[11a-A33-1~13] 12.2 Characterization and Materials Physics

11:15 AM - 11:30 AM JST(2:15 AM - 2:30 AM UTC)

[11a-A33-9] Direct observation of electron–molecular vibration coupling in copper phthalocyanine monolayer by high-resolution low-energy inverse photoemission spectroscopy

Tomoko Onishi¹, Mihiro Kubo¹, 〇Hiroyuki Yoshida^1,2 (1.Chiba Univ., 2.MCRC, Chiba Univ.)

Keywords:

electron-molecular vibration coupling,low energy inverse photoelectron spectroscopy,electron mobility

Electron–molecular vibration coupling in the LUMO of a CuPc monolayer was directly observed using high-resolution low-energy inverse photoemission spectroscopy (LEIPS). Distinct vibrational satellite structures were identified on the high-energy side of the main LUMO peak and successfully reproduced by Gaussian fitting. The energy separation (0.18–0.21 eV) matches intramolecular vibrational energies, indicating that the satellites originate from electron–vibration coupling. The Huang–Rhys factor was estimated, larger than that reported for holes in the HOMO, demonstrating stronger coupling for electrons.