https://doi.org/10.1007/s100530170049
Femtosecond ionization of magnesium clusters grown in ultracold helium droplets
Fachbereich Physik, Universität Rostock, 18051 Rostock, Germany
Corresponding author: a tiggesbaeumker@physik.uni-rostock.de
Received:
2
January
2001
Published online: 15 September 2001
Magnesium clusters grown in helium droplets and ionized with
femtosecond laser pulses have been studied by high resolution mass
spectrometry. For moderate laser intensities the abundance spectra show
characteristic features indicating electronic shell effects. Compared to
clusters of s1-electron metals additional shell closures appear
resulting from an electron rearrangement. Irradiation with higher laser
intensities leads to a decomposition of the magnesium clusters into atomic
ions. Due to charge exchange with the surrounding helium matrix mainly
singly and doubly charged magnesium ions remain. In addition, the occurrence
of MgHe
-complexes is observed. Their abundance depends on the shape
of the laser field, i.e. the laser width and the optical delay when
applying the pump-probe
technique.
PACS: 36.40.Cg – Electronic and magnetic properties of clusters / 71.30.+h – Metal-insulator transitions and other electronic transitions
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2001
