scholarly journals Theoretical Studies on the Potential Energy Surfaces of SO2: Electronic States for Photodissociation from the \ ildeC1B2State

1991 ◽  
Vol 64 (9) ◽  
pp. 2792-2801 ◽  
Author(s):  
Kenshu Kamiya ◽  
Hiroyuki Matsui
Keyword(s):  
Potential Energy ◽  
Potential Energy Surfaces ◽  
Electronic States ◽  
Theoretical Studies ◽  
Energy Surfaces

Potential Energy Surfaces

1996 ◽  
Author(s):  
Tomas Baer ◽  
William L. Hase
Keyword(s):  
Potential Energy ◽  
Potential Energy Surface ◽  
Electronic State ◽  
Diatomic Molecule ◽  
Potential Energy Surfaces ◽  
Energy Surface ◽  
Electronic States ◽  
Dissociation Energies ◽  
State Potential ◽  
Energy Surfaces

Properties of potential energy surfaces are integral to understanding the dynamics of unimolecular reactions. As discussed in chapter 2, the concept of a potential energy surface arises from the Born-Oppenheimer approximation, which separates electronic motion from vibrational/rotational motion. Potential energy surfaces are calculated by solving Eq. (2.3) in chapter 2 at fixed values for the nuclear coordinates R. Solving this equation gives electronic energies Eie(R) at the configuration R for the different electronic states of the molecule. Combining Eie(R) with the nuclear repulsive potential energy VNN(R) gives the potential energy surface Vi(R) for electronic state i (Hirst, 1985). Each state is identified by its spin angular momentum and orbital symmetry. Since the electronic density between nuclei is different for each electronic state, each state has its own equilibrium geometry, sets of vibrational frequencies, and bond dissociation energies. To illustrate this effect, vibrational frequencies for the ground singlet state (S0) and first excited singlet state (S1) of H2CO are compared in table 3.1. For a diatomic molecule, potential energy surfaces only depend on the internuclear separation, so that a potential energy curve results instead of a surface. Possible potential energy curves for a diatomic molecule are depicted in figure 3.1. Of particular interest in this figure are the different equilibrium bond lengths and dissociation energies for the different electronic states. The lowest potential curve is referred to as the ground electronic state potential. The primary focus of this chapter is the ground electronic state potential energy surface. In the last section potential energy surfaces are considered for excited electronic states. A unimolecular reactant molecule consisting of N atoms has a multidimensional potential energy surface which depends on 3N-6 independent coordinates. For the smallest nondiatomic reactant, a triatomic molecule, the potential energy surface is four-dimensional (three independent coordinates plus the energy). Since it is difficult, if not impossible, to visualize surfaces with more than three dimensions, methods are used to reduce the dimensionality of the problem in portraying surfaces. In a graphical representation of a surface the potential energy is depicted as a function of two coordinates with constraints placed on the remaining 3N-8 coordinates.

Spectroscopic investigations and potential energy surfaces of the ground and excited electronic states of 1,3-benzodioxan

2009 ◽  
Vol 131 (4) ◽  
pp. 044302 ◽  
Author(s):  
Kathleen McCann ◽  
Martin Wagner ◽  
Aaron Guerra ◽  
Paul Coronado ◽  
J. R. Villarreal ◽  
...  
Keyword(s):  
Potential Energy ◽  
Potential Energy Surfaces ◽  
Electronic States ◽  
Excited Electronic States ◽  
Spectroscopic Investigations ◽  
Energy Surfaces

Dissociative adsorption ofO2on Pt and Au surfaces: Potential-energy surfaces and electronic states

2008 ◽  
Vol 77 (11) ◽  
Author(s):  
Satoshi Yotsuhashi ◽  
Yuka Yamada ◽  
Tomoya Kishi ◽  
Wilson Agerico Diño ◽  
Hiroshi Nakanishi ◽  
...  
Keyword(s):  
Potential Energy ◽  
Potential Energy Surfaces ◽  
Electronic States ◽  
Dissociative Adsorption ◽  
Energy Surfaces

Photodissociation of (CO)+2: Theoretical studies of ground 2Bu and excited 2Bg potential energy surfaces

1987 ◽  
Vol 87 (1) ◽  
pp. 392-410 ◽  
Author(s):  
John T. Blair ◽  
James C. Weisshaar ◽  
John E. Carpenter ◽  
Frank Weinhold
Keyword(s):  
Potential Energy ◽  
Potential Energy Surfaces ◽  
Theoretical Studies ◽  
Energy Surfaces
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