Ultrafast Time-Resolved Hard X-Ray Emission Spectroscopy on a Tabletop
| Autor: | Ralph Jimenez, H. Tatsuno, Young I. Joe, Joseph W. Fowler, William B. Doriese, Steven M. Fatur, Galen C. O'Neil, Joel N. Ullom, Carl D. Reintsema, Luis Miaja-Avila, Niels H. Damrauer, Daniel Schmidt, Kevin L. Silverman, Daniel S. Swetz, Gene C. Hilton, Bradley K. Alpert |
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| Rok vydání: | 2016 |
| Předmět: |
Materials science
business.industry Physics QC1-999 Astrophysics::High Energy Astrophysical Phenomena General Physics and Astronomy 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Chemical reaction 0104 chemical sciences Electronic states Solar energy harvesting Iron complex Emission spectrum Atomic physics Photonics 0210 nano-technology X Ray Emission Spectroscopy business Ultrashort pulse |
| Zdroj: | Physical Review X, Vol 6, Iss 3, p 031047 (2016) |
| ISSN: | 2160-3308 |
| DOI: | 10.1103/physrevx.6.031047 |
| Popis: | Experimental tools capable of monitoring both atomic and electronic structure on ultrafast (femtosecond to picosecond) time scales are needed for investigating photophysical processes fundamental to light harvesting, photocatalysis, energy and data storage, and optical display technologies. Time-resolved hard x-ray (>3 keV) spectroscopies have proven valuable for these measurements due to their elemental specificity and sensitivity to geometric and electronic structures. Here, we present the first tabletop apparatus capable of performing time-resolved x-ray emission spectroscopy. The time resolution of the apparatus is better than 6 ps. By combining a compact laser-driven plasma source with a highly efficient array of microcalorimeter x-ray detectors, we are able to observe photoinduced spin changes in an archetypal polypyridyl iron complex [Fe(2,2^{′}-bipyridine)_{3}]^{2+} and accurately measure the lifetime of the quintet spin state. Our results demonstrate that ultrafast hard x-ray emission spectroscopy is no longer confined to large facilities and now can be performed in conventional laboratories with 10 times better time resolution than at synchrotrons. Our results are enabled, in part, by a 100- to 1000-fold increase in x-ray collection efficiency compared to current techniques. |
| Databáze: | OpenAIRE |
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