Article history: We report on an experimental veriﬁcation that emission properties of photocathodes can be manipulated Received 31 August 2015 through the engineering of the surface electronic structure. Ultrathin multilayered MgO/Ag(0 0 1)/MgO Received in revised form 22 October 2015 ﬁlms were grown by pulsed laser deposition, tuning the thickness n of the ﬂanking MgO layers to 0, 2, 3, Accepted 6 November 2015 and 4 monolayers. We observed an increase in quantum efﬁciency and simultaneous decrease in work Available online 12 November 2015 function with layer thickness. The scale and trend direction of measurements are in good but not excellent agreement with theory. Angle resolved photoemission data for the multilayered sample n = 3 showed that Keywords: the emission proﬁle has a metallic-like momentum dispersion. Deviations from theoretical predictions Pulsed laser deposition [K. Németh et al., PRL 104, 046801 (2010)] are attributed to imperfections of real surfaces in contrast with RHEED the ideal surfaces of the calculation. Photoemissive properties of cathodes are critical for electron beam Epitaxy applications such as photoinjectors for Free Electron Lasers (FEL) and Energy Recovery Linacs (ERL). An Photocathode Work function ideal photoemitter has a high quantum efﬁciency, low work function, low intrinsic emittance
Applied Surface Science – Elsevier
Published: Jan 1, 2016
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