Article
Optics
Wei-Chao Jiang, Manuel Ederer, Stefan Donsa, Johannes Feist, Iva Brezinova, Christoph Lemell, Joachim Burgdoerfer
Summary: In this study, we numerically solve the time-dependent Schrodinger equation for helium to investigate the crucial role of dynamical electron correlations in multiphoton double ionization by ultrashort XUV pulses. We explore the ionization pathways by varying the pulse duration and the number of absorbed photons, finding that the relative importance of correlations depends on these parameters. We identify a pathway involving correlated excitation ionization as an intermediate step in double ionization, which contributes to the yield comparable to the conventional direct sequential double ionization.
Article
Astronomy & Astrophysics
Yang-Ting Chien, A. Deshpande, M. M. Mondal, George Sterman
Summary: We study nonperturbative flavor correlations between pairs of leading and next-to-leading charged hadrons within jets at the Electron-Ion Collider (EIC). We introduce a charge correlation ratio observable r(c) that distinguishes same- and opposite-sign charged pairs, and demonstrate the feasibility of such measurements at the EIC through Monte Carlo simulations. The proposed precision hadronization study will provide new tests of hadronization models and aim to improve quantitative understanding of nonperturbative QCD dynamics.
Article
Physics, Multidisciplinary
H. Jiang, M. Mandrysz, A. Sanchez, J. Dura, T. Steinle, J. S. Prauzner-Bechcicki, J. Zakrzewski, M. Lewenstein, F. He, J. Biegert, M. F. Ciappina
Summary: This study investigates the non-sequential double ionization (NSDI) in argon induced by a 3100 nm laser source through joint experimental and theoretical approaches. The correlated photoelectron momentum distribution (PMD) is found to strongly depend on the pulse duration, which can be explained by an envelope-induced intensity effect. The laser vector potential at the ionization time of the bound electron is influenced by the pulse duration, leading to different drift momenta. This work highlights the significance of pulse duration in NSDI and enhances our understanding of strong field tunnel-recollision dynamics under mid-IR laser fields.
NEW JOURNAL OF PHYSICS
(2023)
Article
Optics
F. C. de Brito, I. G. da Paz, J. B. Araujo, Marcos Sampaio
Summary: This study demonstrates that measuring Gouy phase differences can provide information about changes in entanglement of biphotons in phase space.
Article
Optics
Jingkun Xu, Jintai Liang, Xiaomeng Ma, Kunlong Liu, Yingbin Li, Chuanpeng Cao, Min Li, Benhai Yu, Yueming Zhou, Peixiang Lu
Summary: The nondipole effect in strong-field sequential double ionization of an Ar atom is investigated using a classical ensemble model, and it is found that the magnetic field induces significant displacement of the electron, which affects the electron-ion rescattering.
Article
Chemistry, Physical
Paul Hoerner, Wen Li, H. Bernhard Schlegel
Summary: A new time-dependent configuration interaction method has been developed for simulating strong field sequential double ionization of molecular systems. The process involves simulations of neutral ionization and cation to dication ionization using TD-CIS and TD-CISD-IP methods respectively, with transfer between the two achieved through partitioning ionization rates or singular value decomposition. The population of the cation rises and falls as it is ionized, with ionization continuing for several half cycles depending on pulse shape and field strength. The singular value decomposition of the cation dominates for both orientations considered, with ionization rates peaking when the electric field is aligned with the p(pi) orbital.
JOURNAL OF CHEMICAL PHYSICS
(2021)
Article
Crystallography
Goncalo N. P. Oliveira, Pedro R. Rodrigues, Joao G. Correia, Joao P. E. Araujo, Armandina M. L. Lopes
Summary: In this study, the importance of local distortions in perovskite-like orthochromites for their exhibited properties was investigated through structural and DC magnetisation measurements combined with local probe studies in polycrystalline ErCrO3. The evolution of electric field gradient (EFG) parameters with temperature showed two clear signals of local environment changes, one at the ferroelectric phase transition (T-FE) and the other below 250 K. The observed changes in EFG and the development of a magnetic hyperfine field (MHF) at around 250 K were consistent with the magnetisation measurements, which showed a relatively strong coercive field well above the Cr sub-lattice ordering temperature.
