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We studied the ionization probability of Na atoms in an intense Ti-sapphire laser at 800 nm versus the laser pulse duration. The ionization probabilities for the Na(3s) and Na(3p) states were found to vary non-monotonically with the pulse duration at a constant peak laser intensity. The abnormal (non-monotonic) pulse duration dependence was traced to the competition between resonant and non-resonant multiphoton ionization processes, which occurs when the frequency broadening due to the finitedoi:10.1088/0953-4075/36/6/304 fatcat:4c6vubja3fenvigbl3swrat7ny