Interference method for studies of molecular adsorption at surfaces by second harmonic generation

X. D. Zhu, W. Daum, Xu Dong Xiao, Y. R. Shen

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

As a function of the surface coverage θ, the effective surface nonlinear susceptibility takes the form χs (2) = A + B(θ). The SH signal is proportional to |χs (2)|2. In some cases, information about adsorption can be clearly deduced only if the complex quantities A and B(θ) can be separately determined. A method to obtain A and B(θ) separately was developed and applied to CO on Ni(110). First, |χs (2)|2 was obtained from second-harmonic generation (SHG). Interference between the signal from the sample and that from a crystalline quartz plate was used to suppress A in χs (2), and both the magnitude and phase of B(θ) were measured. The results showed that in all cases B(θ) was not linearly proportional to the CO coverage θ. This is the consequence of the rather complex adsorption kinetics of CO on Ni(110). The SHG measurements were also used to monitor in situ the time development of CO adsorption on Ni(110).

Original languageEnglish (US)
Title of host publicationXVII International Conference on Quantum Electronics. Digest of
Place of PublicationPiscataway, NJ, United States
PublisherPubl by IEEE
StatePublished - 1990
Event17th International Conference on Quantum Electronics - IQEC '90 - Anaheim, CA, USA
Duration: May 21 1990May 25 1990

Other

Other17th International Conference on Quantum Electronics - IQEC '90
CityAnaheim, CA, USA
Period5/21/905/25/90

ASJC Scopus subject areas

  • Engineering(all)

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  • Cite this

    Zhu, X. D., Daum, W., Xiao, X. D., & Shen, Y. R. (1990). Interference method for studies of molecular adsorption at surfaces by second harmonic generation. In XVII International Conference on Quantum Electronics. Digest of Publ by IEEE.