title: microARPES and nanoARPES at diffraction-limited light sources: opportunities and performance gains.
abstract: The scientific opportunities for microARPES and nanoARPES techniques are discussed, and the benefits to these techniques at diffraction-limited light sources are presented, in particular the impact on spectromicroscopic ARPES (angle-resolved photoemission spectroscopy) of upgrading the Advanced Light Source to diffraction-limited performance. The most important consideration is whether the space-charge broadening, impacting the energy and momentum resolution, will limit the possible benefits for ARPES. Calculations of energy broadening due to space-charge effects will be presented over a wide range of parameters, and optimum conditions for ARPES will be discussed. The conclusion is that spectromicroscopic ARPES will greatly benefit from the advent of diffraction-limited light sources; space-charge broadening effects will not be a limiting factor.
authors.affiliation: Advanced Light Source, MS 6-2100, E. O. Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.
authors.forename: Eli
authors.initials: E
authors.lastname: Rotenberg
authors.affiliation: Advanced Light Source, MS 6-2100, E. O. Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.
authors.forename: Aaron
authors.initials: A
authors.lastname: Bostwick
keywords: ARPES; nanoARPES; photoemission; space-charge broadening