Configuration mixing of the level (23 537)o9/2in Nd II deduced from the optical isotope shifts by collinear fast-ion-beam laser spectroscopy

The optical isotope shifts in the transition 4f4 5d 6 K9/2 -(23 537)9/2 0 (5702 A) of Nd II by collinear fast-ion-beam laser spectroscopy have been used to deduce for the first time that the mixing probabilities of the configurations 4f3 5d2 , 4f4 6p and 4f3 5d6s of the level (23 537)9/2 0 are 0.84, 0.15 and 0.01 respectively.