  Supplementing our STM and electron emission studies investigations,
concluding in electron pairing in strong laser fields [1], further
time-of-flight electron emission studies were carried out, changing the angle
of polarization of the incident light, exciting surface plasmon oscillations.
It has been found, that those parts of the electron spectrum which have been
attributed to electron pairing have a significantly different angular
dependence around 80 GW/cm2 where the pairing effect has been found than
outside this region (e.g. 120 GW/cm2). These results have been interpreted as
the appearance of ideal or partly ideal diamagnetism on the one hand and as
anomaly in the magneto-optical effect (rotation) on the other, in the same
laser intensity region where the pairing effect has been found.
