Cadmium ions in a natural isotope mixture have been trapped in a linea
r Paul trap and laser cooled. The fluorescence spectra from all even i
sotopes, including the Cd-108(+) isotopes with a natural abundance of
0.89%, were observed. Additionally, we eliminated the heavier isotopes
fi om the trapping region by adjusting the tuning of the laser freque
ncy and by changing the de voltage applied to the end electrodes. (C)
1997 Optical Society of America.