SCANNING TUNNELING MICROSCOPY STUDY OF ALKALI METAL ADSORPTION ON THE Si (001) 2x1 SURFACE Y. HASEGAWA, T. HASHIZUME, I. KAMIYA, T. IDE, I. SUMITA, S. HYODO, T. SAKURAI, H. TOCHIHARA, M. KUBOTA and Y. MURATA J. Phys. Colloques, 50 C8 (1989) C8-229-C8-234 DOI: 10.1051/jphyscol:1989839