Abstract
The production of multiply charged ions induced by collisionless multiphoton absorption in rare gas atoms has been investigated using an intense 50 p sec laser pulse. Doubly charged ions are produced in helium and neon with a 1064 nm laser pulse in the 1014 - 1015 Wcm-2 range. Up to Ar3+ ions are produced in Ar, Kr4+ ions in Kr and Xe5+ ions in Xe with a 1064nm laser pulse in the 1013 - 1014 Wcm-2 range. The laser intensity dependence of the production of multiply charged ions has been investigated for the five rare gases /1/. At least 146 photons, a value equivalent to 170 eV, have to be absorbed by a Xe atom at 1064 nm to explain the production of Xe5+ ions. The basic absorption mechanism of so many photons by such multi-electron atoms is not yet well understood.
© 1984 Optical Society of America
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