scholarly journals Micro-Solvated DMABN: Excited State Quantum Dynamics and Dual Fluorescence Spectra

Molecules ◽  
2021 ◽  
Vol 26 (23) ◽  
pp. 7247
Author(s):  
Sandra Gómez ◽  
Esra N. Soysal ◽  
Graham A. Worth
Keyword(s):  
Electronic Structure ◽  
Excited State ◽  
Quantum Dynamics ◽  
Computational Study ◽  
Water Solution ◽  
Fluorescence Emission ◽  
Spectroscopic Properties ◽  
Complete Analysis ◽  
Solvent Molecules ◽  
Dynamics Simulations

In this work, we report a complete analysis by theoretical and spectroscopic methods of the short-time behaviour of 4-(dimethylamino)benzonitrile (DMABN) in the gas phase as well as in cyclohexane, tetrahydrofuran, acetonitrile, and water solution, after excitation to the La state. The spectroscopic properties of DMABN were investigated experimentally using UV absorption and fluorescence emission spectroscopy. The computational study was developed at different electronic structure levels and using the Polarisable Continuum Model (PCM) and explicit solvent molecules to reproduce the solvent environment. Additionally, excited state quantum dynamics simulations in the diabatic picture using the direct dynamics variational multiconfigurational Gaussian (DD-vMCG) method were performed, the largest quantum dynamics “on-the-fly” simulations performed with this method until now. The comparison with fully converged multilayer multiconfigurational time-dependent Hartree (ML-MCTDH) dynamics on parametrised linear vibronic coupling (LVC) potentials show very similar population decays and evolution of the nuclear wavepacket. The ring C=C stretching and three methyl tilting modes are identified as the responsible motions for the internal conversion from the La to the Lb states. No major differences are observed in the ultrafast initial decay in different solvents, but we show that this effect depends strongly on the level of electronic structure used.

Electronic structure calculations and nonadiabatic dynamics simulations of excited-state relaxation of Pigment Yellow 101

2018 ◽  
Vol 20 (9) ◽  
pp. 6524-6532 ◽  
Author(s):  
Meng Che ◽  
Yuan-Jun Gao ◽  
Yan Zhang ◽  
Shu-Hua Xia ◽  
Ganglong Cui
Keyword(s):  
Electronic Structure ◽  
Excited State ◽  
Electronic Structure Calculations ◽  
Nonadiabatic Dynamics ◽  
Dynamics Simulations ◽  
Structure Calculations

Pigment Yellow 101 (PY101) is widely used as a typical pigment due to its excellent excited-state properties.

scholarly journals Excited State Absorption of Uracil in the Gas Phase: Mapping the Main Decay Paths by Different Electronic Structure Methods

2020 ◽  
Author(s):  
Daniil Fedotov ◽  
Alexander C. Paul ◽  
Paolo Posocco ◽  
Fabrizio Santoro ◽  
Marco Garavelli ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Excited State ◽  
Gas Phase ◽  
Absorption Spectra ◽  
Potential Energy Surfaces ◽  
Transient Absorption ◽  
Computational Study ◽  
Excited State Absorption ◽  
High Energy ◽  
Electronic Structure Methods

We present a computational study of the one-photon and excited-state absorption from the two lowest-energy excited states of uracil in the gas phase: an n?pi* dark state<br>(1n) and the lowest-energy bright ??? pi-pi* state (1?pi). The predictions of six di?fferent linear response electronic structure methods, namely TD-CAM-B3LYP, EOM-CCSD,<br>EOM-CC3, ADC(2), ADC(2)-x and ADC(3) are critically compared. In general, the spectral shapes predicted by TD-CAM-B3LYP, EOM-CCSD, EOM-CC3 and ADC(3) are fairly similar, though the quality of TD-CAM-B3LYP slightly deteriorates in the high energy region. Computing the spectra at some key structures on the di?fferent potential energy surfaces (PES), i.e. the Franck-Condon point, the 1n minimum,<br>and structures representative of di?fferent regions of the 1? PES, we obtain important insights into the shift of the excited-state absorption spectra, following the motion of the<br>wavepacket on the excited state PES. Though 1pi ? has larger excited-state absorption than 1n, some spectral regions are dominated by these latter signals. Aside from its<br>methodological interest, we thus obtain interesting indications to interpret transient absorption spectra to disentangle the photoactivated dynamics of nucleobases.

