Urbanek-Chodorow Postdoctral Fellow at Stanford PULSE Institute

Honors & Awards

  • Urbanek-Chodorow Postdoctral Fellowship, Stanford University (2020-2023)
  • Funai Overseas Scholarship, Funai Foundation for Information and Technology (2015-2018)

Professional Education

  • Ph.D, University of California, Berkeley, Chemistry (2020)
  • B.S., University of Tokyo, Chemistry (2015)

Stanford Advisors

All Publications

  • Probing electron-hole coherence in strongly driven 2D materials using high-harmonic generation OPTICA Heide, C., Kobayashi, Y., Johnson, A. C., Liu, F., Heinz, T. F., Reis, D. A., Ghimire, S. 2022; 9 (5): 512-516
  • Visualizing coherent vibrational motion in the molecular iodine B- 3 Pi(0+u) state using ultrafast XUV transient-absorption spectroscopy PHYSICAL REVIEW A Poullain, S. M., Kobayashi, Y., Chang, K. F., Leone, S. R. 2021; 104 (2)
  • X-ray transient absorption reveals the 1Au (npi*) state of pyrazine in electronic relaxation. Nature communications Scutelnic, V., Tsuru, S., Papai, M., Yang, Z., Epshtein, M., Xue, T., Haugen, E., Kobayashi, Y., Krylov, A. I., Moller, K. B., Coriani, S., Leone, S. R. 2021; 12 (1): 5003


    Electronic relaxation in organic chromophores often proceeds via states not directly accessible by photoexcitation. We report on the photoinduced dynamics of pyrazine that involves such states, excited by a 267nm laser and probed with X-ray transient absorption spectroscopy in a table-top setup. In addition to the previously characterized 1B2u (pipi*) (S2) and 1B3u (npi*) (S1) states, the participation of the optically dark 1Au (npi*) state is assigned by a combination of experimental X-ray core-to-valence spectroscopy, electronic structure calculations, nonadiabatic dynamics simulations, and X-ray spectral computations. Despite 1Au (npi*) and 1B3u (npi*) states having similar energies at relaxed geometry, their X-ray absorption spectra differ largely in transition energy and oscillator strength. The 1Au (npi*) state is populated in 200±50 femtoseconds after electronic excitation and plays a key role in the relaxation of pyrazine to the ground state.

    View details for DOI 10.1038/s41467-021-25045-0

    View details for PubMedID 34408141