Ground-state properties of Ca2 from narrow line two-color photoassociation
Abstract
By two-color photoassociation of 40Ca four weakly bound vibrational levels in the Ca2 ground state potential were measured, using highly spin-forbidden transitions to intermediate states of the coupled system 3u and 3+ u near the 3P1+1S0 asymptote. From the observed binding energies, including the least bound state, the long range dispersion coefficients C6, C8,C10 and a precise value for the s-wave scattering length of 308.5(50)~a0 were derived. From mass scaling we also calculated the corresponding scattering length for other natural isotopes. From the Autler-Townes splitting of the spectra, the molecular Rabi frequency has been determined as function of the laser intensity for one bound-bound transition. The observed value for the Rabi-frequency is in good agreement with calculated transition moments based on the derived potentials, assuming a dipole moment being independent of internuclear separation for the atomic pair model.
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