[8p-N306-1~20] 12.2 Characterization and Materials Physics

2:15 PM - 2:30 PM JST(5:15 AM - 5:30 AM UTC)

[8p-N306-4] High-Resolution Low-Energy Inverse Photoelectron Spectroscopy Enabled by an Electron Source with an Electrostatic Monochromator

〇Taichi Suruga¹, Tomoko Onishi¹, Daichi Honma¹, Masaya Kai¹, Issei Ishimori¹, Francois C. Bocquet², F. Stefan Tautz², Hiroyuki Yoshida^1,3 (1.Chiba Univ., 2.Forschungszentrum Julich., 3.Chiba Univ.)

Keywords:

inverse photoelectron spectroscopy,electron source,resolution

Inverse photoelectron spectroscopy (IPES) is a technique for probing unoccupied electronic states, but conventional systems have faced challenges in energy resolution and signal-to-noise ratio (S/N). To address these issues, we equipped the electron source of a Low energy inverse photoelectron spectroscopy(LEIPS) system with a monochromator. Using a bandpass filter for photon detection, we achieved an energy resolution of 0.127 eV, with the electron gun resolution estimated at 0.093 eV. The signal intensity of the image potential states (IPS) on Cu was approximately ten times higher than that of conventional IPES, and the background noise of the photon detector was reduced to one-tenth, enabling high-resolution and practical measurement of unoccupied states.