scholarly journals Charge-transfer-to-solvent reactions from I− to water, methanol, and ethanol studied by time-resolved photoelectron spectroscopy of liquids

2016 ◽  
Vol 145 (7) ◽  
pp. 074502 ◽  
Author(s):  
Haruki Okuyama ◽  
Yoshi-Ichi Suzuki ◽  
Shutaro Karashima ◽  
Toshinori Suzuki
Keyword(s):  
Charge Transfer ◽  
Photoelectron Spectroscopy ◽  
Time Resolved

scholarly journals Real-time probing of charge-transfer induced interfacial fields in a dye-semiconductor system using time-resolved XPS

2019 ◽  
Vol 205 ◽  
pp. 05021
Author(s):  
Johannes Mahl ◽  
Stefan Neppl ◽  
Friedrich Roth ◽  
Andrey Shavorskiy ◽  
Nils Huse ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Charge Carrier ◽  
Photoelectron Spectroscopy ◽  
Carrier Dynamics ◽  
Time Resolved ◽  
X Ray ◽  
Charge Carrier Dynamics ◽  
Semiconductor System ◽  
Induced Charge ◽  
Polypyridine Complexes

Photo-induced charge carrier dynamics and transient interfacial fields at the interface between N3 polypyridine complexes and films of nanocrystalline ZnO are probed by picosecond time-resolved X-ray photoelectron spectroscopy.

scholarly journals Oxygen Vacancy-Mediated Interfacial Charge Transfer of Au/ZnO Schottky Heterojunctions for Enhanced UV Photodegradation

2020 ◽  
Vol 2020 ◽  
pp. 1-17
Author(s):  
Zhufeng Shao ◽  
Hui Jia ◽  
Yufeng Zhang ◽  
Xiujuan Yang ◽  
Min Zhong ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Photoelectron Spectroscopy ◽  
Uv Light ◽  
Light Irradiation ◽  
Interesting Phenomenon ◽  
Local Surface Plasmon Resonance ◽  
Interfacial Charge Transfer ◽  
Time Resolved ◽  
Pl Spectra ◽  
Interfacial Charge

We intend to report an interesting phenomenon related to the different interfacial transfer processes between ellipsoidal-like ZnO (E-ZnO) and rod-like ZnO (R-ZnO) nanoheterojunctions witness by the nanosecond time-resolved transient photoluminescence (NTRT-PL) spectra. Fristly, E-ZnO and R-ZnO nanoarchitectures were fabricated via facilitating the electrochemical route; and then, they decorated it with dispersed Au nanoparticles (NPs) by the methods of ion-sputtering deposition, constituting Au/E-ZnO and Au/R-ZnO Schottky-heterojunction nanocomplex, which is characterized by SEM, XRD, Raman analysis, and UV-vis absorption spectra. Steady-state photoluminescence and NTRT-PL spectra of as-fabricated Au/E-ZnO and Au/R-ZnO nanocomposites were probed for interfacial charge transfer process under 266 nm femtosecond (fs) light irradiation. Simultaneously, a distinct diversification for the NTRT-PL spectra is observed, closely associating with oxygen vacancies (Vo), which is confirmed by X-ray photoelectron spectroscopy (XPS) and electron spin resonance (ESR) spectra. Furthermore, Au NPs act as an “annular bridge” and “transit depot” for interfacial charge transfer through local surface plasmon resonance (LSPR) effect and Schottky barrier, respectively, which is identified by NTRT-PL and time-resolved PL (TRPL) decay spectrum. Moreover, this mechanism is responsible for the enhanced photoelectrochemical (PEC) performances of methyl orange (MO) photodegradation under UV light irradiation.

scholarly journals Intramolecular Photo-Oxidation as a Potential Source to Probe Biological Electron Damage: A Carboxylated Adenosine Analogue as Case Study

Molecules ◽  
2021 ◽  
Vol 26 (10) ◽  
pp. 2877
Author(s):  
Maria Elena Castellani ◽  
Jan R. R. Verlet
Keyword(s):  
Charge Transfer ◽  
Carboxylic Acid ◽  
Molecular Orbital ◽  
Photoelectron Spectroscopy ◽  
Density Functional ◽  
Adenosine Monophosphate ◽  
Time Resolved ◽  
Starting Point ◽  
Molecular Charge ◽  
Intra Molecular Charge Transfer

