Thermal desorption study of potassium from K/deuterated Si(100)2 × 1

The shift of the low temperature portion of the potassium desorption spectrum for the K/D/Si(100)2 × 1 caused by the deuterium preadsorption was discussed by thermal desorption spectroscopy (TDS) and metastable deexcitation spectroscopy (MDS) data. When the SiD bonds are formed around the K atom, the K(4s) electrons are localized at the K atom. This localization leads to the reduction in the long range dipolar interaction. This explanation is the most plausible for the shift of the low temperature portion of the potassium desorption spectrum.