scholarly journals Photofragmentation of Gas-Phase Lanthanide Cyclopentadienyl Complexes: Experimental and Time-Dependent Excited-State Molecular Dynamics

2014 ◽  
Vol 33 (7) ◽  
pp. 1574-1586 ◽  
Author(s):  
Jiangchao Chen ◽  
Andrew M. Hochstatter ◽  
Dmitri Kilin ◽  
P. Stanley May ◽  
Qingguo Meng ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Excited State ◽  
Gas Phase ◽  
Time Dependent ◽  
Cyclopentadienyl Complexes

Photorelaxation of imidazole and adenine via electron-driven proton transfer along H2O wires

2016 ◽  
Vol 195 ◽  
pp. 237-251 ◽  
Author(s):  
Rafał Szabla ◽  
Robert W. Góra ◽  
Mikołaj Janicki ◽  
Jiří Šponer
Keyword(s):  
Molecular Dynamics ◽  
Excited State ◽  
Potential Energy ◽  
Proton Transfer ◽  
Potential Energy Surface ◽  
Molecular Dynamics Simulations ◽  
Gas Phase ◽  
Energy Surface ◽  
Water Molecules ◽  
Dynamics Simulations

Photochemically created πσ* states were classified among the most prominent factors determining the ultrafast radiationless deactivation and photostability of many biomolecular building blocks. In the past two decades, the gas phase photochemistry of πσ* excitations was extensively investigated and was attributed to N–H and O–H bond fission processes. However, complete understanding of the complex photorelaxation pathways of πσ* states in the aqueous environment was very challenging, owing to the direct participation of solvent molecules in the excited-state deactivation. Here, we present non-adiabatic molecular dynamics simulations and potential energy surface calculations of the photoexcited imidazole–(H2O)5 cluster using the algebraic diagrammatic construction method to the second-order [ADC(2)]. We show that electron driven proton transfer (EDPT) along a wire of at least two water molecules may lead to the formation of a πσ*/S0 state crossing, similarly to what we suggested for 2-aminooxazole. We expand on our previous findings by direct comparison of the imidazole–(H2O)5 cluster to non-adiabatic molecular dynamics simulations of imidazole in the gas phase, which reveal that the presence of water molecules extends the overall excited-state lifetime of the chromophore. To embed the results in a biological context, we provide calculations of potential energy surface cuts for the analogous photorelaxation mechanism present in adenine, which contains an imidazole ring in its structure.

scholarly journals Non-adiabatic excited state molecular dynamics of phenylene ethynylene dendrimer using a multiconfigurational Ehrenfest approach

2016 ◽  
Vol 18 (15) ◽  
pp. 10028-10040 ◽  
Author(s):  
Sebastian Fernandez-Alberti ◽  
Dmitry V. Makhov ◽  
Sergei Tretiak ◽  
Dmitrii V. Shalashilin
Keyword(s):  
Molecular Dynamics ◽  
Energy Transfer ◽  
Excited State ◽  
Building Blocks ◽  
Time Dependent ◽  
Phenylene Ethynylene

Photoinduced dynamics of electronic and vibrational unidirectional energy transfer between meta-linked building blocks in a phenylene ethynylene dendrimer is simulated using a multiconfigurational Ehrenfest in time-dependent diabatic basis (MCE-TDDB) method.

scholarly journals Time-dependent density functional theory molecular dynamics simulation of doubly charged uracil in gas phase

Open Physics ◽  
2014 ◽  
Vol 12 (2) ◽  
Author(s):  
Pablo López-Tarifa ◽  
Marie-Anne Hervé du Penhoat ◽  
Rodophe Vuilleumier ◽  
Marie-Pierre Gaigeot ◽  
Ursula Rothlisberger ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Density Functional Theory ◽  
Gas Phase ◽  
Density Functional ◽  
Time Dependent ◽  
Dynamics Simulation ◽  
Functional Theory ◽  
Fragmentation Patterns ◽  
Doubly Charged ◽  
Dependent Density

AbstractWe use time-dependent density functional theory and Born-Oppenheimer molecular dynamics methods to investigate the fragmentation of doubly ionized uracil in gas phase. Different initial electronic excited states of the dication are obtained by removing electrons from different inner-shell orbitals of the neutral species. We show that shape-equivalent orbitals lead to very different fragmentation patterns revealing the importance of the intramolecular chemical environment. The results are in good agreement with ionion coincidence measurements of uracil collision with 100 keV protons.

Excited state Born–Oppenheimer molecular dynamics through coupling between time dependent DFT and AMOEBA

2020 ◽  
Vol 22 (35) ◽  
pp. 19532-19541
Author(s):  
Michele Nottoli ◽  
Benedetta Mennucci ◽  
Filippo Lipparini
Keyword(s):  
Molecular Dynamics ◽  
Density Functional Theory ◽  
Excited State ◽  
Force Field ◽  
Density Functional ◽  
Time Dependent ◽  
Functional Theory ◽  
Amoeba Force Field ◽  
Dependent Density

We present the implementation of excited state Born–Oppenheimer molecular dynamics (BOMD) using a polarizable QM/MM approach based on time-dependent density functional theory (TDDFT) formulation and the AMOEBA force field.

Intramolecular vibrational redistribution in the non-radiative excited state decay of uracil in the gas phase: an ab initio molecular dynamics study

2015 ◽  
Vol 17 (17) ◽  
pp. 11615-11626 ◽  
Author(s):  
Philippe Carbonniere ◽  
Claude Pouchan ◽  
Roberto Improta
Keyword(s):  
Molecular Dynamics ◽  
Excited State ◽  
Ab Initio ◽  
Gas Phase ◽  
Ground State ◽  
Md Simulations ◽  
Ab Initio Molecular Dynamics ◽  
State Decay ◽  
State Recovery

MD simulations provide the first atomistic insights into the IVR processes of photoexcited uracil soon after ground state recovery.

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