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Development of parallel relativistic atomic codes for accurate treatment of complex systems

ORAL

Abstract

There has been an increasing need for high quality high-precision atomic data and software for studies of fundamental interactions, development of atomic clocks and other ultracold atom experiments, astrophysics, plasma science, precision measurements, and many others. We have developed new parallel atomic structure codes that enable accurate computations that were not possible before due to system complexity and allow much quicker computations with higher accuracy for simpler systems. Our new parallel codes have achieved near-perfect linear scalability with very high efficiency for calculations done so far. Applications of new code package to predict properties of a wide range of systems, from negative to highly-charged ions, will be reported. The new codes will also be used to produce large volumes of atomic data for a new online portal being developed at the University of Delaware.

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Publication: Observation of an electric quadrupole transition in a negative ion: Experiment and Theory, C.W. Walter, S. E. Spielman, R. Ponce, N. D. Gibson, J. N. Yukich, C. Cheung, M. S. Safronova, Phys. Rev. Lett. 126, 083001 (2020).<br><br>Predicting quasibound states of negative ions: La$^-$ as a test case, M. S. Safronova, C. Cheung, M. G. Kozlov, S.E. Spielman, N. D. Gibson, C. W. Walter, Phys. Rev. A 103, 022819 (2021).<br><br>Detection of the Lowest-Lying Odd-Parity Atomic Levels in Actinium, Ke Zhang, Dominik Studer, Felix Weber, Vadim M. Gadelshin, Nina Kneip, Sebastian Raeder, Dmitry Budker, Klaus Wendt, Tom Kieck, Sergey G. Porsev, Charles Cheung, Marianna S. Safronova, Mikhail G. Kozlov, Phys. Rev. Lett. 125, 073001 (2020).<br><br>Optical clocks based on the Cf\,$^{15+}$ and Cf\,$^{17+}$ ions, S. G. Porsev, U. I. Safronova, M. S. Safronova, P. O. Schmidt, A. I. Bondarev, M. G. Kozlov, I. I. Tupitsyn, C. Cheung, Phys. Rev. A 102, 012802 (2020).<br><br>High-resolution photo-excitation measurements exacerbate the long-standing Fe XVII emission problem, Steffen K\"uhn, et al., Phys. Rev. Lett. 124, 225001 (2020).<br><br>Accurate prediction of clock transitions in a highly charged ion with complex electronic structure, C. Cheung, M. S. Safronova, S. G. Porsev, M. G. Kozlov, I. I. Tupitsyn, A. I. Bondarev, Phys. Rev. Lett. 124, 163001 (2020).

Presenters

  • Charles Cheung

    University of Delaware

Authors

  • Charles Cheung

    University of Delaware

  • Marianna S Safronova

    University of Delaware

  • Sergey G Porsev

    University of Delaware, Petersburg Nuclear Physics Institute of NRC "Kurchatov Institute"

  • Mikhail Kozlov

    Petersburg Nuclear Physics Institute of NRC "Kurchatov Institute", St. Petersburg Electrotechnical University "LETI"