We confirmed that the uncertainty relation between time and energy is established in fluctuations in the space and time domains that appear when coherent optical pulses propagate through a disordered static medium. The widths of temporal and spectral correlation functions of these fluctuations satisfy the relation ␦␦ϳ1, that is, ␦␦Eϳប. The number of fluctuations is discussed on the basis of the uncertainty relation.
Exposed B156 supericosahedra on a YB66(001) surface
were found align periodically in a two-dimensional square lattice.
On the YB66(001) surface, C60 molecules were deposited at
room temperature. The initial stages of C60 thin-film growth
on the YB66(001) surface were studied using a scanning tunneling
microscope (STM). In the submonolayer regime, the C60
molecule adsorbed strongly on the surface to show the stripe pattern
due to the inner molecule C=C bonds. The adsorbed
layer had no long-range ordering. The C60 molecules did not
favor the on-top site of the B156 supericosahedron. We propose a
model that the C60 molecule adsorbs on triangular sites made up
of the B12 icosahedra on each B156 supericosahedron on the
surface. Due to size frustration, the C60 molecule occupies
only one of two equivalent triangular sites. The model explains
the characteristics of the adsorption site and the arrangement of the
C60 molecules in the submonolayer regime. In the multilayer
regime, the dangling bonds of the surface were passivated by the
first layer, and overlayer growth was governed by van der Waals
interaction between C60 molecules. An island, the top of which
showed a hexagonal lattice, grew on the first layer. The hexagonal
lattice was rotated by 10° with respect to the underlying
square lattice of the YB66(001) surface.
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