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We describe a detailed account of an experiment demonstrating light-induced stabilization against photoionization. The choice of initial state and atom is discussed in relation to the laser wavelength and laser pulse duration. In combination with a 100-fs, 620-nm probe pulse, the optimum choice is the circular 5g state in neon. A picosecond pump laser was used to prepare this Rydberg state. Initially, the population in this state was probed with a nanosecond laser pulse. Subsequently, the nanosecond probe pulse was replaced by an intense, (sub)picosecond pulse and the photoionization signal was studied. When the probe intensity is several times 10¹³ W/cm² a decrease in yield with respect to a less intense pulse with the same fluence is observed, which indicates stabilization. The results are in accordance with recent theoretical predictions.
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Boer et al. (1994) studied this question.
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