The two-and three-photon resonant ionization of Ca has been studied. Calcium atoms in the thermal atomic beam were ionized from the ground 4s 2 1 S 0 state by three-photon absorption. The ion signals exhibited resonances attributed to the two-photon transition 4s 2 1 S 0 -4s6s 1 S 0 and three-photon transitions due to 3d17f, . . . , 3d22f 1 P 1 , 3d19p, . . . , 3d24p 1 P 1 , 3d18f, . . . , 3d19f 3 P 1 and 3d23f, 3d25f 3 D 1 autoionizing states. A simple theoretical model was used to reproduce the main features of the observed spectra due to the two-photon resonant ionization.
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