  We report on the direct optical production and spectroscopy of
$^1\mathrm{S}_0\mbox{-}^3\mathrm{P}_0$ molecules with large binding energy
using the clock transition of $^{171}\mathrm{Yb}$, and on the observation of
the associated orbital Feshbach resonance near $1300\,\mathrm{G}$. We measure
the magnetic field dependence of the closed-channel dimer and of the
open-channel pair state energy via clock-line spectroscopy in a deep optical
lattice. In addition, we show that the free-to-bound transition into the dimer
can be made first-order insensitive to the trap depth by choice of the lattice
wavelength. Finally, we determine the fundamental intra- and interorbital
scattering lengths and probe the stability of the corresponding pair states,
finding long lifetimes in both interorbital interaction channels. These results
are promising both for molecular clocks and for the preparation of
strongly-interacting multiorbital Fermi gases.
