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Ultra-short pulse laser acceleration of protons to 80 MeV from cryogenic hydrogen jets tailored to near-critical density.
Nat Commun
July 2023
Helmholtz-Zentrum Dresden - Rossendorf, Institute of Radiation Physics, Bautzner Landstr. 400, 01328, Dresden, Germany.
Laser plasma-based particle accelerators attract great interest in fields where conventional accelerators reach limits based on size, cost or beam parameters. Despite the fact that particle in cell simulations have predicted several advantageous ion acceleration schemes, laser accelerators have not yet reached their full potential in producing simultaneous high-radiation doses at high particle energies. The most stringent limitation is the lack of a suitable high-repetition rate target that also provides a high degree of control of the plasma conditions required to access these advanced regimes.
View Article and Find Full Text PDFSpin-dependent properties of optical modes guided by adiabatic trapping potentials in photonic Dirac metasurfaces.
Nat Nanotechnol
August 2023
Electrical Engineering and Physics, The City College of New York, New York, NY, USA.
The Dirac-like dispersion in photonic systems makes it possible to mimic the dispersion of relativistic spin-1/2 particles, which led to the development of the concept of photonic topological insulators. Despite recent demonstrations of various topological photonic phases, the full potential offered by Dirac photonic systems, specifically their ability to emulate the spin degree of freedom-referred to as pseudo-spin-beyond topological boundary modes has remained underexplored. Here we demonstrate that photonic Dirac metasurfaces with smooth one-dimensional trapping gauge potentials serve as effective waveguides with modes carrying pseudo-spin.
View Article and Find Full Text PDFTheoretical Calculation of Core-Excited States along Dissociative Pathways beyond Second-Order Perturbation Theory.
J Chem Theory Comput
January 2022
Department of Chemistry and Cherry Emerson Center for Scientific Computation, Emory University, Atlanta, Georgia 30322, United States.
We extend the multireference driven similarity renormalization (MR-DSRG) method to compute core-excited states by combining it with a GASSCF treatment of orbital relaxation and static electron correlation effects. We consider MR-DSRG treatments of dynamical correlation truncated at the level of perturbation theory (DSRG-MRPT2/3) and iterative linearized approximations with one- and two-body operators [MR-LDSRG(2)] in combination with a spin-free exact-two-component (X2C) one-electron treatment of scalar relativistic effects. This approach is calibrated and tested on a series of 16 core-excited states of five closed- and open-shell diatomic molecules containing first-row elements (C, N, and O).
View Article and Find Full Text PDFLow-Lying Electronic States of the Nickel Dimer.
Front Chem
May 2021
Chemistry Department, University of North Dakota, Grand Forks, ND, United States.
The generalized Van Vleck second order multireference perturbation theory (GVVPT2) method was used to investigate the low-lying electronic states of Ni. Because the nickel atom has an excitation energy of only 0.025 eV to its first excited state (the least in the first row of transition elements), Ni has a particularly large number of low-lying states.
View Article and Find Full Text PDFTheoretical study of Au clusters (n = 1-5) deposited on a rutile TiO (110) slab, concerning structure and stability.
J Comput Chem
December 2020
Departamento de Física, Facultad de Ciencias, UNAM, CU, Ciudad de México, Mexico.
The initial nucleation of gold clusters Au (n = 1-5) on TiO rutile (110) reduced surface is studied using density functional theory and a full-potential augmented-plane-wave method implemented in the WIEN2k code. The first two gold atoms remained tied to the surface with a bond length similar to those belonging to other well-known related materials, while the other gold atoms do not spread over the surface; they preferred to form a new layer. The occurrence of relativistic effects produced a preferential triangle geometry for Au and a combination of triangular units for Au and Au .
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