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The electron emission properties of a single-crystal nitrogen-dopeddiamond(001) photocathode inserted in a 10kV DC photoelectron gun aredetermined using a tunable (235-410nm) ultraviolet laser radiation source forphotoemission from both the back nitrogen-doped substrate face and the fronthomo-epitaxially grown and undoped diamond crystal face. The measured spectraltrends of the mean transverse energy (MTE) and quantum efficiency (QE) of theemitted electrons are both anomalous and non-monotonic, but are shown to beconsistent with (i) the known physics of electron photoexcitation from thenitrogen substitution states into the conduction bands of diamond, (ii) theenergy position and dispersion characteristics of the conduction bands ofdiamond in the (001) emission direction, (iii) the effective electron affinityof the crystal faces, (iv) the strong electron-(optical)phonon coupling indiamond, and (v) the associated hot electron transport dynamics under energyequipartition with the optical phonons. Notably, the observed hot electronemission is shown to be restricted parallel to the photocathode surface by thelow transverse effective masses of the emitting band states - a transversemomentum filtering effect.

Spectral Emission Properties of a Nitrogen-doped Diamond(001) Photocathode: Hot Electron Transport and Transverse Momentum Filtering