WAVEFUCTIONS FOR CONFIGURATION 4F2 5D6S2 OF PRASEODYIMUM (PR I) TO CALCULATE ENERGY AND OTHER SPECTROSCPIC QUANTITIES.

Term symbols are used to label characteristics of atomic and ionic levels. The information we extract from term symbols are spin multiplicity, orbital and total angular momentum for different electronic states of atoms as well as its ions. wave function can be written as a linear combination of the pure parentage wave functions for the specific terms having same total orbital angular momentum L and total spin angular momentum S. These wavefunctions are important to calculate because several spectroscopic quantities e.g. energy, transition probability etc. can be calculated with the help of these wavefunctions. In this study the 42 electronic terms of configurations, 102 the possible electronic state and 23 coupled wavefunctions of the terms of 4f^2 5d6s^2configuration of Pr I, with seven parents (1S, 1D, 1G, 1I, 3P, 3F, 3H) belonging to f^2 are reported.