Abstract
As a continuation of a preceding study, the possibility of bunched beam release from a FEBIAD-B2 ion source was investigated for the alkali metals, the alkaline-earths, aluminum, the transition elements scandium to nickel and for ytterbium. With an appropriate choice of the cooling/heating system and of the trap material, efficient bunching is reached for the alkalies, calcium, manganese and ytterbium, which have enthalpies of adsorption within the range 2.6 ≤ Δ H a < 5 eV, the window useful for bunching. Utilizing deduced values of the mean sticking time at a surface of defined temperature, Δ H a-values up to approximately 6 eV can be determined. Thus the conditions can be specified which should allow bunching and chemical separation for various other elements that are too refractory for the present device. Experimental and semi-empirical Δ H a-values are in good agreement for the transition elements and aluminum but exhibit strong deviations for the alkali metals, the alkaline-earths, ytterbium and probably some other lanthanides. On-line mass separation of neutron-deficient isotopes of cadmium, indium and tin with a high degree of selectivity demonstrates the chemical separation power of bunched beam release.
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