Thermal limit to the intrinsic emittance from metal photocathodes

Jun Feng, J. Nasiatka, Weishi Wan, Siddharth Karkare, John Smedley, Howard A. Padmore

Research output: Contribution to journalArticlepeer-review

38 Scopus citations


Measurements of the intrinsic emittance and transverse momentum distributions obtained from a metal (antimony thin film) photocathode near and below the photoemission threshold are presented. Measurements show that the intrinsic emittance is limited by the lattice temperature of the cathode as the incident photon energy approaches the photoemission threshold. A theoretical model to calculate the transverse momentum distributions near this photoemission threshold is presented. An excellent match between the experimental measurements and the theoretical calculations is demonstrated. These measurements are relevant to low emittance electron sources for Free Electron Lasers and Ultrafast Electron Diffraction experiments.

Original languageEnglish (US)
Article number134101
JournalApplied Physics Letters
Issue number13
StatePublished - Sep 28 2015
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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