26th Australian Institute of Physics Congress and the Australian and New Zealand Conference on Optics and Photonics

Session

AIP ATMOP: Atomic Structure and Fundamental Physics

10 Dec 2026, 14:00

Belinda Hutchinson Building (The University of Sydney )

Conveners

AIP ATMOP: Atomic Structure and Fundamental Physics

• Sascha Hoinka (Swinburne University of Technology)

78. Improved structure calculations in open-shell atoms and applications to EUV lithography

Julian Berengut (University of New South Wales)

10/12/2026, 14:00

AIP | Atomic and Molecular Physics (ATMOP)

Contributed Oral

We present recent theoretical and computational updates to the CI+MBPT method (configuration interaction with many-body perturbation theory) as implemented in AMBiT [1]. The efficiency gains have been orders-of-magnitude and have enabled the complete saturation of CI in large open-shell atoms. Taken with treatment of core-valence correlations using MBPT, we produce the emission spectrum of...

187. Electron-impact excitation of the $^7$LiH $X\,^1\Sigma^+$ vibrational spectrum

Haadi Umer (Curtin University)

10/12/2026, 14:15

AIP | Atomic and Molecular Physics (ATMOP)

Contributed Oral

Liquid metal divertor systems are being developed for magnetic confinement tokamak fusion devices to counteract the damage sustained by typical solid designs due to bombardment from the fusion plasma. Lithium is one of the leading candidate metals for use in these systems. Due to the seeding of lithium into the fusion plasma, LiH molecules form in the edge region. Accurate collision data is...

388. Enhanced Sensitivity to Low-Mass Z′ Bosons in Light Atoms via Parity Nonconservation

Garry Vong (UNSW)

10/12/2026, 14:30

AIP | Atomic and Molecular Physics (ATMOP)

Contributed Oral

Atomic parity nonconservation (PNC) provides a sensitive low-energy probe of electroweak interactions and a pathway to test physics beyond the Standard Model (SM). PNC amplitudes arise from neutral currents mediated by the SM $Z$ boson and may receive additional contributions from hypothetical gauge bosons such as a $Z'$ boson.

For a low-mass $Z'$ boson, its contribution does not scale as...

492. Dual Magnetic and Electric Dipole Symmetry: Pseudo-Angular Momentum in Parity Space and the Electric Land\'e $g$-Factor

Michael Tobar (The University of Western Australia)

10/12/2026, 14:45

AIP | Atomic and Molecular Physics (ATMOP)

Contributed Oral

Electric dipole moments (EDMs) are sensitive probes of fundamental symmetries and central to searches for physics beyond the Standard-Model. We present a symmetry-based, Zeeman-analogue operator framework that places magnetic and electric dipole physics on parallel footing under electromagnetic duality, and introduce a polar-sector pseudo-angular-momentum degree of freedom in parity space...

495. Constraining new electron-electron forces with atomic structure calculations

Cameron West (The University of Queensland)

10/12/2026, 15:00

AIP | Atomic and Molecular Physics (ATMOP)

Contributed Oral

Electron-electron interactions beyond the Standard Model are promising candidates for dark matter and new sources of parity violation. We present a general procedure for extracting new bounds on coupling strengths with atomic structure calculations and do so for certain parity-odd cases. Our approach includes dominant many-body effects and is valid for any parity or mediator mass. Constraints...

574. Nonperturbative treatment of structural radiation in atomic structure

Thakur Giriraj Hiranandani (University of Queensland, Australia)

10/12/2026, 15:15

AIP | Atomic and Molecular Physics (ATMOP)

Contributed Oral

The rise of quantum technologies and low-energy tests of fundamental physics has intensified the demand for precise and reliable calculations of atomic systems. Among the key challenges in this field is the accurate treatment of interactions between bound electrons and external perturbations, such as from the hyperfine interaction and core polarisation. State-of-the-art theoretical approaches...