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• W2023006092 abstract "Single and double ionization of ground state $mathrm{Mg}$ atoms is observed in an atomic beam experiment in the $584--596phantom{rule{0.3em}{0ex}}mathrm{nm}$ spectral range with a maximum intensity of $9ifmmodetimeselsetexttimesfi{}{10}^{11}phantom{rule{0.3em}{0ex}}mathrm{W}∕{mathrm{cm}}^{2}$ and pulses of ns duration. The ${mathrm{Mg}}^{+}$ spectrum consists of a single broad resonance whose position is very sensitive to laser intensity and it is attributed to the four-photon excitation of the doubly excited $3{p}^{2}phantom{rule{0.3em}{0ex}}^{1}S_{0}$ state. For intensities higher than $2ifmmodetimeselsetexttimesfi{}{10}^{11}phantom{rule{0.3em}{0ex}}mathrm{W}∕{mathrm{cm}}^{2}$ a considerable double ionization yield is obtained. The ${mathrm{Mg}}^{2+}$ spectra are composed of two lobes, each one dominating at different intensities. These observations can be interpreted by a sequential mechanism in which doubly charged ions are created by multiphoton resonant ionization of the excited $3{p}_{1∕2,3∕2}$ ${mathrm{Mg}}^{+}$ states (with negligible contribution from the $3{s}_{1∕2}$ ionic ground state) after the single ion production has saturated. The population of these excited ionic states suggests the absorption of two photons above the first ionization threshold of $mathrm{Mg}$. This interpretation is unambiguously confirmed by a complementary fluorescence experiment. Moreover, both ionization and fluorescence spectra as well as ionization yields are very well reproduced by a theoretical model based on a combination of density matrix and rate equations, taking into account the near-resonant coupling between the $3{p}^{2}phantom{rule{0.3em}{0ex}}^{1}S_{0}$ and $3p3dphantom{rule{0.3em}{0ex}}^{1}P_{1}$ autoionizing states and employing calculated parameters for both $mathrm{Mg}$ and ${mathrm{Mg}}^{+}$. It is thus pointed out that for visible ns pulses of moderate intensity the autoionizing resonances play a crucial role in the multiphoton sequential double ionization of alkaline-earth-metal atoms." @default.
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• W2023006092 date "2004-09-10" @default.
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• W2023006092 title "Single and double ionization of magnesium via four-photon excitation of the3p2S01autoionizing state: Experimental and theoretical analysis" @default.
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• W2023006092 doi "https://doi.org/10.1103/physreva.70.033403" @default.
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