Attosecond Transient Absorption Spectroscopy for Real-Time Observation of Valence Electron Motion

2010 ◽  
Author(s):  
A. Wirth ◽  
E. Goulielmakis ◽  
Z.-H. Loh ◽  
R. Santra ◽  
N. Rohringer ◽  
...  
Keyword(s):  
Real Time ◽  
Absorption Spectroscopy ◽  
Valence Electron ◽  
Transient Absorption ◽  
Transient Absorption Spectroscopy ◽  
Electron Motion ◽  
Time Observation ◽  
Real Time Observation

scholarly journals Real-time observation of the intravalley spin-flip process in single-layer WS2

2019 ◽  
Vol 205 ◽  
pp. 05012
Author(s):  
Zilong Wang ◽  
Alejandro Molina-Sanchez ◽  
Patrick Altmann ◽  
Davide Sangalli ◽  
Domenico De Fazio ◽  
...  
Keyword(s):  
Real Time ◽  
Conduction Band ◽  
Transient Absorption ◽  
Single Layer ◽  
Transient Absorption Spectroscopy ◽  
Spin Orientation ◽  
Lower Conduction Band ◽  
Spin Polarized ◽  
Time Observation ◽  
Real Time Observation

We use helicity-resolved transient absorption spectroscopy to track intravalley scattering dynamics in monolayer WS2. We find that spin-polarized carriers scatter from upper to lower conduction band by reversing their spin orientation on a sub-ps timescale.

scholarly journals Real-time observation of valence electron motion

Nature ◽  
2010 ◽  
Vol 466 (7307) ◽  
pp. 739-743 ◽  
Author(s):  
Eleftherios Goulielmakis ◽  
Zhi-Heng Loh ◽  
Adrian Wirth ◽  
Robin Santra ◽  
Nina Rohringer ◽  
...  
Keyword(s):  
Real Time ◽  
Valence Electron ◽  
Electron Motion ◽  
Time Observation ◽  
Real Time Observation

scholarly journals Mapping the multi-step mechanism of a photoredox catalyzed atom-transfer radical polymerization reaction by direct observation of the reactive intermediates

2020 ◽  
Vol 11 (17) ◽  
pp. 4475-4481 ◽  
Author(s):  
Luke Lewis-Borrell ◽  
Mahima Sneha ◽  
Aditi Bhattacherjee ◽  
Ian P. Clark ◽  
Andrew J. Orr-Ewing
Keyword(s):  
Atom Transfer Radical Polymerization ◽  
Real Time ◽  
Radical Polymerization ◽  
Absorption Spectroscopy ◽  
Direct Observation ◽  
Transient Absorption ◽  
Reactive Intermediates ◽  
Transient Absorption Spectroscopy ◽  
Polymerization Reaction ◽  
Step Mechanism

Short-lived intermediates are tracked in real-time by transient absorption spectroscopy during a multi-step photoredox catalysed polymerization reaction.

Real-time observation of ultrafast electron injection at graphene–Zn porphyrin interfaces

2015 ◽  
Vol 17 (14) ◽  
pp. 9015-9019 ◽  
Author(s):  
Dilshad Masih ◽  
Shawkat M. Aly ◽  
Anwar Usman ◽  
Erkki Alarousu ◽  
Omar F. Mohammed
Keyword(s):  
Electron Transfer ◽  
Real Time ◽  
Absorption Spectra ◽  
Transient Absorption ◽  
Ion Pairs ◽  
Electron Injection ◽  
Transient Absorption Spectra ◽  
Femtosecond Transient Absorption ◽  
Time Observation ◽  
Real Time Observation

Femtosecond transient absorption spectra of zinc(ii) porphyrin in the presence of graphene carboxylate (GC) reveal ultrafast electron transfer from the singlet excited ZnTMPyP* to GC, forming ZnTMPyP˙+ and GC˙− radical ion pairs.

