Ultrafast Excited State Dynamics of 5,6-Dihydroxyindole, A Key Eumelanin Building Block: Nonradiative Decay Mechanism

2009 ◽  
Vol 113 (37) ◽  
pp. 12575-12580 ◽  
Author(s):  
Magdalena Gauden ◽  
Alessandro Pezzella ◽  
Lucia Panzella ◽  
Alessandra Napolitano ◽  
Marco d’Ischia ◽  
...  
Keyword(s):  
Excited State ◽  
Building Block ◽  
Decay Mechanism ◽  
Nonradiative Decay ◽  
Excited State Dynamics

Ultrafast Excited-State Dynamics and Photolysis in Base-Off B12Coenzymes and Analogues: Absence of the trans-Nitrogenous Ligand Opens a Channel for Rapid Nonradiative Decay

2010 ◽  
Vol 114 (38) ◽  
pp. 12398-12405 ◽  
Author(s):  
Jian Peng ◽  
Kuo-Chun Tang ◽  
Kaitlin McLoughlin ◽  
Yang Yang ◽  
Danika Forgach ◽  
...  
Keyword(s):  
Excited State ◽  
Nonradiative Decay ◽  
Excited State Dynamics

scholarly journals Ultrafast excited state dynamics of nonfluorescent cyclopheophorbide-aenol, a catabolite of chlorophyll-adetoxified in algae-feeding aquatic microbes

2019 ◽  
Vol 18 (1) ◽  
pp. 64-70 ◽  
Author(s):  
Chikashi Ota ◽  
Keita Sugihara ◽  
Yusuke Kinoshita ◽  
Yuichiro Kashiyama ◽  
Yutaka Nagasawa ◽  
...  
Keyword(s):  
Excited State ◽  
Absorption Spectroscopy ◽  
Intermediate State ◽  
Transient Absorption ◽  
Transient Absorption Spectroscopy ◽  
Nonradiative Decay ◽  
Excited State Dynamics ◽  
Aquatic Microbes

Transient absorption spectroscopy revealed that a catabolite of chlorophyll-a, cPPB-aE, undergoes ultrafast nonradiative decay through an intermediate state.

Excited-State Dynamics in the RNA Nucleotide Uridine 5’-Monophosphate Investigated by Femtosecond Broadband Transient Absorption Spectroscopy

2019 ◽  
Author(s):  
Matthew M. Brister ◽  
Carlos Crespo-Hernández
Keyword(s):  
Excited State ◽  
Excited States ◽  
Ground State ◽  
Transient Absorption ◽  
Electronic Energy ◽  
Transient Absorption Spectroscopy ◽  
Electronic Relaxation ◽  
Vibrationally Excited ◽  
Excited State Dynamics ◽  
Π State

<p></p><p> Damage to RNA from ultraviolet radiation induce chemical modifications to the nucleobases. Unraveling the excited states involved in these reactions is essential, but investigations aimed at understanding the electronic-energy relaxation pathways of the RNA nucleotide uridine 5’-monophosphate (UMP) have not received enough attention. In this Letter, the excited-state dynamics of UMP is investigated in aqueous solution. Excitation at 267 nm results in a trifurcation event that leads to the simultaneous population of the vibrationally-excited ground state, a longlived <sup>1</sup>n<sub>O</sub>π* state, and a receiver triplet state within 200 fs. The receiver state internally convert to the long-lived <sup>3</sup>ππ* state in an ultrafast time scale. The results elucidate the electronic relaxation pathways and clarify earlier transient absorption experiments performed for uracil derivatives in solution. This mechanistic information is important because long-lived nπ* and ππ* excited states of both singlet and triplet multiplicities are thought to lead to the formation of harmful photoproducts.</p><p></p>

Modulation of Excited State Dynamics in Lead Halide Perovskite Films with Electrical Bias

2019 ◽  
Author(s):  
Gergely Samu ◽  
R.A. Scheidt ◽  
A. Balog ◽  
C. Janáky ◽  
P.V. Kamat
Keyword(s):  
Excited State ◽  
Excited State Dynamics ◽  
Halide Perovskite ◽  
Electrical Bias ◽  
Lead Halide
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