A Near-Infrared Transient Absorption Study of the Excited-State Dynamics of the Carotenoid Spirilloxanthin in Solution and in the LH1 Complex ofRhodospirillum rubrum

2003 ◽  
Vol 107 (40) ◽  
pp. 11216-11223 ◽  
Author(s):  
Emmanouil Papagiannakis ◽  
Ivo H. M. van Stokkum ◽  
Rienk van Grondelle ◽  
Robert A. Niederman ◽  
Donatas Zigmantas ◽  
...  
Keyword(s):  
Excited State ◽  
Near Infrared ◽  
Transient Absorption ◽  
Absorption Study ◽  
Excited State Dynamics

Excited-state dynamics of heteroleptic copper(i) photosensitizers and their electrochemically reduced forms containing a dipyridophenazine moiety – a spectroelectrochemical transient absorption study

2019 ◽  
Vol 21 (20) ◽  
pp. 10716-10725
Author(s):  
Ying Zhang ◽  
Linda Zedler ◽  
Michael Karnahl ◽  
Benjamin Dietzek
Keyword(s):  
Excited State ◽  
Transient Absorption ◽  
Absorption Study ◽  
Excited State Dynamics ◽  
Reduced Forms

Heteroleptic copper(i) dipyridophenazine complexes were investigated by transient absorption spectroelectrochemistry to examine their multi-electron photoaccumulation properties.

Ultrafast Excited-State Dynamics of Ligand-Field and Ligand-to-Metal Charge-Transfer States of CuCl42– in Solution: A Detailed Transient Absorption Study

2018 ◽  
Vol 122 (46) ◽  
pp. 10558-10571 ◽  
Author(s):  
Andrey S. Mereshchenko ◽  
Olesya S. Myasnikova ◽  
Pavel K. Olshin ◽  
Sergey M. Matveev ◽  
Maxim S. Panov ◽  
...  
Keyword(s):  
Excited State ◽  
Charge Transfer ◽  
Transient Absorption ◽  
Ligand Field ◽  
Absorption Study ◽  
Metal Charge ◽  
Excited State Dynamics ◽  
Metal Charge Transfer

A combined experimental and theoretical investigation on the excited state dynamics of 2,4,6-trinitrotoluene (TNT) in DMSO solvent

2021 ◽  
Author(s):  
Runze Liu ◽  
Fangjian Shang ◽  
Ying Xiong ◽  
Chaoyang Zhang ◽  
Songqiu Yang ◽  
...  
Keyword(s):  
Excited State ◽  
Theoretical Investigation ◽  
Transient Absorption ◽  
Absorption Study ◽  
Present Contribution ◽  
Excited State Dynamics ◽  
Vertical Excitation ◽  
Femtosecond Transient Absorption

In the present contribution we carried out TDDFT and femtosecond transient absorption study for the excited state dynamics of TNT in DMSO solvent. Vertical excitation and excited state relaxation were...

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 relaxation paths in 9,9′-bianthryl and 9-carbazolyl-anthracene: a sub-ps transient absorption study

2000 ◽  
Vol 253 (2-3) ◽  
pp. 339-349 ◽  
Author(s):  
Martin Jurczok ◽  
Pascal Plaza ◽  
Monique M Martin ◽  
Yves H Meyer ◽  
Wolfgang Rettig
Keyword(s):  
Excited State ◽  
Transient Absorption ◽  
Absorption Study

scholarly journals Photoexcitation of Ge9− Clusters in THF: New Insights into the Ultrafast Relaxation Dynamics and the Influence of the Cation

Molecules ◽  
2020 ◽  
Vol 25 (11) ◽  
pp. 2639
Author(s):  
Nadine C. Michenfelder ◽  
Christian Gienger ◽  
Melina Dilanas ◽  
Andreas Schnepf ◽  
Andreas-Neil Unterreiner
Keyword(s):  
Excited State ◽  
Charge Transfer ◽  
Conduction Band ◽  
Near Infrared ◽  
Transient Absorption ◽  
Time Window ◽  
Excess Electron ◽  
Cluster Core ◽  
Relaxation Dynamics ◽  
Additional Time

We present a comprehensive femtosecond (fs) transient absorption study of the [Ge9(Hyp)3]− (Hyp = Si(SiMe3)3) cluster solvated in tetrahydrofuran (THF) with special emphasis on intra- and intermolecular charge transfer mechanisms which can be tuned by exchange of the counterion and by dimerization of the cluster. The examination of the visible and the near infrared (NIR) spectral range reveals four different processes of cluster dynamics after UV (267/258 nm) photoexcitation related to charge transfer to solvent and localized excited states in the cluster. The resulting transient absorption is mainly observed in the NIR region. In the UV-Vis range transient absorption of the (neutral) cluster core with similar dynamics can be observed. By transferring concepts of: (i) charge transfer to the solvent known from solvated Na− in THF and (ii) charge transfer in bulk-like materials on metalloid cluster systems containing [Ge9(Hyp)3]− moieties, we can nicely interpret the experimental findings for the different compounds. The first process occurs on a fs timescale and is attributed to localization of the excited electron in the quasi-conduction band/excited state which competes with a charge transfer to the solvent. The latter leads to an excess electron initially located in the vicinity of the parent cluster within the same solvent shell. In a second step, it can recombine with the cluster core with time constants in the picosecond (ps) timescale. Some electrons can escape the influence of the cluster leading to a solvated electron or after interaction with a cation to a contact pair both with lifetimes exceeding our experimentally accessible time window of 1 nanosecond (ns). An additional time constant on a tens of ps timescale is pronounced in the UV-Vis range which can be attributed to the recombination rate of the excited state or quasi conduction band of Ge9−. In the dimer, the excess electron cannot escape the molecule due to strong trapping by the Zn cation that links the two cluster cores.

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