NEW DESORPTION STATE OF D-2 FROM DEUTERIUM-TERMINATED SI(100) BY POTASSIUM ADSORPTION

Metastable deexcitation spectroscopy (MDS) and thermal desorption spec troscopy (TDS) were used to investigate how potassium adsorption affec ts deuterium binding to a Si(100) surface, Upon depositing potassium a toms on the deuteride silicon, some of the preadsorbed deuterium atoms bound to the Si-dangling bonds break the bonds to produce K+-D- bonds with its D- end toward the vacuum. The new D-2 desorption peak relate d to the K-D bonds was found at 140 degrees C, which was supported by MDS and work function experiments.