Article
Physics, Multidisciplinary
Ma Kun, Zhu Lin-Fan, Xie Lu-You
Summary: The photoelectron angular distribution in the sequential two-photon double ionization process has been investigated using the multi-configuration Dirac-Fock method and density matrix theory. The study found that the distributions of the first- and second-step electrons in the process are similar and the two photoionization processes affect each other. The results provide valuable information about the electronic structure of atom or molecule systems and shed light on the mechanisms and pathways of two-photon double ionization.
ACTA PHYSICA SINICA
(2022)
Article
Physics, Multidisciplinary
Alex Kovner, Ming Li, Vladimir V. Skokov
Summary: This study investigates correlations originating from the quantum nature of gluons and demonstrates that these could be probed in deep inelastic scattering experiments. The calculations show that the peak observed in dijet production originates from Bose enhancement, and the relative strength of the peak is enhanced with a nuclear target. With future high luminosity electron-ion colliders, measuring gluon Bose enhancement becomes experimentally feasible.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Particles & Fields
Leif Lonnblad, Harsh Shah
Summary: We present the results of our investigation into the angular correlations between baryon pairs in the PYTHIA8 event generator. We examine how color reconnection models and hadronization mechanisms affect these correlations, focusing on the impact of gluons on the baryon production mechanism in the Lund string fragmentation model.
EUROPEAN PHYSICAL JOURNAL C
(2023)
Article
Chemistry, Physical
Dhirendra P. Singh, James O. F. Thompson, Katharine L. Reid, Ivan Powis
Summary: The study conducted photoelectron circular dichroism analysis of S-(+)-fenchone enantiomers using picosecond laser, revealing complex vibronic dynamics of the 3p -> 3s internal conversion and large variations in chiral asymmetry factors.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Physics, Multidisciplinary
Aurel Bulgac, Ibrahim Abdurrahman, Shi Jin, Kyle Godbey, Nicolas Schunck, Ionel Stetcu
Summary: The intrinsic spins and their correlations of fission fragments are poorly understood characteristics from both theoretical and experimental perspectives. Interaction mechanisms and conservation laws control the intrinsic excitation energies along with the intrinsic spins and parities of the fragments, leading to correlations and determining the character of their deexcitation mechanism. Within a fully microscopic framework, new qualitative features have been observed in the fission fragment intrinsic spin distributions, shedding light on debates that have spanned over six decades without definitive conclusions.
PHYSICAL REVIEW LETTERS
(2021)
Article
Multidisciplinary Sciences
Lysander Christakis, Jason S. Rosenberg, Ravin Raj, Sungjae Chi, Alan Morningstar, David A. Huse, Zoe Z. Yan, Waseem S. Bakr
Summary: Synthetic quantum systems with interacting constituents are important for quantum information processing and explaining fundamental phenomena. Ultracold polar molecules offer a promising platform due to their long coherence times and long-range, anisotropic interactions. Using quantum gas microscopy, we study the dynamic correlations of polar molecules in a two-dimensional optical lattice, exploring different interaction scenarios and pushing the frontier of probing and controlling interacting systems of ultracold molecules.
Article
Physics, Multidisciplinary
Pei-Lun He, Karen Z. Hatsagortsyan, Christoph H. Keitel
Summary: We investigate the ion momentum distribution in the x-ray-induced dissociative photoionization of molecules by analyzing the ionization under the Born-Oppenheimer approximation and simulating the ion motion using the Schrodinger equation. The entanglement between the ion and photoelectron transfers information of electronic interference to the ion dynamics, resulting in Young's double-slit interference patterns in the ion momentum distributions of dissociative molecular photoionization. We demonstrate that even when the correlated photoelectron information is lost, double-slit interference signatures still persist in the ion longitudinal momentum shift in the case of heteronuclear molecules.
