Simultaneous Determination of Spectral Signatures and Decay Kinetics of Excited State Species in Semiconductor Nanocrystals Probed by Transient Absorption Spectroscopy

2020 ◽  
Vol 124 (15) ◽  
pp. 8439-8447 ◽  
Author(s):  
Tais Labrador ◽  
Gordana Dukovic
Keyword(s):  
Excited State ◽  
Simultaneous Determination ◽  
Absorption Spectroscopy ◽  
Transient Absorption ◽  
Semiconductor Nanocrystals ◽  
Transient Absorption Spectroscopy ◽  
Decay Kinetics ◽  
Spectral Signatures ◽  
Kinetics Of

scholarly journals Tracking excited state decay mechanisms of pyrimidine nucleosides in real time

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Rocío Borrego-Varillas ◽  
Artur Nenov ◽  
Piotr Kabaciński ◽  
Irene Conti ◽  
Lucia Ganzer ◽  
...  
Keyword(s):  
Excited State ◽  
Transient Absorption ◽  
Building Blocks ◽  
Transient Absorption Spectroscopy ◽  
Classical Dynamics ◽  
Spectral Signatures ◽  
Spectral Signal ◽  
Order Of Magnitude ◽  
Franck Condon ◽  
Intense Debate

AbstractDNA owes its remarkable photostability to its building blocks—the nucleosides—that efficiently dissipate the energy acquired upon ultraviolet light absorption. The mechanism occurring on a sub-picosecond time scale has been a matter of intense debate. Here we combine sub-30-fs transient absorption spectroscopy experiments with broad spectral coverage and state-of-the-art mixed quantum-classical dynamics with spectral signal simulations to resolve the early steps of the deactivation mechanisms of uridine (Urd) and 5-methyluridine (5mUrd) in aqueous solution. We track the wave packet motion from the Franck-Condon region to the conical intersections (CIs) with the ground state and observe spectral signatures of excited-state vibrational modes. 5mUrd exhibits an order of magnitude longer lifetime with respect to Urd due to the solvent reorganization needed to facilitate bulky methyl group motions leading to the CI. This activates potentially lesion-inducing dynamics such as ring opening. Involvement of the 1nπ* state is found to be negligible.

Photoinduced ligand dissociation follows reverse energy gap law: nitrile photodissociation from low energy 3MLCT excited states

2020 ◽  
Vol 56 (29) ◽  
pp. 4070-4073
Author(s):  
Lauren M. Loftus ◽  
Jeffrey J. Rack ◽  
Claudia Turro
Keyword(s):  
Excited State ◽  
Excited States ◽  
Absorption Spectroscopy ◽  
Transient Absorption ◽  
Energy Gap ◽  
Low Energy ◽  
Transient Absorption Spectroscopy ◽  
Ligand Dissociation ◽  
Energy Gap Law

Transient absorption spectroscopy is used to show that stabilization of the 3MLCT excited state in a series of Ru(ii) complexes leads to decreased population of the 3LF state, but does not reduce the efficiency of photoinduced nitrile dissociation.

Triplet Excited State Distortions in a Pyrazolate Bridged Platinum Dimer Measured by X-ray Transient Absorption Spectroscopy

2010 ◽  
Vol 114 (48) ◽  
pp. 12780-12787 ◽  
Author(s):  
Jenny V. Lockard ◽  
Aaron A. Rachford ◽  
Grigory Smolentsev ◽  
Andrew B. Stickrath ◽  
Xianghuai Wang ◽  
...  
Keyword(s):  
Excited State ◽  
Absorption Spectroscopy ◽  
Transient Absorption ◽  
Transient Absorption Spectroscopy ◽  
Triplet Excited State ◽  
X Ray

Effect of Aggregation on the Excited-State Electronic Structure of Perylene Studied by Transient Absorption Spectroscopy

2006 ◽  
Vol 110 (20) ◽  
pp. 6465-6471 ◽  
Author(s):  
Akihiro Furube ◽  
Miki Murai ◽  
Yoshiaki Tamaki ◽  
Sadayuki Watanabe ◽  
Ryuzi Katoh
Keyword(s):  
Electronic Structure ◽  
Excited State ◽  
Absorption Spectroscopy ◽  
Transient Absorption ◽  
Transient Absorption Spectroscopy
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