron-vibrational states of polyatomic molecules

1987 ◽  
Vol 47 (5) ◽  
pp. 1169-1174
Author(s):  
V. I. Baranov ◽  
Yu. V. Nefedov

2003 ◽  
Vol 02 (04) ◽  
pp. 609-620 ◽  
Author(s):  
FABIENNE RIBEIRO ◽  
CHRISTOPHE IUNG ◽  
CLAUDE LEFORESTIER

We described an improved version of a modified Davidson scheme previously introduced (F. Ribeiro, C. Iung and C. Leforestier, Chem. Phys. Lett.362, 199 (2002)), aimed at computing highly excited energy levels of polyatomic molecules. The key ingredient is a prediagonalization-perturbation step performed on a subspace of a curvilinear normal modes basis set (including diagonal anharmonicities). The efficiency of the method is demonstrated by computing the lowest 350 vibrational states of A′ symmetry of the HFCO molecule. Also shown is the possibility to restrict the calculation to selected energy levels, based on their zero-order description. This State Filtered Diagonalization method is illustrated on a high overtone (7ν5) of the OCF bend, and on the few energy levels (20) which have been experimentally assigned up to 5000 cm -1 of excitation energy.





1982 ◽  
Vol 89 (2) ◽  
pp. 171-173 ◽  
Author(s):  
R.B. Gerber ◽  
Victoria Buch ◽  
M.A. Ratner


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