PHYSICAL REVIEW LETTERS
(2023)
Article
Multidisciplinary Sciences
Gaurav Nirala, Siva T. Pradyumna, Ashok Kumar, Alberto M. Marino
Summary: The ability to encode and transmit information using the temporal and spatial degrees of freedom of quantum states of light is crucial for an efficient quantum network. However, there is still a lack of control required to fully utilize the high dimensionality of the spatial degree of freedom. In this study, we encode information in the spatial correlations of entangled twin beams, taking advantage of their dependence on the angular spectrum of the pump for four-wave mixing. We demonstrate that the encoded information can only be extracted through joint spatial measurements of the twin beams, without modifying the temporal quantum correlations.
Article
Optics
Yonghao Mi, Kyle Johnston, Valentina Shumakova, Soren H. Moller, Kamalesh Jana, Chunmei Zhang, Andre Staudte, Shawn Sederberg, Paul B. Corkum
Summary: Intense laser fields focused in ambient air can generate high-bandwidth current densities, with the amplitude and sign of these currents controlled by adjusting the relative phase. Two-color filamentation in gas targets allows for increasing the energy of terahertz pulses. However, controlling the waveform stability is challenging. By comparing current density detection and terahertz field detection, a clear connection between phase-dependent plasma currents and terahertz radiation is established. Current measurement can be used as a feedback parameter to stabilize the terahertz waveform, providing a route to energetic terahertz pulses with exceptional waveform stability.
PHOTONICS RESEARCH
(2022)
Article
Optics
Ziyue Guo, Kailin Hu, Tao Cao, Shaozhen Liu, Jikun Yan, Zhou Li, Qi Xu, Paul B. Corkum, Jiahui Peng
Summary: This paper reports incubation experiments on ultrashort laser energy deposition and material modification control in dielectrics. A practical incubation model is developed by considering different ionization mechanisms, and a pre-pulse scheme is proposed to limit the absorption volume.
Article
Chemistry, Multidisciplinary
Yonghao Mi, Enliang Wang, Zack Dube, Tian Wang, A. Y. Naumov, D. M. Villeneuve, P. B. Corkum, Andre Staudte
Summary: Using near-infrared, femtosecond laser pulses and coincidence momentum imaging, it is found that the dominant channel after photoionization of a deuterium molecular dimer (D-2-D-2) is the ejection of a deuterium atom within a few hundred femtoseconds, leading to the formation of D-3(+). This pathway of D-3(+) formation from ultracold D-2-D-2 gas may provide insights into the high abundance of H-3(+) in the interstellar medium.
Article
Chemistry, Multidisciplinary
Lianrong Zhou, Hongcheng Ni, Zhejun Jiang, Junjie Qiang, Wenyu Jiang, Wenbin Zhang, Peifen Lu, Jin Wen, Kang Lin, Meifang Zhu, Reinhard Doerner, Jian Wu
Summary: The formation of trihydrogen cation driven by light has been of great interest due to its important role in initiating chemical reactions in interstellar clouds. Previous studies focused on the formation of H-3(+) or D-3(+) from unimolecular reactions, but we observed and characterized the ultrafast formation of D-3(+) from a bimolecular reaction. Molecular dynamics simulations provided an intuitive representation of the reaction dynamics, which matched well with experimental observations. Additionally, we demonstrated control over the emission direction of D-3(+) using a tailored two-colour femtosecond laser field, based on the mechanism known for light control of electron localization in single molecules.
