Journal: The Journal of Physical Chemistry Letters

Abbreviation

J. Phys. Chem. Lett.

Publisher

American Chemical Society

Journal Volumes

ISSN

1948-7185

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2010 - 2019962020 - 202579
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Publications 1 - 10 of 175
  • Single-Molecule AFM Study of DNA Damage by 1O2 Generated from Photoexcited C60
    Item type: Journal Article
    Ray, Ankita; Liosi, Korinne; Ramakrishna, Shivaprakash N.; et al. (2020)
    The Journal of Physical Chemistry Letters
    Light-induced oxidative damage of DNA by 1O2 generated from photoexcited C60 was observed at the single-molecule level by atomic force microscopy (AFM) imaging. Two types of DNA origami with uniform morphologies were immobilized on a mica surface and used as DNA substrates. Upon visible light irradiation (528 nm) in the presence of a C60 aqueous solution, the morphology changes of DNA origami substrates were observed by time-lapse AFM imaging at the single-molecule level by tracking a discrete DNA molecule. The origami showed nicked and flattened morphologies with relaxed features caused by the covalent cleavage of the DNA strands. The involvement of 1O2 in the on-surface DNA damage was clearly confirmed by AFM experiments in the presence of a 1O2 quencher and ESR measurements with a spin-trapping agent for 1O2. This study is the first example of single-molecule observation of oxidative damage of DNA by AFM with corresponding morphology changes in a photocontrolled and time-dependent manner by 1O2 generated catalytically from photoexcited C60. © 2020 American Chemical Society.
  • Radiative and Nonradiative Recombination in CuInS2 Nanocrystals and CuInS2-Based Core/Shell Nanocrystals
    Item type: Journal Article
    Berends, Anne C.; Rabouw, Freddy T.; Spoor, Frank C.M.; et al. (2016)
    The Journal of Physical Chemistry Letters
  • Quantum Tunnelling Driven H2 Formation on Graphene
    Item type: Journal Article
    Han, Erxun; Fang, Wei; Stamatakis, Michail; et al. (2022)
    The Journal of Physical Chemistry Letters
    It is commonly believed that it is unfavorable for adsorbed H atoms on carbonaceous surfaces to form H2 without the help of incident H atoms. Using ring-polymer instanton theory to describe multidimensional tunnelling effects, combined with ab initio electronic structure calculations, we find that these quantum-mechanical simulations reveal a qualitatively different picture. Recombination of adsorbed H atoms, which was believed to be irrelevant at low temperature due to high barriers, is enabled by deep tunnelling, with reaction rates enhanced by tens of orders of magnitude. Furthermore, we identify a new path for H recombination that proceeds via multidimensional tunnelling but would have been predicted to be unfeasible by a simple one-dimensional description of the reaction. The results suggest that hydrogen molecule formation at low temperatures are rather fast processes that should not be ignored in experimental settings and natural environments with graphene, graphite, and other planar carbon segments.
  • Microslips to "Avalanches" in Confined, Molecular Layers of Ionic Liquids
    Item type: Journal Article
    Espinosa-Marzal, R. M.; Arcifa, A.; Rossi, A.; et al. (2014)
    The Journal of Physical Chemistry Letters
  • Surface Propensity of Aqueous Atmospheric Bromine at the Liquid–Gas Interface
    Item type: Journal Article
    Gladich, Ivan; Chen, Shuzhen; Vazdar, Mario; et al. (2020)
    The Journal of Physical Chemistry Letters
  • Tuning Interparticle Hydrogen Bonding in Shear-Jamming Suspensions: Kinetic Effects and Consequences for Tribology and Rheology
    Item type: Journal Article
    James, Nicole M.; Hsu, Chiao-Peng; Spencer, Nicholas D.; et al. (2019)
    The Journal of Physical Chemistry Letters
  • Energy Absorption and Beam Damage during Microfocus Synchrotron X-ray Diffraction
    Item type: Journal Article
    Stanko, Štefan T.; Schawe, Jürgen E.K.; Spieckermann, Florian; et al. (2024)
    The Journal of Physical Chemistry Letters
    In this study, we combine in situ fast differential scanning calorimetry (FDSC) with synchrotron X-ray measurements to study simultaneously the structure and thermophysical properties of materials. Using the example of the organic compound BCH-52, we show that the X-ray beam can heat the sample and induce a shift of the heat-flow signal. The aim of this paper is to investigate the influence of radiation on sample behavior. The calorimetric data is used to quantify the absorbed beam energy and, together with the diffraction data, reveal an irreversible damage of the sample. The results are especially important for materials with high absorption coefficients and for high-energy X-ray and electron beams. Our findings illustrate that FDSC combined with X-ray diffraction is a suitable characterization method when beam damage must be minimized.
  • RIDME Spectroscopy: New Topics Beyond the Determination of Electron Spin-Spin Distances
    Item type: Review Article
    Kuzin, Sergei; Yulikov, Maxim (2025)
    The Journal of Physical Chemistry Letters
    Relaxation-induced dipolar modulation enhancement (RIDME) is a pulse EPR experiment originally designed to determine distances between spin labels. However, RIDME has several features that make it an efficient tool in a number of "nonconventional" applications, away from the original purpose of this pulse experiment. RIDME appears to be an interesting experiment to probe longitudinal electron spin dynamics, e.g., in relation to qubits research, to probe distributions of exchange couplings, useful for the design of molecular magnets, and to determine important details of electron spin interactions with the nuclear spin bath, which is related to the dynamic nuclear polarization and soft materials research. We also anticipate interesting applications of RIDME in the structural biology of biopolymers as well as their interactions, aggregation, and phase separation. It is not excluded that in the near future such "nonconventional" topics could grow in number and evolve into the main application area of RIDME.
  • Spatial Correlations Drive Long-Range Transport and Trapping of Excitons in Single H-Aggregates: Experiment and Theory
    Item type: Journal Article
    Carta, Alberto; Wittmann, Bernd; Kreger, Klaus; et al. (2024)
    The Journal of Physical Chemistry Letters
    Describing long-range energy transport is a crucial step, both toward deepening our knowledge on natural light-harvesting systems and toward developing novel photoactive materials. Here, we combine experiment and theory to resolve and reproduce energy transport on pico- to nanosecond time scales in single H-type supramolecular nanofibers based on carbonyl-bridged triarylamines (CBT). Each nanofiber shows energy transport dynamics over long distances up to similar to 1 mu m, despite exciton trapping at specific positions along the nanofibers. Using a minimal Frenkel exciton model including disorder, we demonstrate that spatial correlations in the normally distributed site energies are crucial to reproduce the experimental data. In particular, we can observe the long-range and subdiffusive nature of the exciton dynamics as well as the trapping behavior of excitons in specific locations of the nanofiber. This trapping behavior introduces a net directionality or asymmetry in the exciton dynamics as observed experimentally.
  • Operando Photoelectron Photoion Coincidence Spectroscopy Unravels Mechanistic Fingerprints of Propane Activation by Catalytic Oxyhalogenation
    Item type: Journal Article
    Zichittella, Guido; Hemberger, Patrick; Holzmeier, Fabian; et al. (2020)
    The Journal of Physical Chemistry Letters
Publications 1 - 10 of 175