研究目的
To study the unoccupied and occupied electronic structures of an L-cysteine film using core-absorption and resonant photoelectron spectroscopies, and to estimate the delocalization lifetimes of the oxygen-1s and sulfur-2p excited states.
研究成果
The study successfully characterized the unoccupied and occupied electronic structures of L-cysteine films, identifying the contributions of various atomic orbitals to these states. The delocalization lifetimes of the oxygen-1s and sulfur-2p excited states were estimated, providing insights into the dynamics of core-excited states in L-cysteine films. These findings contribute to the understanding of L-cysteine's electronic properties, relevant for applications in bioelectronics and molecular electronics.
研究不足
The study is limited by the uncertainty in the decomposition of the increment spectrum into participator, spectator, and normal Auger components, affecting the precision of the delocalization lifetime estimates. Additionally, the comparison with molecular orbital calculations is based on isolated molecules, which may not fully account for solid-state effects.
1：Experimental Design and Method Selection:
The study utilized core-absorption and resonant photoelectron spectroscopies to investigate the electronic structures of an L-cysteine film. The experiments were carried out at Saga-University beam line BL13 in the Saga Light Source, using synchrotron light monochromatized by a varied-line spacing plane-grating monochromator.
2：Sample Selection and Data Sources:
L-cysteine films with a thickness of about 10 nm were evaporated on a gold or silver substrate from a quartz crucible at 2x10?5 Pa. The deposition rate was checked with a quartz microbalance.
3：List of Experimental Equipment and Materials:
A hemi-spherical electron analyzer, MBS A-1, was used with a band width set about 240 meV. The measured position on the sample was changed within 30 min to obtain quantitative resonant photoelectron intensity without irradiation damage.
4：Experimental Procedures and Operational Workflow:
Total electron-yield spectroscopy was used to measure core-level absorption spectra. Sample currents were normalized by the total electron-yield of a gold mesh in front of the sample. Band width of the monochromator was set for different core-level absorptions.
5：Data Analysis Methods:
The delocalization lifetime of the core-excited states was estimated using a core-hole clock method, comparing the integrated intensity of normal, spectator, and participator Auger decays.
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