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Magnesium atoms embedded in superfluid helium nanodroplets have beenidentified to arrange themselves in a metastable network, refered to as foam.In order to investigate the ionization dynamics of this unique structure withrespect to a possible light-induced collapse the femtosecond dual-pulsespectroscopy technique is applied. Around zero optical delay a strong featureis obtained which represents a direct probe of the foam response. We found thatupon collapse, ionization is reduced. A particlar intensity ratio of the pulsesallows to address either direct ionization or photoactivation of the neutralcomplexes, thus affecting reaction pathways. A simplified excitation schemevisualizes possible scenarios in accordance with the experimental observations.

Time-resolved studies on the collapse of magnesium atom foam in helium nanodroplets