Molecules of [121]tetramantane in flat arrangement on gold
have been investigated by scanning tunneling microscopy and
spectroscopy [20], and the results were compared with density
functional computations [20–22]. From these measurements and
computations, the energy gap between the highest occupied and
the lowest unoccupied molecular orbitals (HOMO and LUMO,
respectively) of tetramantane was estimated to be much larger
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