Frequency Measurement of the Electric Quadrupole Transition in a Single Laser-Cooled (40)Ca(+)

The optical frequency of the 4s(2)S(1/2)-3d(2)D(5/2) transition in a single trapped and laser-cooled Ca-40(+) ion is measured with an optical frequency comb system referenced to a hydrogen maser. A 729-nm laser can be locked to the clock transition about ten hours and the Allan deviation is better than 2 x 10(-14)/1000s.