Article
Physics, Multidisciplinary
D. Trabert, N. Anders, A. Geyer, M. Hofmann, M. S. Schoeffler, L. Ph. H. Schmidt, T. Jahnke, M. Kunitski, R. Doerner, S. Eckart
Summary: We experimentally studied the strong-field ionization of the argon dimer in a co-rotating two-color laser field. A subcycle interference pattern in the photoelectron momentum distribution was observed, and the Wigner time delay was inferred using holographic angular streaking of electrons. It was found that the Wigner time delay varied by more than 400 attoseconds with respect to the electron emission direction relative to the molecular axis. The measured time delay was independent of the parity of the dimercation and agreed well with the theoretical model based on the ionization of an aligned atomic p orbital.
PHYSICAL REVIEW RESEARCH
(2023)
Article
Physics, Multidisciplinary
G. Nalin, N. M. Novikovskiy, K. Fehre, N. Anders, D. Trabert, S. Grundmann, M. Kircher, A. Khan, R. Tomar, M. Hofmann, M. Waitz, I. Vela-Perez, G. Kastirke, J. Siebert, D. Tsitsonis, C. Kuestner-Wetekam, L. Marder, J. Viehmann, F. Trinter, H. Fukuzawa, K. Ueda, J. B. Williams, A. Knie, R. Doerner, M. S. Schoeffler, T. Jahnke, Ph. V. Demekhin
Summary: We experimentally and theoretically studied the differential photoelectron circular dichroism (PECD) of O 1s photoelectrons of R-trifluoromethyloxirane enantiomers with different photoelectron kinetic energies. By using cold target recoil ion momentum spectroscopy, we detected the photoelectrons and two ionic molecular fragments simultaneously, enabling determination of the molecule's orientation in the laboratory frame and obtaining molecular-frame photo-electron diffraction patterns for deducing the differential PECD. The observed normalized PECD strength clearly exceeds 50% for given molecular orientations and photoelectron emission directions, consistent with relaxed-core Hartree-Fock calculations using the single center method. These results support our recent discovery of a significant differential PECD in O 1s photoemission of the methyloxirane molecule.
PHYSICAL REVIEW RESEARCH
(2023)
Article
Physics, Multidisciplinary
Andreas Hans, Florian Trinter, Philipp Schmidt, Sebastian Eckart, Sven Grundmann, Gregor Hartmann, Xaver Holzapfel, Carolin Honisch, Gregor Kastirke, Max Kircher, Niklas Melzer, Christian Ozga, Clemens Richter, Jonas Rist, Markus Schoeffler, Daniel Trabert, Isabel Vela-Perez, Johannes H. Viehmann, Miriam Weller, Reinhard Doerner, Uwe Hergenhahn, Arno Ehresmann, Andre Knie, Kirill Gokhberg, Aryya Ghosh, Till Jahnke
Summary: The role of interatomic and intermolecular energy and charge-transfer processes in weakly bound matter is currently debated. Two mechanisms of single-photon two-site double ionization in Ne dimers and clusters are discussed, occurring competitively or subsequently to resonant interatomic Coulombic decay (rICD). The first mechanism is photoelectron-impact ionization, enhanced by resonant excitation. The second mechanism is collisional ionization of energetic Rydberg atoms produced by rICD in Ne clusters and ionized by collisions with neutrals.