scholarly journals Excited State Absorption of Uracil in the Gas Phase: Mapping the Main Decay Paths by Different Electronic Structure Methods

2020 ◽  
Author(s):  
Daniil Fedotov ◽  
Alexander C. Paul ◽  
Paolo Posocco ◽  
Fabrizio Santoro ◽  
Marco Garavelli ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Excited State ◽  
Gas Phase ◽  
Absorption Spectra ◽  
Potential Energy Surfaces ◽  
Transient Absorption ◽  
Computational Study ◽  
Excited State Absorption ◽  
High Energy ◽  
Electronic Structure Methods

We present a computational study of the one-photon and excited-state absorption from the two lowest-energy excited states of uracil in the gas phase: an n?pi* dark state<br>(1n) and the lowest-energy bright ??? pi-pi* state (1?pi). The predictions of six di?fferent linear response electronic structure methods, namely TD-CAM-B3LYP, EOM-CCSD,<br>EOM-CC3, ADC(2), ADC(2)-x and ADC(3) are critically compared. In general, the spectral shapes predicted by TD-CAM-B3LYP, EOM-CCSD, EOM-CC3 and ADC(3) are fairly similar, though the quality of TD-CAM-B3LYP slightly deteriorates in the high energy region. Computing the spectra at some key structures on the di?fferent potential energy surfaces (PES), i.e. the Franck-Condon point, the 1n minimum,<br>and structures representative of di?fferent regions of the 1? PES, we obtain important insights into the shift of the excited-state absorption spectra, following the motion of the<br>wavepacket on the excited state PES. Though 1pi ? has larger excited-state absorption than 1n, some spectral regions are dominated by these latter signals. Aside from its<br>methodological interest, we thus obtain interesting indications to interpret transient absorption spectra to disentangle the photoactivated dynamics of nucleobases.

Competition between the heavy atom effect and vibronic coupling in donor–bridge–acceptor organometallics

2020 ◽  
Vol 22 (8) ◽  
pp. 4659-4667 ◽  
Author(s):  
Julien Eng ◽  
Stuart Thompson ◽  
Heather Goodwin ◽  
Dan Credgington ◽  
Thomas James Penfold
Keyword(s):  
Excited State ◽  
Quantum Dynamics ◽  
Heavy Atom ◽  
Vibronic Coupling ◽  
Intersystem Crossing ◽  
Heavy Atom Effect ◽  
Metal Amides ◽  
Coinage Metals ◽  
Dynamics Simulations ◽  
Atom Effect

The excited state properties and intersystem crossing dynamics of a series of donor–bridge–acceptor carbene metal-amides based upon the coinage metals Cu, Ag, Au, are investigated using quantum dynamics simulations and supported by photophysical characterisation.

scholarly journals Excited-state intramolecular proton transfer to carbon atoms: nonadiabatic surface-hopping dynamics simulations

2015 ◽  
Vol 17 (15) ◽  
pp. 9687-9697 ◽  
Author(s):  
Shu-Hua Xia ◽  
Bin-Bin Xie ◽  
Qiu Fang ◽  
Ganglong Cui ◽  
Walter Thiel
Keyword(s):  
Electronic Structure ◽  
Excited State ◽  
Proton Transfer ◽  
Intramolecular Proton Transfer ◽  
Nonadiabatic Dynamics ◽  
Surface Hopping ◽  
Dynamics Simulations

The combined electronic structure computations and nonadiabatic dynamics simulations show that excited-state intramolecular proton transfer to carbon atoms can be ultrafast.

