Vertical spectrum of ethene: uncontracted versus contracted correlation methods and the role of the adapted molecular orbitals

1998 ◽  
Vol 295 (3) ◽  
pp. 181-188 ◽  
Author(s):  
M.Pilar Pérez-Casany ◽  
Ignacio Nebot-Gil ◽  
José Sánchez-Marı́n ◽  
Oscar Castell Marcos ◽  
Jean-Paul Malrieu
2014 ◽  
Vol 43 (29) ◽  
pp. 11209-11215 ◽  
Author(s):  
Benjamin Meyer ◽  
Alex Domingo ◽  
Tim Krah ◽  
Vincent Robert

The influence of the molecular orbitals on charge transfer (CT) reactions is analyzed through wave function-based calculations.


2004 ◽  
Vol 18 (16) ◽  
pp. 825-831 ◽  
Author(s):  
E. B. STARIKOV

Electron spectra of DNA model compounds, adenosine-thymidine and guanosine-cytidine nucleoside base pairs, as well as the relevant homogeneous stacked base pair steps in A-DNA and B-DNA conformations, were investigated using ZINDO semiempirical quantum-chemical method. This work confirms that, in DNA with intact Watson–Crick hydrogen bonding and base stacking, the highest occupied molecular orbitals (HOMO) are residing on purine base residues, whereas the lowest unoccupied molecular orbitals (LUMO) — on pyrimidine base residues. In general, the present results are satisfactorily comparable with the available experimental data. The role of charge transfer excitations in the polymer DNA 260 nm spectral band is discussed.


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