Superelastic electron scattering involving the de-excitation of laser-excited 138 Ba (...6s6p 1 P 1 ) to the lower-lying (...6s5d 1 D 2 ) metastable level has been investigated. These measurements have been used to extract the electron impact coherence parameters which describe excitation out of an isotropic (...6s5d 1 D 2 ) level to the higher-lying (...6s6p 1 P 1 ) state. Studies have been carried out for an electron impact energy of 20 eV and a range of scattering angles up to 45 degrees . This investigation represents a significant extension of coherence parameter measurements to inelastic transitions between excited atomic levels.