Two- and three-photon resonant ionisation of strontium: energy and angular distribution of the electrons

Ionisation spectra of strontium have been measured using tunable laser radiation between 555 and 577 nm. The influence of bound two-photon resonances and autoionising three-photon resonances on the energy spectra and the angular distribution of the photoelectrons is studied for selected wavelengths. Four-photon ionisation via three-photon autoionising resonances is observed.

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