scholarly journals Interstate vibronic coupling constants between electronic excited states for complex molecules

2018 ◽  
Vol 148 (12) ◽  
pp. 124119 ◽  
Author(s):  
Maria Fumanal ◽  
Felix Plasser ◽  
Sebastian Mai ◽  
Chantal Daniel ◽  
Etienne Gindensperger
Keyword(s):  
Excited States ◽  
Vibronic Coupling ◽  
Coupling Constants ◽  
Complex Molecules ◽  
Electronic Excited States

scholarly journals Vibronic coupling in the excited-states of carotenoids

2016 ◽  
Vol 18 (16) ◽  
pp. 11443-11453 ◽  
Author(s):  
Takeshi Miki ◽  
Tiago Buckup ◽  
Marie S. Krause ◽  
June Southall ◽  
Richard J. Cogdell ◽  
...  
Keyword(s):  
Excited State ◽  
Excited States ◽  
Vibronic Coupling ◽  
Relaxation Dynamics ◽  
Dark State ◽  
Electronic Excited States

The ultrafast femtochemistry of carotenoids is governed by the interaction between electronic excited states, which has been explained by the relaxation dynamics within a few hundred femtoseconds from the lowest optically allowed excited state S2to the optically dark state S1.

Strong Pseudo Jahn–Teller Effect on the Single Hexagonal Unit of Germanene

MRS Advances ◽  
2016 ◽  
Vol 1 (22) ◽  
pp. 1591-1596 ◽  
Author(s):  
J. R. Soto ◽  
B. Molina ◽  
J. J. Castro
Keyword(s):  
Dft Calculations ◽  
Excited States ◽  
Density Functional ◽  
Coupling Model ◽  
Vibronic Coupling ◽  
Coupling Constants ◽  
Hybrid Functional ◽  
Jahn Teller ◽  
Jahn Teller Effect ◽  
Different Origins

ABSTRACTGermanene, the 2D graphene-like Ge nanosheet, has been recently the subject of many theoretical studies and experimental attempts to synthesize it on Ag(111), Au(111) and Pt(111) surfaces. The experimental and theoretical evidences of germanene show a 2D continuous honeycomb layer with a buckled conformation. Density functional theory (DFT) calculations have predicted a larger buckling for germanene than silicene whose origin is also associated with a pseudo Jahn–Teller (PJT) effect. In this work we show that despite the fact that both, silicene and germanene possess a buckled conformation with a PJT origin, their vibronic coupling have different origins. The analysis is based on the PJT puckering instability of the hexagermabenzene molecule, the single hexagonal unit of germanene. This is done through the linear vibronic coupling model between the ground and the lowest excited states, which leads to a puckering distortion of the more symmetric cluster. We study both, the multilevel superposition vibronic model and possible mixing of excited states of different irreducible representations, which have been used to show the origin of similar structural transitions in hexagonal silicon and gold ring systems respectively. We show that contrary to other cases with one six-member rings, for the hexagermabenzene molecule a mixture of both the multilevel PJT and a ground state coupling with two quasi-degenerate excited states is necessary for a satisfactory explanation of puckering. Our model allows a determination of the coupling constants and predicts simultaneously the Adiabatic Potential Energy Surface (APES) behavior for the ground and excited states around the maximum symmetry point. The analysis is based on a scalar relativistic DFT and time-dependent DFT (TD-DFT) calculations in the Zero Order Regular Approximation (ZORA) using the B3LYP hybrid functional.

Excited State Tracking During the Relaxation of Coordination Compounds

2018 ◽  
Author(s):  
Juan Sanz García ◽  
Martial Boggio-Pasqua ◽  
Ilaria Ciofini ◽  
Marco Campetella
Keyword(s):  
Excited State ◽  
Excited States ◽  
Potential Energy Surfaces ◽  
Photochemical Reactions ◽  
Complex Nature ◽  
Electronic Excited States ◽  
Ruthenium Nitrosyl ◽  
State Tracking ◽  
Energy Surfaces ◽  
Electronic Wavefunction

<div>The ability to locate minima on electronic excited states (ESs) potential energy surfaces (PESs) both in the case of bright and dark states is crucial for a full understanding of photochemical reactions. This task has become a standard practice for small- to medium-sized organic chromophores thanks to the constant developments in the field of computational photochemistry. However, this remains a very challenging effort when it comes to the optimization of ESs of transition metal complexes (TMCs), not only due to the presence of several electronic excited states close in energy, but also due to the complex nature of the excited states involved. In this article, we present a simple yet powerful method to follow an excited state of interest during a structural optimization in the case of TMC, based on the use of a compact hole-particle representation of the electronic transition, namely the natural transition orbitals (NTOs). State tracking using NTOs is unambiguously accomplished by computing the mono-electronic wavefunction overlap between consecutive steps of the optimization. Here, we demonstrate that this simple but robust procedure works not only in the case of the cytosine but also in the case of the ES optimization of a ruthenium-nitrosyl complex which is very problematic with standard approaches.</div>

scholarly journals Erratum to: Theoretical Study of the Electronic Excited States and Fluorescence Spectra of Squaraine in Solution

2014 ◽  
Vol 43 (9-10) ◽  
pp. 1644-1644
Author(s):  
Hitoshi Ozawa ◽  
Kazunori Yashiro ◽  
Takuma Yamamoto ◽  
Satoshi Yabushita
Keyword(s):  
Excited States ◽  
Fluorescence Spectra ◽  
Theoretical Study ◽  
Electronic Excited States

Theoretical Study of the Electronic Excited States of Tetracyanoethylene and Its Radical Anion

ChemPhysChem ◽  
2005 ◽  
Vol 6 (3) ◽  
pp. 503-510 ◽  
Author(s):  
Begoña Milián ◽  
Rosendo Pou-Amérigo ◽  
Manuela Merchán ◽  
Enrique Ortí
Keyword(s):  
Excited States ◽  
Radical Anion ◽  
Theoretical Study ◽  
Electronic Excited States
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