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Multiphoton single and double ionization of magnesium was studied by measuring electron energy spectra and ion mass spectra using 1-ps laser pulses in the 580–595-nm wavelength and 10 12 – 10 13 -W/ cm 2 intensity range. In single ionization the (3 p ) 2 1 S doubly excited autoionizing state, resonant at the four-photon level, is found to play an important role. Single ionization leaving the Mg + ion in the 3 p excited state is strongly enhanced when resonant with the (3 p ) 2 1 S state. The amount of above threshold ionization observation also varies strongly in the wavelength range under study. At an intensity of 2× 10 13 W/ cm 2 , sequential double ionization is found to occur dominantly via the excited ionic state Mg + (3 p ). The first ionization step populates this state less than the ion ground state Mg + (3 s ), but this is compensated by the lower order of the second ionization step.
Physical Review A – American Physical Society (APS)
Published: Aug 1, 1994
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