Black-Box, Real-Time Simulations of Transient Absorption Spectroscopy

2016 ◽  
Vol 7 (8) ◽  
pp. 1590-1595 ◽  
Author(s):  
Triet S. Nguyen ◽  
Joong Hoon Koh ◽  
Susan Lefelhocz ◽  
John Parkhill
Keyword(s):  
Real Time ◽  
Absorption Spectroscopy ◽  
Transient Absorption ◽  
Black Box ◽  
Transient Absorption Spectroscopy ◽  
Real Time Simulations

scholarly journals Combined probes of X-ray scattering and optical spectroscopy reveal how global conformational change is temporally and spatially linked to local structural perturbation in photoactive yellow protein

2016 ◽  
Vol 18 (13) ◽  
pp. 8911-8919 ◽  
Author(s):  
Tae Wu Kim ◽  
Cheolhee Yang ◽  
Youngmin Kim ◽  
Jong Goo Kim ◽  
Jeongho Kim ◽  
...  
Keyword(s):  
Real Time ◽  
Conformational Change ◽  
Absorption Spectroscopy ◽  
Structural Changes ◽  
Transient Absorption ◽  
Transient Absorption Spectroscopy ◽  
Photoactive Yellow Protein ◽  
Time Resolved ◽  
X Ray ◽  
X Ray Scattering

Structural changes in global conformation and chromophore of photoactive yellow protein are probed in real time by time-resolved X-ray solution scattering and transient absorption spectroscopy.

Fully Atomistic Real-Time Simulations of Transient Absorption Spectroscopy

2018 ◽  
Vol 9 (15) ◽  
pp. 4355-4359 ◽  
Author(s):  
Franco P. Bonafé ◽  
Federico J. Hernández ◽  
Bálint Aradi ◽  
Thomas Frauenheim ◽  
Cristián G. Sánchez
Keyword(s):  
Real Time ◽  
Absorption Spectroscopy ◽  
Transient Absorption ◽  
Transient Absorption Spectroscopy ◽  
Real Time Simulations

scholarly journals Tracking the insulator-to-metal phase transition in VO2with few-femtosecond extreme UV transient absorption spectroscopy

2017 ◽  
Vol 114 (36) ◽  
pp. 9558-9563 ◽  
Author(s):  
Marieke F. Jager ◽  
Christian Ott ◽  
Peter M. Kraus ◽  
Christopher J. Kaplan ◽  
Winston Pouse ◽  
...  
Keyword(s):  
Phase Transition ◽  
Real Time ◽  
Absorption Spectroscopy ◽  
Transient Absorption ◽  
Metallic Phase ◽  
Transient Absorption Spectroscopy ◽  
Metal Phase ◽  
Model Calculations ◽  
Extreme Uv ◽  
Metal Phase Transition

Coulomb correlations can manifest in exotic properties in solids, but how these properties can be accessed and ultimately manipulated in real time is not well understood. The insulator-to-metal phase transition in vanadium dioxide (VO2) is a canonical example of such correlations. Here, few-femtosecond extreme UV transient absorption spectroscopy (FXTAS) at the vanadiumM2,3edge is used to track the insulator-to-metal phase transition in VO2. This technique allows observation of the bulk material in real time, follows the photoexcitation process in both the insulating and metallic phases, probes the subsequent relaxation in the metallic phase, and measures the phase-transition dynamics in the insulating phase. An understanding of the VO2absorption spectrum in the extreme UV is developed using atomic cluster model calculations, revealing V3+/d2character of the vanadium center. We find that the insulator-to-metal phase transition occurs on a timescale of 26 ± 6 fs and leaves the system in a long-lived excited state of the metallic phase, driven by a change in orbital occupation. Potential interpretations based on electronic screening effects and lattice dynamics are discussed. A Mott–Hubbard-type mechanism is favored, as the observed timescales and d2nature of the vanadium metal centers are inconsistent with a Peierls driving force. The findings provide a combined experimental and theoretical roadmap for using time-resolved extreme UV spectroscopy to investigate nonequilibrium dynamics in strongly correlated materials.

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