Publications

  1. pCI: A parallel configuration interaction software package for high-precision atomic structure calculations, Charles Cheung, Mikhail G. Kozlov, Sergey G. Porsev, Marianna S. Safronova, Ilya I. Tupitsyn, Andrey I. Bondarev, Computer Physics Communications 308, 109463 (2025).
  2. Neural-network approach to running high-precision atomic computations, Pavlo Bilous, Charles Cheung, and Marianna Safronova, Phys. Rev. A 110, 042818 (2024).
  3. Pr10+ as a candidate for a high-accuracy optical clock for tests of fundamental physics, S. G. Porsev, C. Cheung, M. S. Safronova, H. Bekker, N.-H. Rehbehn, J. R. Crespo López-Urrutia, and S. M. Brewer, Phys. Rev. A 110, 042823 (2024).
  4. Prospects of a thousand-ion Sn2+ Coulomb-crystal clock with sub-10-19 inaccuracy, David R. Leibrandt, Sergey G. Porsev, Charles Cheung, and Marianna S. Safronova, Nature Communications 15, 5663 (2024).
  5. High-Precision Transition Energy Measurements of Neon-like Fe XVII Ions, Chintan Shah, Moto Togawa, Marc Botz, Jonas Danisch, Joschka J. Goes, Sonja Bernitt, Marleen Maxton, Kai Köbnick, Jen Buck, Jörn Seltmann, Moritz Hoesch, Ming Feng Gu, F. Scott Porter, Thomas Pfeifer, Maurice A. Leutenegger, Charles Cheung, Marianna S. Safronova, José R. Crespo López-Urrutia, ApJ 969 52 (2024).
  6. Lifetime-Limited Linewidth Measurements of the 3C and 3D Soft X-ray Transitions in Ni XIX, Chintan Shah, Steffen Kühn, Sonja Bernitt, René Steinbrügge, Moto Togawa, Lukas Berger, Jens Buck, Moritz Hoesch, Jörn Seltmann, Mikhail G. Kozlov, Sergey G. Porsev, Ming Feng Gu, F. Scott Porter, Thomas Pfeifer, Maurice A. Leutenegger, Charles Cheung, Marianna S. Safronova, and José R. Crespo López-Urrutia, Phys. Rev. A 109, 063108 (2024).
  7. State-Insensitive Trapping of Alkaline-Earth Atoms in a Nanofiber-Based Optical Dipole Trap, K. Ton, G. Kestler, D. Filin, C. Cheung, P. Schneeweiss, T. Hoinkes, J. Volz, M. S. Safronova, A. Rauschenbeutel, and J. T. Barreiro, PRX Quantum 4, 040308 (2023).
  8. Calculations of multipole transitions in Sn II for kilonova analysis, Andrey I. Bondarev, James Gillanders, Charles Cheung, Marianna S. Safronova, and Stephan Fritzsche, Eur. Phys. J. D 77, 126 (2023).
  9. Optical telecommunications-band clock based on neutral titanium atoms, Scott Eustice, Dmytro Filin, Jackson Schrott, Sergey Porsev, Charles Cheung, Diego Novoa, Dan M. Stamper-Kurn, and Marianna S. Safronova, Phys. Rev. A 107, L051102 (2023).
  10. Calculation of energies and hyperfine structure constants of 233U+ and 233U, S. G. Porsev, C. Cheung, and M. S. Safronova, Phys. Rev. A 106, 042810 (2022).
  11. New Measurement Resolves Key Astrophysical Fe XVII Oscillator Strength Problem, Steffen Kuhn, Charles Cheung, Natalia S. Oreshkina, René Steinbrügge, Moto Togawa, Sonja Bernitt, Lukas Berger, Jens Buck, Moritz Hoesch, Jörn Seltmann, Florian Trinter, Christoph H. Keitel, Mikhail G. Kozlov, Sergey G. Porsev, Ming Feng Gu, F. Scott Porter, Thomas Pfeifer, Maurice A. Leutenegger, Zoltán Harman, Marianna S. Safronova, José R. Crespo López-Urrutia, and Chintan Shah, Phys. Rev. Lett. 129, 245001 (2022).
  12. Laser spectroscopy of the y 7PJo states of Cr I, E. B. Norrgard, D. S. Barker, S. P. Eckel, S. G. Porsev, C. Cheung, M. G. Kozlov, I. I. Tupitsyn, and M. S. Safronova, Phys. Rev. A 105, 032812 (2022).
  13. Low-lying energy levels of 229Th35+ and the electronic bridge process, S. G. Porsev, C. Cheung and M. S. Safronova, Quantum Science and Technology 6, 034014 (2021).
  14. Scalable Codes for Precision Calculations of Properties of Complex Atomic Systems, Charles Cheung, Marianna Safronova and Sergey Porsev, Symmetry 13(4), 621 (2021).
  15. 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 (2021).
  16. 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).
  17. 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).
  18. Optical clocks based on the Cf15+ and Cf17+ 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).
  19. High-resolution photo-excitation measurements exacerbate the long-standing Fe XVII emission problem, Steffen Kuhn, Chintan Shah, José R. Crespo López-Urrutia, Keisuke Fujii, René Steinbrügge, Jakob Stierhof, Moto Togawa, Zoltán Harman, Natalia S.Oreshkina, Charles Cheung, Mikhail G. Kozlov, Sergey G. Porsev, Marianna S. Safronova, Julian C. Berengut, Michael Rosner, Matthias Bissinger, Ralf Ballhausen, Natalie Hell, SungNam Park, Moses Chung, Moritz Hoesch, Jörn Seltmann, Andrey S. Surzhykov, Vladimir A. Yerokhin, Jörn Wilms, F. Scott Porter, Thomas Stöhlker, Christoph H. Keitel, Thomas Pfeifer, Gregory V. Brown, Maurice A. Leutenegger, Sven Bernitt, Phys. Rev. Lett. 124, 225001 (2020).
  20. 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).