A carboxylated adenosine analog (C-Ado−) has been synthesized and probed via time-resolved photoelectron spectroscopy in order to induce intra-molecular charge transfer from the carboxylic acid moiety to the nucleobase. Intra-molecular charge transfer can be exploited as starting point to probe low-energy electron (LEE) damage in DNA and its derivatives. Time-dependent density functional theory (TD-DFT) calculations at the B3LYP-6311G level of theory have been performed to verify that the highest occupied molecular orbital (HOMO) was located on carboxylic acid and that the lowest occupied molecular orbital (LUMO) was on the nucleobase. Hence, the carboxylic acid could work as electron source, whilst the nucleobase could serve the purpose of electron acceptor. The dynamics following excitation at 4.66 eV (266 nm) were probed using time-resolved photoelectron spectroscopy using probes at 1.55 eV (800 nm) and 3.10 eV (400 nm). The data show rapid decay of the excited state population and, based on the similarity of the overall dynamics to deoxy-adenosine monophosphate (dAMP–), it appears that the dominant decay mechanism is internal conversion following 1ππ* excitation of the nucleobase, rather than charge-transfer from the carboxylic acid to the nucleobase.

Time-resolved radiation chemistry: femtosecond photoelectron spectroscopy of electron attachment and photodissociation dynamics in iodide–nucleobase clusters

2019 ◽  
Vol 21 (14) ◽  
pp. 7239-7255 ◽  
Author(s):  
Alice Kunin ◽  
Daniel M. Neumark
Keyword(s):  
Dna Damage ◽  
Charge Transfer ◽  
Pump Pulse ◽  
Photoelectron Spectroscopy ◽  
Electron Attachment ◽  
Radiation Chemistry ◽  
Low Energy ◽  
Energy Electron ◽  
Time Resolved ◽  
Low Energy Electron

The pump pulse initiates intracluster charge transfer, creating transient nucleobase anions that model DNA damage pathways induced by low-energy electron attachment.

Time-resolved photoelectron spectroscopy of IR-driven electron dynamics in a charge transfer model system

2017 ◽  
Vol 19 (30) ◽  
pp. 19683-19690 ◽  
Author(s):  
Mirjam Falge ◽  
Friedrich Georg Fröbel ◽  
Volker Engel ◽  
Stefanie Gräfe
Keyword(s):  
Charge Transfer ◽  
Photoelectron Spectroscopy ◽  
Model System ◽  
Photoelectron Spectra ◽  
Transfer Model ◽  
Electron Dynamics ◽  
Time Resolved ◽  
System P ◽  
A Charge ◽  
Charge Transfer Model

IR and XUV pulse interaction result in modulated asymmetries of photoelectron spectra.

scholarly journals Attosecond intra-valence band dynamics and resonant-photoemission delays in W(110)

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
S. Heinrich ◽  
T. Saule ◽  
M. Högner ◽  
Y. Cui ◽  
V. S. Yakovlev ◽  
...  
Keyword(s):  
Valence Band ◽  
Photoelectron Spectroscopy ◽  
Electronic Band Structure ◽  
Photoelectric Effect ◽  
Final State ◽  
Electronic Band ◽  
Time Resolved ◽  
Resonant Photoemission ◽  
Pulse Trains ◽  
Electron Correlation Effects

AbstractTime-resolved photoelectron spectroscopy with attosecond precision provides new insights into the photoelectric effect and gives information about the timing of photoemission from different electronic states within the electronic band structure of solids. Electron transport, scattering phenomena and electron-electron correlation effects can be observed on attosecond time scales by timing photoemission from valence band states against that from core states. However, accessing intraband effects was so far particularly challenging due to the simultaneous requirements on energy, momentum and time resolution. Here we report on an experiment utilizing intracavity generated attosecond pulse trains to meet these demands at high flux and high photon energies to measure intraband delays between sp- and d-band states in the valence band photoemission from tungsten and investigate final-state effects in resonant photoemission.

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