A theoretical study of the photodynamics of salicylidene-2-anthrylamine in acetonitrile solution

2018 ◽  
Vol 20 (46) ◽  
pp. 29399-29411 ◽  
Author(s):  
Wilver A. Muriel ◽  
Juan F. Botero-Cadavid ◽  
Carlos Cárdenas ◽  
William Rodríguez-Córdoba
Keyword(s):  
Molecular Dynamics ◽  
Electronic Structure ◽  
Excited State ◽  
Theoretical Study ◽  
Electronic Structure Calculations ◽  
Acetonitrile Solution ◽  
Td Dft ◽  
Dynamics Simulations ◽  
Structure Calculations ◽  
Photoinduced Processes

The ultrafast photoinduced processes of salicylidene-2-anthrylamine (2-AntSA) in acetonitrile solution have been investigated using DFT/TD-DFT static electronic structure calculations and excited state ab initio molecular dynamics simulations.

scholarly journals Excited-State Electronic Structure of Molecules Using Many-Body Green's Functions: Quasiparticles and Electron-Hole Excitations with VOTCA-XTP

2019 ◽  
Author(s):  
Gianluca Tirimbò ◽  
Vivek Sundaram ◽  
Onur Çaylak ◽  
Wouter Scharpach ◽  
Javier Sijen ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Excited State ◽  
Excited States ◽  
Green's Functions ◽  
Green’S Functions ◽  
Molecular Architecture ◽  
Many Body ◽  
Electron Hole ◽  
Structure Of Molecules ◽  
Dynamics Simulations

<div>We present the open-source VOTCA-XTP software for the calculation of the excited-state electronic structure of molecules using many-body Green’s functions theory in the GW approximation with the Bethe–Salpeter Equation (BSE). This work provides a summary of the underlying theory and discusses details of its implementation based on Gaussian orbitals, including, i.a., resolution-of-identity techniques, different approaches to the frequency integration of the self-energy or acceleration by offloading compute-intensive matrix operations using GPUs in a hybrid OpenMP/Cuda scheme. A distinctive feature of VOTCA-XTP is the capability to couple the calculation of electronic excitations to a classical polarizable environment on atomistic level in a coupled quantum- and molecular-mechanics (QM/MM) scheme, where a complex morphology can be imported from Molecular Dynamics simulations. The capabilities and limitations of the GW -BSE implementation are illustrated with two examples. First, we study the dependence of optically active electron-hole excitations in a series of diketopyrrolopyrrole-based oligomers on molecular-architecture modifications and the number of repeat units. Second, we use the GW -BSE/MM setup to investigate the effect of polarization on localized and intermolecular charge-transfer excited states in morphologies of low-donor content rubrene-fullerene mixtures. These showcases demonstrate that our implementation currently allows to treat systems with up to 2500 basis functions on regular shared-memory workstations, providing accurate descriptions of quasiparticle and coupled electron-hole excited states of various character on an equal footing.</div>

Excited-state proton transfer in 4-2′-hydroxyphneylpyridine: full-dimensional surface-hopping dynamics simulations

RSC Advances ◽  
2016 ◽  
Vol 6 (88) ◽  
pp. 85574-85581 ◽  
Author(s):  
Wei-Wei Guo ◽  
Xiang-Yang Liu ◽  
Wen-Kai Chen ◽  
Ganglong Cui
Keyword(s):  
Electronic Structure ◽  
Excited State ◽  
Proton Transfer ◽  
Electronic Structure Calculations ◽  
Intramolecular Proton Transfer ◽  
Surface Hopping ◽  
Excited State Proton Transfer ◽  
Dynamics Simulations ◽  
Structure Calculations ◽  
Dimensional Surface

We have employed combined electronic structure calculations and “on-the-fly” fewest switches surface-hopping dynamics simulations to study the S1 excited-state intramolecular proton transfer (ESIPT) and decay dynamics of 4-(2′-hydroxyphenyl)pyridine.

scholarly journals Accelerating direct quantum dynamics using graphical processing units

2017 ◽  
Vol 19 (30) ◽  
pp. 19601-19608 ◽  
Author(s):  
T. J. Penfold
Keyword(s):  
Electronic Structure ◽  
Excited State ◽  
Quantum Dynamics ◽  
Electronic Structure Calculations ◽  
Gpu Acceleration ◽  
Direct Dynamics ◽  
Graphical Processing Units ◽  
Graphical Processing ◽  
Structure Calculations

The direct dynamics variational multi-configurational Gaussian (DD-vMCG) method is combined with electronic structure calculations accelerated by Graphical Processing Units (GPUs). This is used to identify GPU acceleration will have a significant effect for both ground and excited state simulations.

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