Vibrationally resolved optical spectra and ultrafast electronic relaxation dynamics of diamantane

2016 ◽  
Vol 18 (12) ◽  
pp. 8701-8709 ◽  
Author(s):  
Merle I. S. Röhr ◽  
Roland Mitrić ◽  
Jens Petersen
Keyword(s):  
Excited State ◽  
Laser Excitation ◽  
Optical Spectra ◽  
Relaxation Processes ◽  
Electronic Relaxation ◽  
Relaxation Dynamics

Even after laser excitation to high-lying bright states, diamantane fluoresces from the lowest excited state due to ultrafast nonadiabatic relaxation processes.

Optical spectra and excited state relaxation dynamics of Nd3+ in CaF2 single crystal

2011 ◽  
Vol 509 (36) ◽  
pp. 8880-8884 ◽  
Author(s):  
Qingguo Wang ◽  
Liangbi Su ◽  
Hongjun Li ◽  
Lihe Zheng ◽  
Xin Guo ◽  
...  
Keyword(s):  
Excited State ◽  
Single Crystal ◽  
Optical Spectra ◽  
Relaxation Dynamics ◽  
Caf2 Single Crystal

scholarly journals Optical spectra and excited state relaxation dynamics of Sm3+ in Gd2SiO5 single crystal

2011 ◽  
Vol 106 (1) ◽  
pp. 85-93 ◽  
Author(s):  
A. Strzęp ◽  
R. Lisiecki ◽  
P. Solarz ◽  
G. Dominiak-Dzik ◽  
W. Ryba-Romanowski ◽  
...  
Keyword(s):  
Excited State ◽  
Single Crystal ◽  
Optical Spectra ◽  
Relaxation Dynamics

Electronic relaxation dynamics in [Au25(SR)18]−1 (R = CH3, C2H5, C3H7, MPA, PET) thiolate-protected nanoclusters

2020 ◽  
Vol 22 (9) ◽  
pp. 5272-5285
Author(s):  
Ravithree D. Senanayake ◽  
Christine M. Aikens
Keyword(s):  
Excited State ◽  
Gold Nanoclusters ◽  
Electronic Relaxation ◽  
Relaxation Dynamics ◽  
State Decay ◽  
Decay Times

Excited state decay times in thiolate-stabilized gold nanoclusters exhibit a degree of dependence on the passivating ligand.

Optical spectra and excited state relaxation dynamics of Sm 2+ ions in SrCl 2 , SrBr 2 and SrI 2 crystals

2018 ◽  
Vol 195 ◽  
pp. 159-165 ◽  
Author(s):  
Mirosław Karbowiak ◽  
Piotr Solarz ◽  
Radosław Lisiecki ◽  
Witold Ryba-Romanowski
Keyword(s):  
Excited State ◽  
Optical Spectra ◽  
Relaxation 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>

scholarly journals Ultrafast excited state dynamics and light-switching of [Ru(phen)2(dppz)]2+ in G-quadruplex DNA

2021 ◽  
Vol 4 (1) ◽  
Author(s):  
Chunfan Yang ◽  
Qian Zhou ◽  
Zeqing Jiao ◽  
Hongmei Zhao ◽  
Chun-Hua Huang ◽  
...  
Keyword(s):  
Excited State ◽  
State Formation ◽  
Rational Design ◽  
Bound Water ◽  
Binding Modes ◽  
Relaxation Dynamics ◽  
Dark State ◽  
Excited State Dynamics ◽  
G Quadruplex ◽  
Mechanistic Basis

AbstractThe triplet metal to ligand charge transfer (3MLCT) luminescence of ruthenium (II) polypyridyl complexes offers attractive imaging properties, specifically towards the development of sensitive and structure-specific DNA probes. However, rapidly-deactivating dark state formation may compete with 3MLCT luminescence depending on different DNA structures. In this work, by combining femtosecond and nanosecond pump-probe spectroscopy, the 3MLCT relaxation dynamics of [Ru(phen)2(dppz)]2+ (phen = 1,10-phenanthroline, dppz = dipyridophenazine) in two iconic G-quadruplexes has been scrutinized. The binding modes of stacking of dppz ligand on the terminal G-quartet fully and partially are clearly identified based on the biexponential decay dynamics of the 3MLCT luminescence at 620 nm. Interestingly, the inhibited dark state channel in ds-DNA is open in G-quadruplex, featuring an ultrafast picosecond depopulation process from 3MLCT to a dark state. The dark state formation rates are found to be sensitive to the content of water molecules in local G-quadruplex structures, indicating different patterns of bound water. The unique excited state dynamics of [Ru(phen)2(dppz)]2+ in G-quadruplex is deciphered, providing mechanistic basis for the rational design of photoactive ruthenium metal complexes in biological applications.

Femtosecond UV Studies of the Electronic Relaxation Processes in Cytochromec

2011 ◽  
Vol 115 (46) ◽  
pp. 13723-13730 ◽  
Author(s):  
Olivier Bräm ◽  
Cristina Consani ◽  
Andrea Cannizzo ◽  
Majed Chergui
Keyword(s):  
Relaxation Processes ◽  
Electronic Relaxation

Excited state relaxation dynamics and up-conversion phenomena in Gd 3 (Al,Ga) 5 O 12 single crystals co-doped with holmium and ytterbium

2016 ◽  
Vol 656 ◽  
pp. 573-580 ◽  
Author(s):  
W. Ryba-Romanowski ◽  
J. Komar ◽  
T. Niedźwiedzki ◽  
M. Głowacki ◽  
M. Berkowski
Keyword(s):  
Excited State ◽  
Single Crystals ◽  
Relaxation Dynamics ◽  
Co Doped
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