Molecular beam experiments probing the magnetic and electric deflection are powerful tools for studying the Stark and Zeeman effect of isolated clusters. By combining both experiments, the results not only provide insight into the magnetic and dielectric properties, but can also show a correlation between the Stark and Zeeman effect.
M(120)Sn12 clusters with M = Al, Ga, In have been investigated in electric and magnetic molecular beam deflection experiments at nozzle temperatures of 16 K and 30 K, respectively. Both experiments show two fractions (nonpolar/polar and Brillouin/superatomic) present simultaneously in the molecular beam. In addition, several combined electric and magnetic deflection experimental setups are used to investigate how the superatomic and polar fractions depend on each other. By filtering out one fraction with the first inhomogeneous field, only the remaining fraction is studied in the following deflection experiment. The magnetic beam profiles can be quantitatively simulated based on forbidden crossings in the rotation-Zeeman diagram as a function of rotational constants, vibrational modes, electronic g-factors, and spin-rotation coupling constants. These simulations allow a discrimination of possible structural candidates for the observed superatomic behavior.
The experimentally observed electronic g-factors of g=2.6-2.7 indicate a significant contribution of spin-orbit coupling and could be explained for the first time by a quantum chemical model depending on the global cluster symmetry.
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