Coherent multiphoton photoemission spectroscopy of image-potential state on Ir(111) surface
Year: 2025
Type: article
Abstract: Multiphoton photoemission provides a means to investigate unoccupied electronic states via nonlinear light-matter interactions. In this work, we employ five-photon photoemission spectroscopy to identify, for the first time, the image-potential state (IPS) on the Ir(111) surface. Distinct from commonly studied noble metals such as Cu and Ag, the Ir(111) electronic structure leads to a strong sensitivity to excitation energy: a reduction from 1.57 eV to 1.49 eV significantly diminishes the signal. The theoretical analysis attributes this effect to the d-band proximity to the Fermi level, which influences the initial-state population and transition probabilities governing the multiphoton excitation pathways.
Source: Applied Physics Express
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $2,365
OpenAlex ID: W4410530487