Berlin 2024 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 37: Poster: Electronic Structure of Surfaces and Spectroscopy of Surface States

O 37.3: Poster

Dienstag, 19. März 2024, 18:00–20:00, Poster D

Two-photon photoemission on Ag(111) with time-of-flight momentum microscope — •Yu-Chan Lin¹, Chieh-I Chen^1,2,3, Mukesh Singh¹, Prabesh Bista^1,2,4, and Cheng-Tien Chiang^1,2,5 — ¹Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei, Taiwan — ²Molecular Science and Technology Program, Taiwan International Graduate Program, Academia Sinica, Taipei, Taiwan — ³Department of Chemistry, National Tsing Hua University — ⁴Department of Physics, National Central University — ⁵Department of Physics, National Taiwan University, Taipei, Taiwan

This study explores two-photon resonances in the electronic structure of Ag(111) through the application of two-photon photoemission. The light source is based on third harmonic generation via nonlinear optical crystals, transforming 1.2 eV, 300 fs laser pulses to 3.6 eV. By employing time-of-flight photoelectron momentum microscope, the electronic states of both occupied and unoccupied regions of the Ag sp bands can be observed via resonant two-photon absorption. By measuring the angular and time-of-flight distributions of the photoelectrons, the energy-momentum dispersion relation of these bands can be retrieved. These results are analyzed in detail and compared with earlier literature at different photon energies.