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O'Neil GC, Miaja-Avila L, Joe YI, Alpert BK, Balasubramanian M, Sagar DM, Doriese W, Fowler JW, Fullagar WK, Chen N, Hilton GC, Jimenez R, Ravel B, Reintsema CD, Schmidt DR, Silverman KL, Swetz DS, Uhlig J, Ullom JN. Ultrafast Time-Resolved X-ray Absorption Spectroscopy of Ferrioxalate Photolysis with a Laser Plasma X-ray Source and Microcalorimeter Array. J Phys Chem Lett 2017; 8:1099-1104. [PMID: 28212035 DOI: 10.1021/acs.jpclett.7b00078] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The detailed pathways of photoactivity on ultrafast time scales are a topic of contemporary interest. Using a tabletop apparatus based on a laser plasma X-ray source and an array of cryogenic microcalorimeter X-ray detectors, we measured a transient X-ray absorption spectrum during the ferrioxalate photoreduction reaction. With these high-efficiency detectors, we observe the Fe K edge move to lower energies and the amplitude of the extended X-ray absorption fine structure reduce, consistent with a photoreduction mechanism in which electron transfer precedes disassociation. These results are compared to previously published transient X-ray absorption measurements on the same reaction and found to be consistent with the results from Ogi et al. and inconsistent with the results of Chen et al. ( Ogi , Y. ; et al. Struct. Dyn. 2015 , 2 , 034901 ; Chen , J. ; Zhang , H. ; Tomov , I. V. ; Ding , X. ; Rentzepis , P. M. Chem. Phys. Lett. 2007 , 437 , 50 - 55 ). We provide quantitative limits on the Fe-O bond length change. Finally, we review potential improvements to our measurement technique, highlighting the future potential of tabletop X-ray science using microcalorimeter sensors.
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Affiliation(s)
- Galen C O'Neil
- National Institute of Standards and Technology , Boulder, Colorado 80305, United States
| | - Luis Miaja-Avila
- National Institute of Standards and Technology , Boulder, Colorado 80305, United States
| | - Young Il Joe
- National Institute of Standards and Technology , Boulder, Colorado 80305, United States
| | - Bradley K Alpert
- National Institute of Standards and Technology , Boulder, Colorado 80305, United States
| | | | - D M Sagar
- JILA, National Institute of Standards and Technology and University of Colorado Boulder , Boulder, Colorado 80309, United States
| | - William Doriese
- National Institute of Standards and Technology , Boulder, Colorado 80305, United States
| | - Joseph W Fowler
- National Institute of Standards and Technology , Boulder, Colorado 80305, United States
| | | | - Ning Chen
- Canadian Light Source , Saskatoon, Saskatchewan S7N 2V3, Canada
| | - Gene C Hilton
- National Institute of Standards and Technology , Boulder, Colorado 80305, United States
| | - Ralph Jimenez
- JILA, National Institute of Standards and Technology and University of Colorado Boulder , Boulder, Colorado 80309, United States
- Department of Chemistry and Biochemistry, University of Colorado Boulder , Boulder, Colorado 80309, United States
| | - Bruce Ravel
- National Institute of Standards and Technology , Gaithersburg, Maryland 20899, United States
| | - Carl D Reintsema
- National Institute of Standards and Technology , Boulder, Colorado 80305, United States
| | - Dan R Schmidt
- National Institute of Standards and Technology , Boulder, Colorado 80305, United States
| | - Kevin L Silverman
- National Institute of Standards and Technology , Boulder, Colorado 80305, United States
| | - Daniel S Swetz
- National Institute of Standards and Technology , Boulder, Colorado 80305, United States
| | - Jens Uhlig
- Department of Chemical Physics, Lund University , Lund 223 62, Sweden
| | - Joel N Ullom
- National Institute of Standards and Technology , Boulder, Colorado 80305, United States
- Department of Physics, University of Colorado Boulder , Boulder, Colorado 80309, United States
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