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Dynamic anti-correlations of water hydrogen bonds.
Nat Commun
December 2024
Max-Planck Institute for Polymer Research, Ackermannweg 10, Mainz, Germany.
Water is characterized by strong intermolecular hydrogen bonds (H-bonds) between molecules. The two hydrogen atoms in one water molecule can form H-bonds of dissimilar length. Although intimately connected to water's anomalous properties, the details and the origins of the asymmetry have remained elusive.
View Article and Find Full Text PDFSubpicosecond Spectroscopic Ellipsometry of the Photoinduced Phase Transition in VO Thin Films.
ACS Photonics
November 2024
Ecole Centrale de Lyon, CNRS, INSA Lyon, Université Claude Bernard Lyon 1, CPE Lyon, CNRS, INL, UMR5270, Université Lyon, 69130 Ecully, France.
We report the first application of broadband time-resolved pump-probe ellipsometry to study the ultrafast dynamics of the photoinduced insulator-to-metal transition (IMT) in vanadium dioxide (VO) thin films driven by 35 fs laser pulses. This novel technique enables the direct measurement of the time-resolved evolution of the complex pseudodielectric function of VO during the IMT. We have identified distinct thermal and nonthermal dynamics in the photoinduced IMT, which critically depends on the pump wavelength and fluence, while providing a detailed temporal and spectral phase map.
View Article and Find Full Text PDFLong-lived isospin excitations in magic-angle twisted bilayer graphene.
Nature
September 2024
Department of Physics, University of California at Santa Barbara, Santa Barbara, CA, USA.
Numerous correlated many-body phases, both conventional and exotic, have been reported in magic-angle twisted bilayer graphene (MATBG). However, the dynamics associated with these correlated states, crucial for understanding the underlying physics, remain unexplored. Here we combine exciton sensing and optical pump-probe spectroscopy to investigate the dynamics of isospin orders in MATBG with WSe substrate across the entire flat band, achieving sub-picosecond resolution.
View Article and Find Full Text PDFThe photoactivated dynamics of dGpdC and dCpdG sequences in DNA: a comprehensive quantum mechanical study.
Chem Sci
June 2024
Istituto di Biostrutture e Bioimmagini-CNR (IBB-CNR) Via De Amicis 95 I-80145 Napoli Italy
Study of alternating DNA GC sequences by different time-resolved spectroscopies has provided fundamental information on the interaction between UV light and DNA, a process of great biological importance. Multiple decay paths have been identified, but their interplay is still poorly understood. Here, we characterize the photophysics of GC-DNA by integrating different computational approaches, to study molecular models including up to 6 bases described at a full quantum mechanical level.
View Article and Find Full Text PDFThe Ring-Closing Reaction of Cyclopentadiene Probed with Ultrafast X-ray Scattering.
J Phys Chem A
June 2024
Department of Chemistry, Brown University, Providence, Rhode Island 02912, United States.
Article Synopsis
- Researchers studied cyclopentadiene (CP) after exciting it with light at 243 nm using advanced X-ray techniques at LCLS.
- They found direct evidence that CP quickly transforms into bicyclo[2.1.0]pentene (BP), a unique molecule with strained rings.
- BP reverts back to CP over about 21 picoseconds, with a smaller proportion of reactions occurring on a subpicosecond timescale.
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