Non-thermal kinetic-energy distributions of desorbed Na dimers

[摘要] Experiments are reported which demonstrate that Na dimers can be desorbed in a non-thermal reaction if rough Na surfaces are irradiated with pulsed laser light of lambda=355 nm at low laser fluences. This follows from the kinetic-energy distributions of the dimers, which were determined by time-of-flight measurements using a second laser at lambda=248 nm for photoionization. The rate of desorbed dimers can even surmount the rate of detached atoms. Obviously, the dimers constitute highly stable sub-units of the surface which can be released without breaking into individual atoms.

[发布日期] 1997-04-20

[效力级别]  Proceedings Paper

[关键词] alkali metals;clusters;photon stimulated desorption (PSD)