Article
Optics
Jie Su, Zichao Liu, Jianying Liao, Xuefei Huang, Yingbin Li, Cheng Huang
Summary: The study investigates the nonsequential double ionization of Argon atoms in counter-rotating two-color elliptically polarized fields using a three-dimensional classical model. The results show that as the relative phase between the two elliptical fields increases, the return angle of the electrons decreases and the behavior of the electron pairs shifts from anti-correlation to correlation.
Article
Physics, Multidisciplinary
Wu Wang, Jie Zhou, Boqun Liu, Xu Wang
Summary: A new approach to excite the isomeric Th-229 nuclear state is proposed, using laser-driven electron recollision process which does not require precise knowledge of the energy of the isomeric state. The well timed excitation can be exploited to control the coherence of the isomeric state, with experimental realization within reach using tabletop laser systems.
PHYSICAL REVIEW LETTERS
(2021)
Article
Optics
Yuna Yang, Mingqing Liu, Xiaolei Hao, Jing Chen
Summary: Interference between different returning orbits of the rescattering electron in nonsequential double ionization is investigated, showing a prominent effect in the recollision excitation with subsequent ionization process. However, the oscillation disappears after laser focus averaging due to its rather small period.
Article
Chemistry, Physical
Dan Wu, Qingyi Li, Jun Wang, Fuming Guo, Jigen Chen, Yujun Yang
Summary: The study reveals that the double ionization of hydrogen molecules in high-intensity laser pulses is mainly controlled by sequential double ionization, and the correlation behavior of electron momenta is related to the variation of nuclear distance. The electron momentum correlation depends on the laser pulse's negative vector potential, corresponding to the ionization instants of the two electrons.
CHEMICAL PHYSICS LETTERS
(2021)
Article
Chemistry, Physical
Shuai Zhang, Xincheng Wang, Wenbin Jiang, Yizhu Zhang, Yuhai Jiang, Zhiyuan Zhu
Summary: The photoion-photoion coincidence (PIPICO) method is a simple and effective approach for selecting specific dissociation channels with correlated fragments in molecules. In this study, a new method called charge-encoded multi-photoion coincidence (cMUPICO) is proposed, which takes into account the charge of individual fragments and allows for clear display of coincident channels with fragments of different charge states in dissociation channels.
JOURNAL OF CHEMICAL PHYSICS
(2022)
Article
Optics
Yuxing Bai, Xiaolei Hao, Weidong Li, Weifeng Yang, Jing Chen
Summary: The Coulomb-corrected quantum-trajectories (CCQT) method is developed to describe the recollision-impact ionization (RII) process in nonsequential double ionization of atoms in intense laser field by incorporating the quantum effects and the Coulomb interaction. The results simulated by CCQT show better agreement with experimental results compared to classical-trajectory Monte Carlo (CTMC) and strong-field approximation (SFA) methods. Due to its advantages of low computational cost and back-trajectory analysis, the CCQT method will be an efficient theoretical tool to study the underlying physics of complex and coherent multielectron dynamics in intense laser field.
Article
Physics, Multidisciplinary
Xiao-Meng Ma, Ai-Hong Tong, Zhuo Wang, Chun-Yang Zhai
Summary: The study indicates that, under low intensity laser conditions, the contribution of multiple recollision events in NSDI of Ar increases, and these events occur through doubly excited states.
Article
Optics
Zhangjin Chen, Qiongmin Ding, Qinghua Chen, Shuqi Li, Fang Liu, Huipeng Kang, Toru Morishita, Jing Chen
Summary: We simulated the two-dimensional high-energy photoelectron momentum distributions (PMDs) for high-order above threshold ionization (HATI) in intense elliptically polarized laser fields. By analyzing the center shift of the measured PMDs in elliptically polarized fields, the recollision time can be identified.
Article
Optics
Daniel Younis, Joseph H. Eberly
Summary: This study presents an ab initio analysis of nonsequential strong-field ionization dynamics in a two-electron atom with helium character. Both single-ionization and double-ionization events are characterized and displayed based on detector signals extracted in the two-electron two-dimensional space. The double photoelectron momentum distribution is calculated through coherent path summation over virtual-particle trajectories. A comparison is made between the momentum distributions obtained using the virtual-detector method, the Schrodinger wave function, and the time-dependent surface flux method. Detailed virtual-particle tracking and energy-time readouts provide insights into different ionization and electron recollision pathways. This research demonstrates the application of virtual-detector theory in strong-field multielectron quantum dynamics and emphasizes the importance of the evolving quantum phase in quasiclassical electron propagation.
