Publications de Gerald Auböck

Electron Dynamics in Anatase TiO2 Nanoparticles by Ultrafast Broadband Deep-Ultraviolet Spectroscopy

Majed Chergui, Edoardo Baldini, Enrico Pomarico, Tania Palmieri, Gerald Auböck

The optical bandgap of anatase TiO2 nanoparticles is dominated by bulk absorption bands in the deep-ultraviolet due to strongly bound excitons. These spectral features can be utilized as a sensitive probe of carrier and lattice dynamics inside the TiO2 nan ...

E D P SCIENCES2019

Phonon-Driven Selective Modulation of Exciton Oscillator Strengths in Anatase TiO2Nanoparticles

Majed Chergui, Edoardo Baldini, Tania Palmieri, Enrico Pomarico, Thomas Charles Henry Rossi, Malte Oppermann, Gerald Auböck

The way nuclear motion affects electronic responses has become a very hot topic in materials science. Coherent acoustic phonons can dynamically modify optical, magnetic, and mechanical properties at ultrasonic frequencies, with promising applications as se ...

American Chemical Society (ACS)2018

Clocking the Ultrafast Electron Cooling in Anatase Titanium Dioxide Nanoparticles

Majed Chergui, Edoardo Baldini, Enrico Pomarico, Tania Palmieri, Gerald Auböck

2018

Vibrational coherence transfer in the ultrafast intersystem crossing of a diplatinum complex in solution

Majed Chergui, Ivano Tavernelli, Gloria Capano, Gerald Auböck, Roberto Monni

National Academy of Sciences2018

Photoaquation Mechanism of Hexacyanoferrate(II) Ions: Ultrafast 2D UV and Transient Visible and IR Spectroscopies

Majed Chergui, Marco Eli Reinhard, Thomas James Penfold, Gerald Auböck, Raphaël Horváth

Ferrous iron(II) hexacyanide in aqueous solutions is known to undergo photoionization and photoaquation reactions depending on the excitation wavelength. To investigate this wavelength dependence, we implemented ultrafast two-dimensional UV transient absor ...

American Chemical Society2017

Conservation of vibrational coherence in ultrafast electronic relaxation: The case of diplatinum complexes in solution

Majed Chergui, Dominik Kinschel, Gerald Auböck, Roberto Monni, Kathrin Maria Aziz-Lange

We report the results of ultrafast transient absorption studies of tetrakis(l-pyrophosphito) diplatinate(II), Pt-2(mu-P(2)O(5)H2)(4) (Pt(pop)) and its perfluoroborated derivative Pt-2(mu-P2O5(BF2)(4) (Pt(pop-BF2)) in water and acetonitrile upon e ...

Elsevier2017

Strongly bound excitons in anatase TiO2 single crystals and nanoparticles

Majed Chergui, Marco Grioni, Edoardo Baldini, Arnaud Magrez, Gerald Auböck, Helmuth Berger, Simon Karl Moser

Anatase TiO2 is among the most studied materials for light-energy conversion applications, but the nature of its fundamental charge excitations is still unknown. Yet it is crucial to establish whether light absorption creates uncorrelated electron-hole pai ...

Nature Publishing Group2017

Interfacial Electron Injection Probed by a Substrate-Specific Excitonic Signature

Majed Chergui, Edoardo Baldini, Enrico Pomarico, Thomas Charles Henry Rossi, Malte Oppermann, Tania Palmieri, Gerald Auböck

Ultrafast interfacial electron transfer in sensitized solar cells has mostly been probed by visible-to-terahertz radiation, which is sensitive to the free carriers in the conduction band of the semiconductor substrate. Here, we demonstrate the use of deep- ...

2017

Sub-50-fs photoinduced spin crossover in [Fe(bpy)(3)](2+)

Majed Chergui, Gerald Auböck

It is known that excitation by visible light of the singlet metal-to-ligand charge-transfer (1MLCT) states of Fe(II) complexes leads to population of the lowest-lying high-spin quintet state (T-5) with unity quantum yield. Here we investigate this so-calle ...

Nature Publishing Group2015

Set-up for broadband Fourier-transform multidimensional electronic spectroscopy

Majed Chergui, Frank van Mourik, Christopher Alexander Arrell, Andre Al Haddad, José Javier Pancracio Ojeda Andara, Gerald Auböck, Adrien Alexis Paul Chauvet

We present a compact passively phase-stabilized ultra-broadband 2D Fourier transform setup. A gas (argon)-filled hollow core fiber pumped by an amplified Ti:Al2O3 laser is used as a light source providing spectral range spanning from 420 to 900 nm. Sub-10- ...

Optical Society of America2015