X-ray absorption near edge spectroscopy (XANES or NEXAFS) is a powerful technique for electronic structure determination. However, widespread use of XANES is limited by the need for synchrotron light sources with tunable x-ray energy. Recent developments in extreme ultraviolet (XUV) light sources using the laser-based technique of high-harmonic generation have enabled core-level spectroscopy to be performed on femtosecond to attosecond timescales. In this work, we extend the scope of tabletop XUV spectroscopy and demonstrate that M2,3-edge XANES, corresponding to 3p→3d transitions, can reliably measure the electronic structure of first-row transition metal coordination complexes with femtosecond time resolution. In semiconductors such as CH3NH3PbI3, distinct signals are observed for photoinduced electrons and holes, allowing the dynamics of each carrier to be tracked independently. This work establishes high-harmonic spectroscopy as a useful tool for mainstream research in inorganic, organometallic, and materials chemistry.

Ultrafast tabletop XUV absorption spectroscopy of transition metal complexes and organohalide perovskites

255th National Meeting (2018)

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