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

Session

AIP ATMOP: Atomic/Molecular Structure and Dynamics

ATMOP

8 Dec 2026, 11:00

Belinda Hutchinson Building (The University of Sydney )

Conveners

AIP ATMOP: Atomic/Molecular Structure and Dynamics

• Julian Berengut (University of New South Wales)

159. Development of novel relativistic multireference coupled cluster approaches for complex quasi-degenerate electronic structures.

Ephraim Eliav (Tel Aviv University)

08/12/2026, 11:00

AIP | Atomic and Molecular Physics (ATMOP)

Invited talk

The relativistic Fock-space coupled cluster (FS-RCC) method is among the most powerful and elegant multireference tools for the ab initio treatment of open-shell heavy element systems. Yet in its standard valence-universal form, it is largely confined to low Fock-space sectors, and its reach into genuinely multivalence, quasi-degenerate structures is limited by intruder states, and by the...

141. Revisiting the Great Hydrogen Controversy

Dr Liam Scarlett (Curtin University)

08/12/2026, 11:30

AIP | Atomic and Molecular Physics (ATMOP)

Contributed Oral

The vibrational excitation of molecular hydrogen (H$_2$) by low-energy electrons is one of the most fundamental reactions in atomic and molecular physics, playing a key role in the chemistry of the interstellar medium and studies of fusion plasmas. Crossed-beam experiments and electron swarm measurements have long been used to determine scattering cross sections for vibrational excitation, but...

634. Re-examining the hyperfine structure of ThO

Shannon Ray (University of Queensland)

08/12/2026, 11:45

AIP | Atomic and Molecular Physics (ATMOP)

Contributed Oral

Searches for Beyond Standard Model physics in molecular systems have become an increasingly active area of research in recent decades. CP-violating interactions and hyperfine parameters are both sensitive to the behaviour of the electronic wavefunction in the nuclear region. Consequently, precise measurements and accurate calculations of molecular hyperfine structure provide an important...

734. Relativistic all-orders calculations in atomic physics

Andoni Skoufris (The University of Queensland)

08/12/2026, 12:00

AIP | Atomic and Molecular Physics (ATMOP)

Contributed Oral

The high-precision study of atomic systems can be applied in many practical and theoretical settings, from the development of state-of-the-art atomic and nuclear clocks to fundamental tests of the Standard Model (SM). Tests of the SM, in particular, are typically strongest in heavy and relativistic atomic systems where very weak, parity-violating effects described by the SM or extensions...

788. Watching a molecular bond break

Dr Nida Haram (Joint Attosecond Science Lab, National Research Council and University of Ottawa, ON K1A 0R6, Canada)

08/12/2026, 12:15

AIP | Atomic and Molecular Physics (ATMOP)

Contributed Oral

Polarization and correlation effects in molecular photodynamics are intimately tied to the coupled motion of electrons and nuclei. Understanding these interactions on their natural femtosecond timescales requires measurements that resolve both electronic structure and nuclear configuration simultaneously. Here, we present a complete imaging study of the UV-initiated dissociation of...