The role of the electronic density of 4f states in metallic lanthanum

Empty4f1-State Magneto-Optical Spectroscopy in LaSe

“…4f transitions in LaSe from our experiment agree well with the theoretical and experimental findings for fcc lanthanum. In fact, in the latter material, the calculated density of empty 4f states shows a peak at 2.7 eV [17] and from the peak observed at 5.5 eV in the BIS spectrum, the position of the empty 4f 1 state is derived to be at 2.6 eV above the Fermi level [18] from an analysis within the framework of a "two electron-one photon transition" assuming a 0.6 eV wide conduction band in fcc lanthanum.…”