1. X-ray Spectroscopy of a Rare-Earth Molecular System Measured at the Single Atom Limit in Room Temperature
- Author
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Wieghold, Sarah, Shirato, Nozomi, Cheng, Xinyue, Latt, Kyaw Zin, Trainer, Daniel, Sottie, Richard, Rosenmann, Daniel, Masson, Eric, Rose, Volker, and Hla, Saw Wai
- Subjects
Condensed Matter - Materials Science - Abstract
We investigate the limit of X-ray detection at room temperature on rare-earth molecular films using lanthanum and a pyridine-based dicarboxamide organic linker as a model system. Synchrotron X-ray scanning tunneling microscopy is used to probe the molecules with different coverages on a HOPG substrate. X-ray-induced photocurrent intensities are measured as a function of molecular coverage on the sample allowing a correlation of the amount of La ions with the photocurrent signal strength. X-ray absorption spectroscopy shows cogent M4,5 absorption edges of the lanthanum ion originated by the transitions from the 3d3/2 and 3d5/2 to 4f orbitals. X-ray absorption spectra measured in the tunneling regime further reveal an X-ray excited tunneling current produced at the M4,5 absorption edge of La ion down to the ultimate atomic limit at room temperature., Comment: 19 pages, 4 figures
- Published
- 2023