Elsevier

Surface Science

Volume 167, Issue 1, 1 March 1986, Pages 141-149
Surface Science

Irradiance dependence of photofield emission from tungsten

https://doi.org/10.1016/0039-6028(86)90790-9Get rights and content

Abstract

Measurements of the irradiance dependence of photofield emission from tungsten have been extended to 1.0 GW m−2. The photoyield (the photocurrent per unit irradiance) from the (111) crystal plane is found to be almost independent of irradiance. The (211) and (310) crystal planes are found to exhibit small nonlinearities which are attributed to changes in the work function of the emitting surface caused by laser heating. Even at the highest irradiance, no measurable current of photoelectrons arising from multiphoton excitation is observed.

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