Singly, doubly, triply, and quadruply charged krypton ions are formed by multiphoton absorption processes in krypton atoms. They are induced by a 50-psec laser pulse at 1.064 {μ}m in the 10¹³-10¹⁴-W-cm^-2 intensity range. The percentage ratio between the numbers of doubly and singly ionized Kr atoms is 10% at 8×{}10¹³ W cm^-2. It is shown that Kr²⁺ ions result from a direct 33-photon absorption process. At 1.5×{}10¹³ W cm^-2, the 33-photon absorption rate is only about 60 times less than the 13-photon absorption rate which gives singly charged ions.
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L’Huillier et al. (1982) studied this question.
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