Abstract
Through numerical simulations in the density- matrix and amplitude formalisms, we study the isomer se- lectivity of a double- and triple-resonance ionization scheme of niobium (Nb). The energy-level model comprises three or four hyperfine doublets with the magnetic substates in- corporated. The model parameters (hyperfine splittings, level decay rates) are chosen to imitate accurately a particular ex- citation scheme of Nb. The doublets are coupled by pulsed multimode fields. The field fluctuations are modeled through random, abrupt jumps in the values of the field parame- ters (phases, amplitudes, frequencies). The isomer selectiv- ity is computed in different noise scenarios, and the effect of small ( 300 MHz) isotope shifts on the selectivity is studied.
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