Electronic Relaxation and Dissociation Dynamics in Formaldehyde: Pump Wavelength Dependence

2021 ◽  
Author(s):  
Tomoyuki Endo ◽  
Simon Neville ◽  
Philippe Lassonde ◽  
Chen Qu ◽  
Hikaru Fujise ◽  
...  
Keyword(s):  
Excited State ◽  
First Principles ◽  
Wavelength Dependence ◽  
Pump Wavelength ◽  
Electronic Relaxation ◽  
Excited State Dynamics ◽  
Dissociation Dynamics

The effect of the incident UV pump wavelength on the subsequent excited state dynamics, elec- tronic relaxation, and ultimate dissociation of formaldehyde is studied using first principles simu- lation and...

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>

Excited state dynamics in pyrrole–water clusters: First-principles simulation

2008 ◽  
Vol 343 (2-3) ◽  
pp. 347-352 ◽  
Author(s):  
Irmgard Frank ◽  
Konstantina Damianos
Keyword(s):  
Excited State ◽  
First Principles ◽  
Water Clusters ◽  
Excited State Dynamics

Time-resolved photoelectron spectroscopy from first principles: Excited state dynamics of benzene

2011 ◽  
Vol 150 ◽  
pp. 293 ◽  
Author(s):  
Alexis L. Thompson ◽  
Todd J. Martínez
Keyword(s):  
Excited State ◽  
First Principles ◽  
Photoelectron Spectroscopy ◽  
Time Resolved ◽  
Excited State Dynamics

Kinetics model for the wavelength-dependence of excited-state dynamics of hetero-FRET sensors

2017 ◽  
Author(s):  
Ahmed A. Heikal ◽  
Jacob Schwarz ◽  
Ryan Leighton ◽  
Hannah Leopold ◽  
Megan Currie ◽  
...  
Keyword(s):  
Excited State ◽  
Wavelength Dependence ◽  
Kinetics Model ◽  
Excited State Dynamics

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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