Emitting-state potential energy surface and distortions calculated from the excitation spectrum of bis(hexafluoroacetylacetonato)platinum(II) in a molecular beam

1992 ◽  
Vol 31 (13) ◽  
pp. 2786-2790 ◽  
Author(s):  
Christian Reber ◽  
Jeffrey I. Zink
Keyword(s):  
Potential Energy ◽  
Potential Energy Surface ◽  
Excitation Spectrum ◽  
Molecular Beam ◽  
Energy Surface ◽  
State Potential

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.

Global analytical ab initio ground-state potential energy surface for the C(1D)+H2 reactive system

2014 ◽  
Vol 140 (23) ◽  
pp. 234301 ◽  
Author(s):  
Chunfang Zhang ◽  
Mingkai Fu ◽  
Zhitao Shen ◽  
Haitao Ma ◽  
Wensheng Bian
Keyword(s):  
Potential Energy ◽  
Potential Energy Surface ◽  
Ab Initio ◽  
Ground State ◽  
Energy Surface ◽  
Reactive System ◽  
State Potential

scholarly journals Ultrafast Evolution of the Excited-State Potential Energy Surface ofTiO2Single Crystals Induced by Carrier Cooling

2013 ◽  
Vol 110 (6) ◽  
Author(s):  
Elisabeth M. Bothschafter ◽  
Alexander Paarmann ◽  
Eeuwe S. Zijlstra ◽  
Nicholas Karpowicz ◽  
Martin E. Garcia ◽  
...  
Keyword(s):  
Excited State ◽  
Potential Energy ◽  
Potential Energy Surface ◽  
Energy Surface ◽  
State Potential

scholarly journals Mapping the Excited-State Potential Energy Surface of a Photomolecular Motor

2018 ◽  
Vol 130 (21) ◽  
pp. 6311-6315 ◽  
Author(s):  
Christopher R. Hall ◽  
Wesley R. Browne ◽  
Ben L. Feringa ◽  
Stephen R. Meech
Keyword(s):  
Excited State ◽  
Potential Energy ◽  
Potential Energy Surface ◽  
Energy Surface ◽  
State Potential
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