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An enhancement of the He^2+ yield near the appearance intensity was not observed by linearly polarized KrF laser light (248 nm), whereas a significant enhancement was observed by linearly polarized Ti: sapphire laser light (745 nm). These results are consistent with the quasistatic model proposed by Corkum Technical Digest of Short Wavelength V: Physics with Intense Laser Pulses (Optical Society of America, Washington, DC, 1993), p. 25.
Kondo et al. (Fri,) studied this question.
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