A One-Step Model of Photoemission from Single Crystal Surfaces

TL;DR

This paper introduces a comprehensive 3-D one-step photoemission model for single crystal surfaces, accurately predicting quantum efficiency and electron momentum distributions near the threshold, aiding the development of electron sources.

Contribution

The paper presents a novel 3-D one-step model that calculates photoemission properties without ad hoc parameters, explaining the vectorial photoelectric effect for the first time.

Findings

Accurately predicts quantum efficiency of Ag(111) surface

Provides a theoretical explanation for the vectorial photoelectric effect

Can be used to screen single crystal photoemitters for advanced applications

Abstract

In this paper, we present a 3-D one step photoemission model that can be used to calculate the quantum efficiency and momentum distributions of electrons photoemitted from ordered single crystal surfaces close to the photoemission threshold. Using Ag(111) as an example, we show that the model can not only calculate the quantum efficiency from the surface state accurately without using any ad hoc parameters, but also provides a theoretical quantitative explanation of the vectorial photoelectric effect. This model in conjunction with other band structure and wave function calculation techniques can be effectively used to screen single crystal photoemitters for use as electron sources for particle accelerator and ultrafast electron diffraction applications.