A simple model for the f-d transition of actinide and heavy lanthanide ions in crystals
Keywords: 78.55 متر; 78.55.âm; 78.40.Pg; 42.70.âa; 42.62.Fi; 71.20.Eh; f-d transition; The simple model; Lanthanide and actinide ions; VUV spectra; Crystal field;