Vibrational constants and binding energies of Sr+Xe

The optical absorption spectrum of Sr+Xe, is measured in the 21 500–23 300 cm−1 energy region, using photofragmentation spectroscopy of mass-selected ions. The spectrum consists of two vibrational progressions that are due to dipole transitions from the X2Σ1/2 electronic ground state to vibrational levels of the excited A2Π1/2 and A2Π3/2 states. From isotope-resolved measurements and using the approximation of the anharmonic oscillator, we calculated the vibrational constants for the ground X2Σ1/2 and the excited A2Π1/2, A2Π3/2 states. Finally, we estimate the binding energies of the involved states with the aim of an electrostatic potential model.