PHYSICAL REVIEW RESEARCH
(2023)
Article
Chemistry, Physical
G. Kastirke, F. Ota, D. V. Rezvan, M. S. Schoeffler, M. Weller, J. Rist, R. Boll, N. Anders, T. M. Baumann, S. Eckart, B. Erk, A. De Fanis, K. Fehre, A. Gatton, S. Grundmann, P. Grychtol, A. Hartung, M. Hofmann, M. Ilchen, C. Janke, M. Kircher, M. Kunitski, X. Li, T. Mazza, N. Melzer, J. Montano, V. Music, G. Nalin, Y. Ovcharenko, A. Pier, N. Rennhack, D. E. Rivas, R. Doerner, D. Rolles, A. Rudenko, Ph. Schmidt, J. Siebert, N. Strenger, D. Trabert, I. Vela-Perez, R. Wagner, Th. Weber, J. B. Williams, P. Ziolkowski, L. Ph. H. Schmidt, A. Czasch, Y. Tamura, N. Hara, K. Yamazaki, K. Hatada, F. Trinter, M. Meyer, K. Ueda, Ph. V. Demekhin, T. Jahnke
Summary: XFEL technology enables the study of light-matter interaction under extreme conditions. By analyzing photoelectron angular emission distributions and kinetic energy release of charge states of ionic molecular fragments, a detailed understanding of the charge-up and fragmentation dynamics can be obtained, without the need for complex ab initio modeling.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Chemistry, Physical
Kilian Fehre, Nikolay M. Novikovskiy, Sven Grundmann, Gregor Kastirke, Sebastian Eckart, Florian Trinter, Jonas Rist, Alexander Hartung, Daniel Trabert, Christian Janke, Martin Pitzer, Stefan Zeller, Florian Wiegandt, Miriam Weller, Max Kircher, Giammarco Nalin, Max Hofmann, Lothar Ph H. Schmidt, Andre Knie, Andreas Hans, Ltaief Ben Ltaief, Arno Ehresmann, Robert Berger, Hironobu Fukuzawa, Kiyoshi Ueda, Horst Schmidt-Boecking, Joshua B. Williams, Till Jahnke, Reinhard Doerner, Philipp Demekhin, Markus S. Schoeffler
Summary: X-ray and electron diffraction are powerful tools for determining the structure of molecules, especially in the gas phase. By combining different methods and techniques, we can obtain information about the structure, handedness, and geometry of molecules.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Automation & Control Systems
Sten Gruener, Mario Hoernicke
Summary: Modular plants are a promising option for addressing flexibility, changeability, and interoperability requirements in manufacturing and process industries. However, there are two standards, MTP and PackML, that have conceptual and technical differences, leading to interoperability issues. This research presents an automatic mapping from PackML to MTP to solve this problem.
Article
Optics
Takashi Nakajima, Tasuku Shinoda, D. M. Villeneuve, Hiromichi Niikura
Summary: This study demonstrates the full mapping of the complex wave function of photoelectrons in two-dimensional momentum space using the interference between different optical transition pathways. The detailed structure of the phase and amplitude distributions of photoelectrons can be resolved within the bandwidth determined by the attosecond XUV pulse.
Article
Physics, Atomic, Molecular & Chemical
Sven Grundmann, Florian Trinter, Yong-Kang Fang, Kilian Fehre, Nico Strenger, Andreas Pier, Leon Kaiser, Max Kircher, Liang-You Peng, Till Jahnke, Reinhard Doerner, Markus S. Schoeffler
Summary: We experimentally investigated the quasifree mechanism (QFM) in one-photon double ionization of He and H-2, revealing the four-fold symmetry in the angular emission pattern of QFM electrons from H-2 double ionization and providing evidence that the photon momentum is not imparted onto the center of mass in quasifree photoionization.
Article
Optics
T. Wang, Z. Dube, Y. Mi, G. Vampa, D. M. Villeneuve, P. B. Corkum, Xiaojun Liu, A. Staudte
Summary: In this study, the semiclassical two-step model is used to investigate subcycle interference structures in the photoelectron momentum distribution. The low-momentum region is found to be particularly sensitive to the ion potential, offering another pathway to probe ultrafast electronic structure dynamics.
Article
Optics
Graham G. Brown, Dong Hyuk Ko, Chunmei Zhang, P. B. Corkum
Summary: This study investigates the influence of transition-moment phase on recollision trajectories and uses a model to study all-optical measurements in argon and diatomic molecular systems. The results show that all-optical methods are generally sensitive to the transition-moment phase, but insensitive to the phase shifts caused by two-center interference and ionic structure.
