FS-ATTO

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2019-01-28
11:38
OpenAccess [PUBDB-2019-00763] Journal Article
et al
Reconstruction of the time-dependent electronic wave packet arising from molecular autoionization
Science advances 4(8), eaat3962 - () [10.1126/sciadv.aat3962]  GO
Autoionizing resonances are paradigmatic examples of two-path wave interferences between direct photoionization, which takes a few attoseconds, and ionization via quasi-bound states, which takes much longer. Time-resolving the evolution of these interferences has been a long-standing goal, achieved recently in the helium atom owing to progress in attosecond technologies [...]
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2019-01-11
11:24
[PUBDB-2019-00394] Journal Article
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Solvent control of charge transfer excited state relaxation pathways in $\mathrm{[Fe(2,2′-bipyridine)(CN)_{4} ]^{2−}}$
The excited state dynamics of solvated $[Fe(bpy)(CN)_{4}]^{2−}$, where bpy = 2,2′-bipyridine, show significant sensitivity to the solvent Lewis acidity. Using a combination of optical absorption and X-ray emission transient spectroscopies, we have previously shown that the metal to ligand charge transfer (MLCT) excited state of $[Fe(bpy)(CN)_{4}]^{2−}$ has a 19 picosecond lifetime and no discernable contribution from metal centered (MC) states in weak Lewis acid solvents, such as dimethyl sulfoxide and acetonitrile.1,2 In the present work, we use the same combination of spectroscopic techniques to measure the MLCT excited state relaxation dynamics of $[Fe(bpy)(CN)_{4}]^{2−}$ in water, a strong Lewis acid solvent. [...]
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2019-01-11
11:13
[PUBDB-2019-00392] Journal Article
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Photostability and Photodegradation Processes in Colloidal $\mathrm{CsPbI_{3}}$ Perovskite Quantum Dots
ll-inorganic $\mathrm{CsPbI_{3}}$ perovskite quantum dots (QDs) have attracted intense attention for their successful application in photovoltaics (PVs) and optoelectronics that are enabled by their superior absorption capability and great photoluminescence (PL) properties. However, their photostability remains a practical bottleneck and further optimization is highly desirable. [...]
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2019-01-10
11:21
[PUBDB-2019-00272] Journal Article
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Inorganic Ions Assisted the Anisotropic Growth of $\mathrm{CsPbCl_{3}}$ Nanowires with Surface Passivation Effect
All-inorganic halide perovskite nanowires (NWs) exhibit improved thermal and hydrolysis stability and could thus play a vital role in nanoscale optoelectronics. Among them, blue-light-based devices are extremely limited because of the lack of a facile method to obtain high-purity $\mathrm{CsPbCl_{3}}$ NWs. [...]
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2019-01-10
09:36
[PUBDB-2019-00256] Journal Article
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Inter-phase charge and energy transfer in Ruddlesden–Popper 2D perovskites: critical role of the spacing cations
Photo-generated charge carrier dynamics in Ruddlesden–Popper 2D perovskites with linear (n-BA) and branched (iso-BA) butylamine as spacing cations have been studied by using transient absorption and time-resolved photoluminescence spectroscopies. Both n-BA and iso-BA perovskites consist of mixed-phase 2D quantum wells with various layer thicknesses, where the photo-generated charges undergo inter-phase charge transfer from thinner quantum wells to thicker ones. [...]
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2019-01-07
16:38
OpenAccess [PUBDB-2019-00067] Journal Article
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Publisher Correction: Coherent diffractive imaging of single helium nanodroplets with a high harmonic generation source
Coherent diffractive imaging of individual free nanoparticles has opened routes for the in situ analysis of their transient structural, optical, and electronic properties. So far, single-shot single-particle diffraction was assumed to be feasible only at extreme ultraviolet and X-ray free-electron lasers, restricting this research field to large-scale facilities. [...]
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2018-10-15
15:08
[PUBDB-2018-03796] Journal Article
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Ultrafast Hydrogen Migration in Photoionized Glycine
Hydrogen migration in the glycine cation has been investigated using a combination of a short train of attosecond extreme ultraviolet pulses with few-optical-cycle near-infrared pulses. The yield of the photofragments produced has been measured as a function of pump–probe delay. [...]
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2018-10-01
15:15
[PUBDB-2018-03690] Journal Article
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Attosecond spectroscopy of bio-chemically relevant molecules
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2018-10-01
15:00
[PUBDB-2018-03687] Journal Article
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Attosecond Pump–Probe Spectroscopy of Charge Dynamics in Tryptophan
Attosecond pump–probe experiments performed in small molecules have allowed tracking charge dynamics in the natural time scale of electron motion. That this is also possible in biologically relevant molecules is still a matter of debate, because the large number of available nuclear degrees of freedom might destroy the coherent charge dynamics induced by the attosecond pulse. [...]
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2018-01-23
10:34
Embargoed OpenAccess [PUBDB-2018-00754] Journal Article
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Transferring the entatic-state principle to copper photochemistry
Nature chemistry 10, 355 – 362 () [10.1038/nchem.2916]  GO
The entatic state denotes a distorted coordination geometry of a complex from its typical arrangement that generates an improvement to its function. The entatic-state principle has been observed to apply to copper electron-transfer proteins and it results in a lowering of the reorganization energy of the electron-transfer process. [...]
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