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Double multiphoton ionisation via above-threshold ionisation in strontium atoms

P Agostini and G Petite

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Simple and double ionisation of a strontium atomic beam have been studied with a picosecond dye laser around 565 nm with intensities ranging from 10 to 1000 GW cm-2. Resonances observed on the different ion signals as well as time-of-flight electron energy spectra clearly show that double ionisation is a two-step process which can involve above-threshold ionisation followed by resonant ionisation of the ion.


PACS

32.80.Rm Multiphoton ionization and excitation to highly excited states

Subjects

Atomic and molecular physics

Dates

Issue 10 (28 May 1985)



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