Dresden 2026 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 82: Focus Session: Unoccupied States by Inverse Photoemission III
O 82.6: Vortrag
Donnerstag, 12. März 2026, 12:15–12:30, WILL/A317
Development of near-ambient-pressure low-energy inverse photoelectron spectroscopy enabling measurement under the water vapor pressure — •Mihiro Kubo1, Gaku Yokogawa1, Hitoshi Tomizuka2, and Hiroyuki Yoshida1 — 1Chiba University, Chiba, Japan — 2TOYAMA Co., Ltd., Kanagawa, Japan
Inverse photoemission spectroscopy has evolved over fifty years, providing essential insight into the unoccupied electronic structure. In 2012, Dr. Yoshida developed low-energy inverse photoelectron spectroscopy (LEIPS[1]). This technique enables the measurement of organic materials without damaging the sample by reducing the kinetic energy below 5 eV, their typical damage threshold. To further extend the applicability of LEIPS, we are developing near-ambient-pressure LEIPS (NAP-LEIPS) capable of measurement under the vapor pressure of water (103 Pa). NAP-LEIPS will allow measurements of volatile samples, biomaterials, and catalysis with the introduction of reactive gases. To realize NAP-LEIPS, we use an electron gun with a yttria-coated disc cathode and an electrostatic energy analyzer. Because the electron source operates at pressures better than 10−5 Pa, a differential pumping system is installed between the electron source chamber and the main chamber (103 Pa). Electrons travel about 300 mm through the differential pumping section using an electrostatic transfer lens. Photons emitted from the sample are focused by a mirror, passed through a band-pass optical filter, and detected with a photomultiplier tube. The apparatus has been constructed and is currently in the start-up phase. [1] H. Yoshida, Chem. Phys. Lett. 539-540, 180 (2012).
Keywords: Inverse photoemission spectroscopy; Low-energy photoelectron spectroscopy; near ambient pressure; biomaterials; catalysis