Term isotope shift of high lying odd and even energy levels of Nd II

The isotope shifts of the odd and even parity energy levels of singly-ionised neodymium (Nd II) have been evaluated using the measurements carried out in more than 300 spectral lines of Nd II in the region 3290-5820 A. Term shift, Δ T (144Nd-150Nd), is being reported for 23 low even and 15 high lying even parity levels of Nd II. Δ T for a level of 4f36s6p configuration and 8 even levels between 36892 and 43212 cm-1 are being reported for the first time. Δ T values of 151 high lying odd parity levels are being reported and compared with some of the available earlier reported values. Δ T values of 47 odd parity levels are being reported for the first time, most of which are based on our isotope shift studies in UV region. The electronic configuration assignments to energy levels of Nd II byearlier workers are discussed on the basis of present Δ T values. Electronic configurations to some of the unclassified high lying odd levels have been suggested; the levels with Δ T (144-150) between 300 mK and 380 mK are assigned to 4f35d6s configuration whereas a level with Δ T value of 60 mK to 4f46p configuration. (orig.)