Time-Resolved Vibrational Analysis of Excited State Ab Initio Molecular Dynamics to Understand Photorelaxation: The Case of the Pyranine Photoacid in Aqueous Solution
Maria Gabriella Chiariello, Greta Donati, Nadia Rega
Abstract
We present a novel time-resolved vibrational analysis for studying photoinduced nuclear relaxation. Generalized modes velocities are defined from ab initio molecular dynamics and wavelet transformed, providing the time localization of vibrational signals in the electronic excited state. The photoexcited pyranine in aqueous solution is presented as a case study. The transient and sequential activation of the simulated vibrational signals is in good agreement with vibrational dynamics obtained from femtosecond stimulated Raman spectroscopy data.
Topics & Concepts
PyranineExcited stateVibrational energy relaxationAb initioRelaxation (psychology)Raman spectroscopyFemtosecondAqueous solutionChemistryMolecular physicsSpectroscopyAb initio quantum chemistry methodsUltrafast laser spectroscopyMolecular vibrationChemical physicsComputational chemistryAtomic physicsMoleculePhysical chemistryLaserPhysicsOpticsQuantum mechanicsBiochemistryOrganic chemistryMembranePsychologySocial psychologySpectroscopy and Quantum Chemical StudiesPhotochemistry and Electron Transfer StudiesMolecular spectroscopy and chirality