NEW METHOD FOR THERMAL-DESORPTION SPECTROSCOPY USING FIELD ELECTRON-EMISSION MICROSCOPY

We have developed a new method for thermal desorption spectroscopy usi ng field electron emission microscopy. To investigate the validity of our method, we have performed hydrogen adsorption experiments on the w ell known W(100) and W(110) surfaces and also on W(310). The thermal d esorption spectra of these systems show that this method permits the s tudy of adsorption on various single crystal plans of a metal with one sample. This method also gives information about the dipole direction of the adsorbates directly from the thermal desorption spectrum witho ut additional measurement of the work function change induced by adsor bates. (C) 1996 American Institute of Physics.