Line shapes of optical Feshbach resonances near the intercombination transition of bosonic Ytterbium

TL;DR

This paper theoretically analyzes how optical Feshbach resonance shapes in bosonic Ytterbium are influenced by isotope mass tuning, revealing the relationship between scattering length and shape resonances in low-temperature photoassociation spectra.

Contribution

It introduces a mass-scaled model of the excited state potential that accurately describes experimental data across Ytterbium isotopes, highlighting isotope-dependent spectral differences.

Findings

Shape of photoassociation spectra varies with isotope.

Scattering length influences the occurrence of shape resonances.

Mass tuning affects the rotational components of Feshbach resonances.

Abstract

The properties of bosonic Ytterbium photoassociation spectra near the intercombination transition $^{1}S_{0}$--$^{3}P_{1}$ are studied theoretically at ultra low temperatures. We demonstrate how the shapes and intensities of rotational components of optical Feshbach resonances are affected by mass tuning of the scattering properties of the two colliding ground state atoms. Particular attention is given to the relationship between the magnitude of the scattering length and the occurrence of shape resonances in higher partial waves of the van der Waals system. We develop a mass scaled model of the excited state potential that represents the experimental data for different isotopes. The shape of the rotational photoassociation spectrum for various bosonic Yb isotopes can be qualitatively different.