Crystal field parameters for the pentaphosphates of neodymium and europium

Previously reported spectra of the pentaphosphates of neodymium and europium are analyzed by diagonalizing a parametrized Cs(C1h) Hamiltonian in free-ion bases involving the 5 and 7 lowest J multiplets, respectivly, of each ion. By reassigning symmetries to the reported Eu levels according to predictions from scaled crystal field parameters that fit 28 Nd levels to 7.61 cm−1, a fit of 10.43 cm−1 to 46 levels of Eu was obtained. Predicted crystal field parameters for all the lanthanide pentaphosphates are given.