Article
Engineering, Electrical & Electronic
David K. Ferry
Summary: The semiconductor alloy GaAsSb is commonly found in a variety of semiconductor devices, but little is known about its transport properties. The study theoretically determines the high field transport properties of electrons and holes in the GaAs0.51Sb0.49 alloy, which is widely used in semiconductor devices.
SEMICONDUCTOR SCIENCE AND TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Hamlet K. Avetissian, Garnik F. Mkrtchian, Andreas Knorr
Summary: This study investigates high-order frequency mixing in graphene using a two-color radiation field. The results show that the generation of harmonics from interband transitions is more efficient in the case of an orthogonally polarized two-color field. The generated high harmonics are over two orders of magnitude stronger than those obtained in the parallel polarization case. This is in contrast to atomic and semiconductor systems, where the parallel polarization case is more preferable.
Article
Physics, Multidisciplinary
M. Herve, V Despre, P. Castellanos Nash, V Loriot, A. Boyer, A. Scognamiglio, G. Karras, R. Bredy, E. Constant, A. G. G. M. Tielens, A. Kuleff, F. Lepine
Summary: The study shows the universal role of correlation bands in ultrafast energy relaxation of size-scalable two-dimensional molecules following ionization by an ultrashort XUV pulse. It observed long lifetimes that nonlinearly increase with the number of valence electrons and proposed a general law based on solid-like electron-phonon scattering. This offers new opportunities in attosecond science and high-energy photophysics.
Article
Chemistry, Physical
W. Iskandar, T. N. Rescigno, A. E. Orel, K. A. Larsen, B. Griffin, D. Call, V. Davis, B. Jochim, T. Severt, J. B. Williams, I. Ben-Itzhak, D. S. Slaughter, Th. Weber
Summary: We study the relaxation dynamics of deuterated water molecules through autoionization, resulting in the formation of the rare D+ + O+ + D breakup channel upon absorption of a 61 eV photon. By using the COLd target recoil ion momentum spectroscopy method, we measure the 3D momenta of the ionic fragments and emitted electrons from the dissociating molecule in coincidence. The observed energy distributions of the particles and autoionized electrons provide insights into the super-excited monocationic state and atomic oxygen autoionization processes in D2O.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Optics
E. Marin-Bujedo, M. Genevriez
Summary: This study theoretically investigates the autoionization of core-excited Rydberg states in alkaline-earth-metal atoms. By combining two theoretical methods, accurate autoionization rates are calculated for a wide range of quantum numbers n and l, covering 100 orders of magnitude. The study provides empirical laws and scaling formula for the autoionization of high-l states.
Article
Optics
A. Mueller, M. Martins, A. Borovik, T. Buhr, A. Perry-Sassmannshausen, S. Reinwardt, F. Trinter, S. Schippers, S. Fritzsche, A. S. Kheifets
Summary: The study investigates multiple ionization of the Ar+ ion by a single photon in a specific photon energy range, measuring absolute partial cross sections and observing narrow excitation resonances. High resolution studies on double excitations and comparisons between theoretical and experimental results reveal remarkable agreement with hints of additional ionization mechanisms. The experiment was conducted using the PIPE setup at DESY in Hamburg, supported by theoretical calculations.
Article
Optics
S. L. Haan, Z. S. Smith, K. N. Shomsky, P. W. Plantinga
JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS
(2008)
Article
Optics
S. L. Haan, Z. S. Smith, K. N. Shomsky, P. W. Plantinga
JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS
(2009)
Article
Optics
S. L. Haan, Z. S. Smith, K. N. Shomsky, P. W. Plantinga, T. L. Atallah
Article
Optics
Z. S. Smith, A. Harmon, J. Banister, R. Norman, K. Hoogeboom-Pot, M. Walhout
Article
Optics
S. L. Haan, Z. S. Smith
Article
Optics
K. N. Shomsky, Z. S. Smith, S. L. Haan