Microwave spectroscopy of high-L, n=9 Rydberg levels of nickel: Polarizabilities and moments of the Ni+ ion
Shannon Woods, Chris Smith, Julie Keele, and S. R. Lundeen
Accepted
The complete pattern of Rydberg binding energies of the eighteen n=9 levels of Nickel with L=6, 7, and 8 was measured using the microwave/RESIS technique. The measured pattern is consistent with the form predicted with the effective potential model, showing significant structure proportional to scalar products of tensor operators of order 0-4. The variation of the structure with L separates the various contributing terms and provides determinations of several properties of the Ni+ core ion. These include the quadrupole moment, Q = -0.46978(9) a.u., the hexadecapole moment, = 0.36(5) a.u., the scalar and tensor dipole polarizabilities, D,0 = 7.949(2) a.u., D,2 = 0.905(12) a.u.., the scalar quadrupole polarizability, Q,0 = 55(8) a.u., the g-value, gJ = 1.257(14), and the vector hyperpolarizability, D,1 = 0.454(24) a.u..