OPTICAL 2ND-HARMONIC GENERATION STUDY OF BARIUM DEPOSITION ON SI(001)

Experimental results are presented on the deposition of barium on clean Si (001) studied by optical second-harmonic generation and work function measurements. Barium deposition up to one monolayer coverage enhances the signals by nearly a factor of 10. Continued deposition of Ba leaves the signal arising from the in-plane polarization component unaffected, indicating that this signal arises from the Si-Ba interface or the Ba-vacuum interface. In contrast, the second-harmonic signals related to the normal polarization components are increased by another order of magnitude around ~ 4 ML Ba coverage. © 1990, American Vacuum Society. All rights reserved.