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The element of the first series that is from Cerium to Lutetium ( 58Ce to 71 Lu), which form a part of the sixth period are called lanthanides. These fourteen elements form 4f inner transition series. They are heavy metals. Their Laser properties were demonstrated in early sixties by Whan and Crossby. In this study two rareearth Neodymium and Erbium have been taken. Due to electrostatic and magnetic interactions, there exist energy levels associated with rare-earth element. The energy levels of these elements can be expressed in terms of four parameters (F2,F4,F6) and Landes parameter. By taking their spectra, we know position of energy levels. Both Neodymium and Erbium complexes are studied in solvent form. Ten peaks are observed for Neodymium and eight peaks are observed for Erbium in visible region. Due to complexation some of the absorption bands are modified and become more intense. These bands are due to hypersensitive transitions known as hypersensitive bands. Occurrence of these bands is explained by Judd. Key-Words: Neodymium, Erbium, Alanine, Urea and hypersensitive transitions Date of Submission: 10-11-2018 Date of acceptance: 25-11-2018

A Study of Covalency of Erbium and Neodymium Ternary Complexes in Alanine and Urea