Skip to main content
18–23 Jun 2023
University of New Brunswick
America/Halifax timezone
Welcome to the 2023 CAP Congress Program website! / Bienvenue au siteweb du programme du Congrès de l'ACP 2023!

High precision theory for the Rydberg states of helium up to n = 24

21 Jun 2023, 13:45
15m
UNB Tilley Hall (Rm. 5 (max. 70))

UNB Tilley Hall

Rm. 5 (max. 70)

Oral not-in-competition (Graduate Student) / Orale non-compétitive (Étudiant(e) du 2e ou 3e cycle) Atomic, Molecular and Optical Physics, Canada / Physique atomique, moléculaire et photonique, Canada (DAMOPC-DPAMPC) (DAMOPC) W2-2 DAMPOC I | DPAMPC I (DPAMPC)

Speaker

Gordon Drake (University of Windsor)

Description

There is a 10σ discrepancy between theory and experiment for the ionization energy of the 1s2s3S1 state of helium [1]. In order to provide an additional check, Clausen et al. [2] have performed measurements for the Rydberg P-states of helium from n=24 to n=100 and extrapolated to n= to find the ionization energy. In the present work, we extend previous high-precision variational calculations [3] up to n=24 using triple basis sets in Hylleraas coordinates. With the inclusion of relativistic and QED corrections, the results provide a direct theoretical test against the Clausen measurement at n=24. The results are in excellent agreement, thereby confirming the 10σ discrepancy between theory and experiment for the ionization energy of the 1s2s3S1 state of helium.

[1] V. Patkos, V. A. Yerokhin and K. Pachucki, Phys. Rev. A 103, 042809 (2021).

[2] G. Clausen et al. Phys. Rev. Lett. 127, 093001 (2021).

[3] G. W. F. Drake, M. M. Cassar and R. A. Nistor, Phys. Rev. A, 65, 054501 (2002).

Keyword-1 High-precision theory
Keyword-2 Rydberg states in helium

Authors

Aaron Bondy Mr Evan Petrimoulx (University of Windsor) Gordon Drake (University of Windsor) Mrs Lamies Sati (University of Windsor)

Presentation materials

There are no materials yet.