Electronic relaxation pathways of the biologically relevant pterin chromophore

2017 ◽  
Vol 19 (20) ◽  
pp. 12720-12729 ◽  
Author(s):  
R. M. DiScipio ◽  
R. Y. Santiago ◽  
D. Taylor ◽  
C. E. Crespo-Hernández
Keyword(s):  
Absorption Spectroscopy ◽  
Transient Absorption ◽  
Relaxation Mechanism ◽  
Transient Absorption Spectroscopy ◽  
Electronic Relaxation ◽  
Biologically Relevant ◽  
Ultrafast Relaxation ◽  
First Time

Femtosecond-to-microsecond transient absorption spectroscopy is used to report the ultrafast relaxation mechanism of 2-amino-1H-pteridin-4-one (pterin) for the first time.

Unveiling the dimension-dependence of femtosecond nonlinear optical properties of tellurium nanostructures

2021 ◽  
Author(s):  
Qi Xiao ◽  
Bo Ma ◽  
Xian Fei ◽  
Duan-Wu Liu ◽  
Xin-Ping Zhai ◽  
...  
Keyword(s):  
Optical Properties ◽  
Absorption Spectroscopy ◽  
Nonlinear Optical ◽  
Transient Absorption ◽  
Nonlinear Optical Properties ◽  
Transient Absorption Spectroscopy ◽  
Exciton Dynamics ◽  
Ultrafast Transient Absorption ◽  
First Time ◽  
Ultrafast Transient Absorption Spectroscopy

For the first time, strong dimension-dependent femtosecond nonlinear optical properties were demonstrated in a variety of Te nanostructures. Ultrafast transient absorption spectroscopy revealed the dimension-dependent exciton dynamics.

Cascading electron and hole transfer dynamics in a CdS/CdTe core–shell sensitized with bromo-pyrogallol red (Br-PGR): slow charge recombination in type II regime

Nanoscale ◽  
2015 ◽  
Vol 7 (6) ◽  
pp. 2698-2707 ◽  
Author(s):  
Partha Maity ◽  
Tushar Debnath ◽  
Uday Chopra ◽  
Hirendra Nath Ghosh
Keyword(s):  
Electron Transfer ◽  
Absorption Spectroscopy ◽  
Transient Absorption ◽  
Charge Recombination ◽  
Transient Absorption Spectroscopy ◽  
Core Shell ◽  
Type Ii ◽  
Pyrogallol Red ◽  
First Time ◽  
Cdte Core

For the first time ultrafast cascading hole and electron transfer dynamics in a CdS/CdTe type II core–shell sensitized with a molecular adsorbate (Br-PGR) have been demonstrated using transient absorption spectroscopy.

Electronic relaxation dynamics of PCDA-PDA studied by transient absorption spectroscopy

2016 ◽  
Vol 18 (33) ◽  
pp. 23096-23104 ◽  
Author(s):  
Joonyoung F. Joung ◽  
Junwoo Baek ◽  
Youngseo Kim ◽  
Songyi Lee ◽  
Myung Hwa Kim ◽  
...  
Keyword(s):  
Absorption Spectroscopy ◽  
Transient Absorption ◽  
Transient Absorption Spectroscopy ◽  
Electronic Relaxation ◽  
Relaxation Dynamics ◽  
Femtosecond Transient Absorption ◽  
Femtosecond Transient Absorption Spectroscopy ◽  
Thermochromic Properties

Spectroscopic signature of thermochromic properties of PCDA-PDA is revealed by femtosecond transient absorption spectroscopy.

scholarly journals Photo-induced dynamics of the heme centers in cytochrome bc1

2015 ◽  
Vol 17 (3) ◽  
pp. 2143-2151 ◽  
Author(s):  
Adrien A. P. Chauvet ◽  
André Al Haddad ◽  
Wei-Chun Kao ◽  
Frank van Mourik ◽  
Carola Hunte ◽  
...  
Keyword(s):  
Absorption Spectroscopy ◽  
Transient Absorption ◽  
Transient Absorption Spectroscopy ◽  
Cytochrome Bc1 ◽  
First Time

The ultrafast response of cytochromebc1is investigated for the first time,viatransient absorption spectroscopy.

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>

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