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We report the binding energy of $^{87}$Rb$^{133}$Cs molecules in theirrovibrational ground state measured using an offset-free optical frequency combbased on difference frequency generation technology. We create molecules in theabsolute ground state using stimulated Raman adiabatic passage (STIRAP) with atransfer efficiency of 88\%. By measuring the absolute frequencies of ourSTIRAP lasers, we find the energy-level difference from an initial weakly-boundFeshbach state to the rovibrational ground state with a resolution of 5 kHzover an energy-level difference of more than 114 THz; this lets us discern thehyperfine splitting of the ground state. Combined with theoretical models ofthe Feshbach state binding energies and ground-state hyperfine structure, wedetermine a zero-field binding energy of $h\times114\,268\,135\,237(5)(50)$kHz. To our knowledge, this is the most accurate determination to date of thedissociation energy of a molecule.

Measurement of the binding energy of ultracold $^{87}$Rb$^{133}$Cs molecules using an offset-free optical frequency comb