[2Dp01-08] Advancement of experimental techniques for surface analysis using synchrotron radiation and its applications: Synchrotron Radiation Surface Science Division's Session

[2Dp02] Sample – aperture cone distance dependence of photoelectron intensity in near-ambient pressure photoemission spectroscopy

*Satoru Suzuki¹, Kento Takenaka², Koji Takahara¹, Hirosuke Sumida³ (1. Laboratory of Advanced Science and Technology for Industry, University of Hyogo, 2. Graduate School of Science, University of Hyogo, 3. Mazda Motor Corporation)

Increasing the sample – aperture cone distance d has a significant effect on the environmental charge compensation in photoemission spectroscopy of insulators. Here, we investigated the d dependence of photoelectron intensity in near-ambient pressure photoemission spectroscopy by varying d over a wide range. ln (I / Io) decreased linearly with P at each d, as expected from the Beer-Lambert law, I / Io = exp (- σ P d / k_B T). where I and Io are photoelectron intensities in gas and vacuum, and σ is the electron scattering cross section. From these measurements, it was found that increasing d in charging-free measurements of an insulator is also advantageous from the viewpoint of photoelectron intensity. Moreover, to reproduce the result, it was necessary to change d to d + do (do is a constant) in the Beer-Lambert law. The correction seems to be necessary due to the effect of residual gas in the electron lens.