Electronic excited‐state dynamics in the transient grating signal: Absolute quantum yields of fluorescence and triplet formation

1993 ◽  
Vol 73 (11) ◽  
pp. 7672-7676 ◽  
Author(s):  
Masahide Terazima ◽  
Noboru Hirota
Keyword(s):  
Excited State ◽  
Quantum Yields ◽  
Transient Grating ◽  
Excited State Dynamics ◽  
Electronic Excited State ◽  
Triplet Formation ◽  
Absolute Quantum

Revisiting the spectroscopy of xanthine derivatives: theobromine and theophylline

2019 ◽  
Vol 21 (48) ◽  
pp. 26430-26437 ◽  
Author(s):  
Ander Camiruaga ◽  
Imanol Usabiaga ◽  
Viola C. D’mello ◽  
Gustavo A. García ◽  
Sanjay Wategaonkar ◽  
...  
Keyword(s):  
Excited State ◽  
Excited State Dynamics ◽  
Electronic Excited State ◽  
Xanthine Derivatives

Methylation deeply influences the electronic excited state dynamics of xanthines.

scholarly journals On the origin of spatially dependent electronic excited-state dynamics in mixed hybrid perovskite thin films

2019 ◽  
Vol 58 (4) ◽  
Author(s):  
Ying-Zhong Ma ◽  
Benjamin Doughty ◽  
Mary Jane Simpson ◽  
Sanjib Das ◽  
Kai Xiao
Keyword(s):  
Thin Films ◽  
Excited State ◽  
Transient Absorption ◽  
Signal Amplitude ◽  
Spatial Location ◽  
Optoelectronic Device ◽  
Dynamical Process ◽  
Spectroscopic Techniques ◽  
Excited State Dynamics ◽  
Electronic Excited State

The fundamental photophysics underlying the remarkable performance of organic-inorganic hybrid perovskites in optoelectronic device applications has been increasingly studied using complementary spectroscopic techniques. However, the spatially heterogeneous polycrystalline morphology of the solution-processed thin films is often overlooked in conventional ensemble measurements and therefore the reported results are averaged over hundreds or even thousands of nano- and micro-crystalline grains. Here, we apply femtosecond transient absorption microscopy to spatially and temporally probe ultrafast electronic excited-state dynamics in chloride containing mixed lead halide perovskite (CH3NH3PbI3–xClx) thin films. We found that the electronic excited-state relaxation kinetics are extremely sensitive to the spatial location probed, which was manifested by position-dependent transient absorption signal amplitude and decay behaviour, along with an obvious rise component at some positions. The analysis of transient absorption kinetics acquired at several distinct spatial positions enabled us to identify Auger recombination as the dominant mechanism underlying the initial portions of the spatially dependent dynamics with variable rate constants. The different rates observed suggest occurrence of distinct local electronic structures and variable contributions from impurities/defects and phonons in this nonlinear dynamical process.

scholarly journals An excited state dynamics driven reaction: wavelength-dependent photoisomerization quantum yields in [Ru(bpy)2(dmso)2]2+

2020 ◽  
Vol 11 (22) ◽  
pp. 5797-5807
Author(s):  
Maksim Y. Livshits ◽  
Lei Wang ◽  
Sebastian B. Vittardi ◽  
Stefan Ruetzel ◽  
Albert King ◽  
...  
Keyword(s):  
Excited State ◽  
Quantum Yields ◽  
State Behavior ◽  
Pump Probe ◽  
Excited State Dynamics ◽  
Probe Spectroscopy

We report the excited-state behavior of a simple bis-sulfoxide complex, cis-S,S-[Ru(bpy)2(dmso)2]2+, as investigated by femtosecond pump–probe spectroscopy.

scholarly journals Methods to Calculate Electronic Excited-state Dynamics For Molecules on Large Metal Clusters with Many States: Ensuring Fast Overlap Calculations and a Robust Choice of Phase

2021 ◽  
Author(s):  
Hsing-Ta Chen ◽  
Junhan Chen ◽  
Vale Cofer-Shabica ◽  
Zeyu Zhou ◽  
Vishikh Athavale ◽  
...  
Keyword(s):  
Excited State ◽  
Collective Excitation ◽  
Metal Cluster ◽  
Computational Cost ◽  
Electronic States ◽  
Relaxation Processes ◽  
Nuclear Dynamics ◽  
Excited State Dynamics ◽  
Electronic Excited State ◽  
Unified Protocol

We present an efficient set of methods for propagating excited-state dynamics involving a large number of electronic states based on a CIS electronic state overlap scheme. Specifically, (i) following Head-Gordon et al, we implement an exact evaluation of the overlap of singly-excited electronic states at different nuclear geometries using a biorthogonal basis, and (ii) we employ a unified protocol for choosing the correct phase for each adiabat at each geometry. For many-electron systems, the combination of these techniques significantly reduces the computational cost of integrating the electronic Schrodinger equation and imposes minimal overhead on top of the underlying electronic structure calculation. As a demonstration, we calculate the electronic excited-state dynamics for a hydrogen molecule scattering off a silver metal cluster, focusing on high-lying excited states where many electrons can be excited collectively and crossings are plentiful. Interestingly, we find that the high-lying, plasmon-like collective excitation spectrum changes with nuclear dynamics, highlighting the need to simulate non-adiabatic nuclear dynamics and plasmonic excitations simultaneously. In the future, the combination of methods presented here should help theorists build a mechanistic understanding of plasmon-assisted charge transfer and excitation energy relaxation processes near a nanoparticle or metal surface.

Excited-state dynamics and efficient triplet formation in phenylthiophene compounds

2012 ◽  
Vol 14 (18) ◽  
pp. 6211 ◽  
Author(s):  
Igor L. Zheldakov ◽  
Jenna M. Wasylenko ◽  
Christopher G. Elles
Keyword(s):  
Excited State ◽  
Excited State Dynamics ◽  
Triplet Formation
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