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Direct Evidence of Breakdown of Spin Statistics in Ion-Atom Charge Exchange Collisions.
Phys Rev Lett
October 2024
Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China.
Recent experimental studies have questioned the validity of spin statistics assumptions, particularly in charge exchange processes occurring in atomic MeV collisions. Here, we study spin-resolved single electron capture processes in collisions between C^{3+} ions and helium within an energy range of 1.25-400 keV/u.
View Article and Find Full Text PDFObservation of Interatomic Coulombic Decay Induced by Double Excitation of Helium in Nanodroplets.
Phys Rev Lett
June 2024
Department of Physics and Astronomy, Aarhus University, 8000 Aarhus C, Denmark.
Interatomic Coulombic decay (ICD) plays a crucial role in weakly bound complexes exposed to intense or high-energy radiation. So far, neutral or ionic atoms or molecules have been prepared in singly excited electron or hole states that can transfer energy to neighboring centers and cause ionization and radiation damage. Here we demonstrate that a doubly excited atom, despite its extremely short lifetime, can decay by ICD; evidenced by high-resolution photoelectron spectra of He nanodroplets excited to the 2s2p+ state.
View Article and Find Full Text PDFExtreme ultraviolet (EUV) transient absorption spectrum of helium dressed by a moderately intense infrared laser pulse is investigated. Strategies for correct retrieval of the time-dependent quasi-energies of helium with excitation energies covering both singly and doubly excited states are proposed. For long-lived singly excited states, the profound hyperbolic structures due to long lasting dipole can be diminished by convoluting the transient absorption spectrogram with a spectral window, allowing the time-dependent quasi-energies close to 1s2p resonance to be correctly mapped out.
View Article and Find Full Text PDFMeasuring the α-particle charge radius with muonic helium-4 ions.
Nature
January 2021
Institute for Particle Physics and Astrophysics, ETH Zurich, Zurich, Switzerland.
The energy levels of hydrogen-like atomic systems can be calculated with great precision. Starting from their quantum mechanical solution, they have been refined over the years to include the electron spin, the relativistic and quantum field effects, and tiny energy shifts related to the complex structure of the nucleus. These energy shifts caused by the nuclear structure are vastly magnified in hydrogen-like systems formed by a negative muon and a nucleus, so spectroscopy of these muonic ions can be used to investigate the nuclear structure with high precision.
View Article and Find Full Text PDFCircular Holographic Ionization-Phase Meter.
Phys Rev Lett
September 2019
Department of Physics, University of Central Florida, Orlando, Florida 32816, USA.
We propose an attosecond extreme ultraviolet pump IR-probe photoionization protocol that employs pairs of counterrotating consecutive harmonics and angularly resolved photoelectron detection, thereby providing a direct measurement of ionization phases. The present method, which we call circular holographic ionization-phase meter, gives also access to the phase of photoemission amplitudes of even-parity continuum states from a single time-delay measurement since the relative phase of one- and two-photon ionization pathways is imprinted in the photoemission anisotropy. The method is illustrated with ab initio simulations of photoionization via autoionizing resonances in helium.
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