CRYSTAL FIELD AND ELECTRONIC RELAXATION EFFECTS IN Rb2NaYbF6 B.D. DUNLAP, G.R. DAVIDSON, M. EIBSCHÜTZ, H.J. GUGGENHEIM et R.C. SHERWOOD J. Phys. Colloques, 35 C6 (1974) C6-429-C6-431 DOI: 10.1051/jphyscol:1974685