Non-adiabatic dynamics simulation exploration of the wavelength-dependent photoinduced relaxation mechanism of trans-N-1-methyl-2-(tolylazo) imidazole in the gas phase

RSC Advances ◽  
2016 ◽  
Vol 6 (69) ◽  
pp. 64323-64331 ◽  
Author(s):  
Li Zhao ◽  
Pan-Wang Zhou ◽  
Guang-Jiu Zhao
Keyword(s):  
Ab Initio ◽  
Gas Phase ◽  
Excited States ◽  
Relaxation Mechanism ◽  
Dynamics Simulation ◽  
Relaxation Dynamics ◽  
Surface Hopping ◽  
Electronic Excited States ◽  
Comprehensive Picture ◽  
Adiabatic Dynamics

A comprehensive picture of the photoinduced non-adiabatic relaxation dynamics of trans-N-1-methyl-2-(tolylazo) imidazole (trans-MTAI) in different electronic excited states has been revealed using the on-the-fly surface hopping method at the ab initio CASSCF level.

scholarly journals Insights into the deactivation of 5-bromouracil after ultraviolet excitation

2017 ◽  
Vol 375 (2092) ◽  
pp. 20160202 ◽  
Author(s):  
Francesca Peccati ◽  
Sebastian Mai ◽  
Leticia González
Keyword(s):  
Gas Phase ◽  
Ground State ◽  
Surface Hopping ◽  
Ultraviolet Excitation ◽  
Quantum Chemistry Calculations ◽  
Electronic Structure Methods ◽  
Dna Strands ◽  
Potential Applications ◽  
Adiabatic Dynamics ◽  
Dynamics Simulations

5-Bromouracil is a nucleobase analogue that can replace thymine in DNA strands and acts as a strong radiosensitizer, with potential applications in molecular biology and cancer therapy. Here, the deactivation of 5-bromouracil after ultraviolet irradiation is investigated in the singlet and triplet manifold by accurate quantum chemistry calculations and non-adiabatic dynamics simulations. It is found that, after irradiation to the bright ππ * state, three main relaxation pathways are, in principle, possible: relaxation back to the ground state, intersystem crossing (ISC) and C–Br photodissociation. Based on accurate MS-CASPT2 optimizations, we propose that ground-state relaxation should be the predominant deactivation pathway in the gas phase. We then employ different electronic structure methods to assess their suitability to carry out excited-state dynamics simulations. MRCIS (multi-reference configuration interaction including single excitations) was used in surface hopping simulations to compute the ultrafast ISC dynamics, which mostly involves the 1 n O π * and 3 ππ * states. This article is part of the themed issue ‘Theoretical and computational studies of non-equilibrium and non-statistical dynamics in the gas phase, in the condensed phase and at interfaces’.

The 1A1 electronic excited states of H2CS: an ab initio MRD CI study

1991 ◽  
Vol 183 (3-4) ◽  
pp. 204-208 ◽  
Author(s):  
M. Hachey ◽  
F. Grein ◽  
R.P. Steer
Keyword(s):  
Ab Initio ◽  
Excited States ◽  
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.

Insight into the light-induced spin crossover of [Fe(bpy)3]2+ in aqueous solution from molecular dynamics simulation of d–d excited states

2016 ◽  
Vol 18 (6) ◽  
pp. 4789-4799 ◽  
Author(s):  
Satoru Iuchi ◽  
Nobuaki Koga
Keyword(s):  
Molecular Dynamics ◽  
Aqueous Solution ◽  
Molecular Dynamics Simulation ◽  
Molecular Dynamics Simulations ◽  
Excited States ◽  
Spin Crossover ◽  
Dynamics Simulation ◽  
Relaxation Dynamics ◽  
Dynamics Simulations ◽  
Insight Into

Lifetimes of triplet d–d states were evaluated through molecular dynamics simulations to gain insight into relaxation dynamics of aqueous [Fe(bpy)3]2+.

Ab Initio Molecular Dynamics Study of Plutonium (IV) Solvation

2012 ◽  
Vol 1475 ◽  
Author(s):  
Ian Kirker ◽  
Nikolas Kaltsoyannis
Keyword(s):  
Molecular Dynamics ◽  
Molecular Dynamics Simulation ◽  
Ab Initio ◽  
Gas Phase ◽  
Conclusive Evidence ◽  
Dynamics Simulation ◽  
Ab Initio Molecular Dynamics ◽  
Simulated Environment ◽  
Water Hydrolysis ◽  
Simulation Time

ABSTRACTGas phase-optimized structures are used to assemble an ab initio molecular dynamics simulation of plutonium (IV) solvated in water. Hydrolysis is observed, and results are compared to experimental EXAFS data.While simulation time is insufficient to be conclusive, evidence suggests that the 7-coordinate singly-hydrolysed complex, [Pu (OH) (OH2)6]3+, is most stable in our simulated environment. Energetic differences between the gas-phase optimised structure and the prevalent dynamic simulation structure are shown to be relatively small.

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