Abstract
Scanning tunnelling microscopy (STM) has been used to follow the adsorption of tetracene molecules on theSi(100)-2 × 1 surface. Two distinct types of adsorption are indicated by filled state images but threetypes may be distinguished in empty state images. Molecules aligned both along andperpendicular to the silicon dimer rows can be observed. The calculated charge densitiesassociated with occupied and unoccupied orbitals near the Fermi level are compared withthe STM images. Possible bonding arrangements and their correlation with the STMimages are postulated.
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