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Description:

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, Ir(111) electronic structure leads to a strong sensitivity to excitation energy:
a reduction from 1.57-1.49 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.

Rights:

• Creative Commons BY Attribution 4.0 International
  

Keyword: nonlinear light-matter interaction, multiphoton excitation, photoemission spectroscopy, image-potential states

Date published: 2025-06-01

Publisher: IOP Publishing

Journal:

• Applied Physics Express (ISSN: 18820778) vol. 18 issue. 6 062001

Funding:

• National Science and Technology Council 112-2923-M-A49-001-MY2
• Japan Society for the Promotion of Science Kakenhi 22H0196

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.35848/1882-0786/addb1e

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Updated at: 2025-06-09 12:30:35 +0900

Published on MDR: 2025-06-09 12:20:58 +0900