Abstract
The energy shifts caused by intense laser radiation (108 to 1010 W/cm2) are investigated for several high-lying levels of calcium in order to determine the ac Stark shift of a loosely bound electron in a strong electromagnetic1field. Energy shifts are measured for the closely spaced levels 4s9s 1S0, 4s8d 1D2, 4s10s 1S0, and 3d5s 1D2 by using resonance ionization spectroscopy. The levels associated with Rydberg configurations show the expected ponderomotive energy shifts, but the 3d5s 1D2 shift is approximately half as large as the ponderomotive shifts.
© 1992 Optical Society of America
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