Frequency Comb Assisted Spectroscopy of the States \(X^1\Sigma _g^+\) , \((1)0_u^+\) , and \((1)1_u\)

In this chapter, I describe highly precise one- and two-photon laser spectroscopy of the rovibronic levels of diatomic strontium. In particular, the full vibrational ladder of the ground potential is resolved across its entire depth. I detail how the spectroscopy is aided by the state-of-the-art metrological apparatus, namely a frequency comb that is phase-referenced to an ultranarrow, cavity-stabilized laser. I also discuss quantum chemistry calculations by our collaborators, who constructed refined models for the ungerade, relativistic excited potentials asymptoting to the atomic intercombination line. A quantum mechanical model of the excitation dynamics and laser-induced spectroscopic features is given using the Lindblad master equation.