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Ultrafast Electron Diffraction (UED) investigation of thin film melting

This project focuses on the transient melting of thin films, specifically Au and CuIr2S4, using ultrafast electron diffraction (UED). The goal is to understand local structural fluctuations and solid-liquid phase transitions. Preliminary results show the melting dynamics in gold thin films, and next steps include collinear geometry experiments and UED data collection on different film sizes and laser excitation levels.

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Ultrafast Electron Diffraction (UED) investigation of thin film melting

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  1. Ultrafast Electron Diffraction (UED) investigation of thin film melting Tadesse Assefa and Ian Robinson (PI) Jing Tao and Junjie Li (collaborators) Condensed Matter and Material Science Department Brookhaven National Lab 2019 ATF Users Meeting: Application for Continuation (no experiment time received since the last users meeting)

  2. Transient Melting of Au Film XRD vs UED 300 nm 254 mJ/cm2 Single-shot from 30 nm Au film R. Ernstorfer, D. Miller et al., Science (2009) Single-shot XRD data collected on 300 nm Au film from PAL XFEL, Pohang, South Korea Tadesse Assefa, Yue Cao, Emil Bozin, Pavol Juhas, Simon Billinge, Sunam Kim, Jae Hyuk Lee, Yongsam Kim, Jaeku Park, Sang-Youn Park, Intae Eom, Hyojung Hyun, Tae-Yeong Koo, Jaehun Park, Daewoong Nam, Sang Soo Kim, Changyong Song, Dongjin Kim, Sungwon Kim, Hungjung Kim and Ian Robinson, Under review (2018) Mo, M. Z, S. Glenzeret al.Science 360, (2018)

  3. Melt-front Dynamics in Gold Thin Films 300 nm 254 mJ/cm2 (111) (200) (311) Intermediate peak Berry et al., PRB 77 224114 (2008), Chawla et al., PRB 84, (2011) and Giret et al., APL 103 253107 (2013)

  4. 100 ps -50 ps Experimental Geometry and Preliminary Results at UED, BNL 220 ps 390 ps Laser Electrons Preliminary results ED: 50 nm Au, film, 300 shots and No pump What’s next? • The experiment will be collinear geometry • Sample will be mounted on a 2D scanner and for a single-spot experiment • Potential application to understand local structural fluctuations and solid-liquid phase transitions • UED data on 30 nm, 40 nm and 100 nm after 400 nm laser excitation and fluence dependence measurements: 10-50 mJ/cm2 • Melting of Ir-Ir dimers in CuIr2S4. E. Bozin, et al. PRL 106, 045501 (2011)

  5. Beam Requirements • Sample Materials: • Single crystal Au, single crystal CuIr2S4 • Special Equipment: • pump-laser 400 nm, sample translation stage and cryostat

  6. 2019 Experiment Time Estimates Run Hours (include setup time in hours estimate): Number of experiment hours: Overall % setup time: Hazards & installation requirements: Large installation (chamber, insertion device etc…): Cryostat for the CuIr2S4 sample Pump laser use: 400 nm and change laser fluence Sample: free-standing Au thin films and CuIr2S4 Cryogens: N Introducing new magnetic elements: N Introducing new materials into the beam path: N Any other foreseeable beam line modifications: N

  7. Thank you for your attention!

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