科研之友
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摘要
We demonstrate the nonlinear optical activity of large Na and K clusters, grown on Au metal film-supported alkane thiol monolayers of different chain lengths. Both the total optical second-harmonic signal intensity as well as its dependence on the angle of incidence depend on the surface coverage with the alkali metal, thus demonstrating the sensitivity of second-harmonic generation to morphological changes in these complex systems. Simultaneously performed extinction and scanning force microscopy measurements under ambient air conditions allow us to obtain independent information on the surface coverage and cluster morphology. The latter measurements also show that the optical activity of sodium clusters grown on alkane thiols at 150 K and annealed to 300 K is conserved on dosing with oxygen.
- 出版日期2001-6
