X-ray microprobe of optical strong-field processes |
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| Institution: | 1. Chemistry Division, Argonne National Laboratory, Argonne, IL 60439, USA;2. Advanced Photon Source, Argonne National Laboratory, Argonne, IL 60439, USA;1. School of Physics, University of Melbourne, Victoria 3010, Australia;1. Division of Environment, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong;2. Department of Chemical and Biomolecular Engineering, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong;3. Materials Characterization and Preparation Facility, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong;4. Advanced Engineering Materials Facility, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong;5. School of Energy and Environment, City University of Hong Kong, Hong Kong;1. Department of Chemistry, Argonne-Northwestern Solar Energy Research Center, and Institute for Sustainability and Energy at Northwestern, Northwestern University, 2145 Sheridan Rd, Evanston, IL 60208, USA;2. Department of Chemistry, Argonne-Northwestern Solar Energy Research Center, and Yale Energy Sciences Institute, Yale University, 225 Prospect St, New Haven, CT 06520, USA;3. Department of Physics, AlbaNova University Center, Stockholm University, SE-10691 Stockholm, Sweden;1. Qatar Environment & Energy Research Institute (QEERI), Hamad Bin Khalifa University (HBKU), Doha, Qatar;2. Department of Chemistry and Institute for Sustainability and Energy at Northwestern, Northwestern University, 2145 Sheridan Rd., Evanston, IL 60208-3113, USA |
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| Abstract: | A time-resolved X-ray microprobe to study optical strong-field processes has been developed. Individual atoms or molecules located within the strong-field environment created by a focused ultrafast laser are probed by undulator-produced X-ray pulses to achieve spatial, temporal, spectral and polarization selectivity. Approximately 106 monochromatic X-rays per 100-ps pulse are focused into a ∼10 μm spot to selectively probe atoms in focal volumes where intensities up to 1015 W/cm2 can be present. In this paper, we describe the time-resolved X-ray microprobe and provide some illustrative examples from our work studying strong-field phenomena such as laser-modified absorption spectra, Coulomb explosion, transient laser-produced plasmas and molecular alignment. |
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