Author(s): Samiran Banu, Tatsuya Amano, Takahisa Kato, Kou Takubo, Yoichi Okimoto, Shinya Koshihara, Yohei Kawakami, Hirotake Itoh, Wataru Kosaka, Hitoshi Miyasaka, Shinichiro Iwai, Akira Takahashi, and Tadahiko Ishikawa Sub-10-fs pump-probe reflectivity measurements combined with model calculations reveal the emergence of a photoinduced hidden (PH) state in a donor-acceptor-type metal-organic framework. Transient spectra exhibit an additional absorption band developing on a $≈30\text{ }\text{ }\mathrm{fs}$ timescal… [Phys. Rev. Lett. 137, 046902] Published Wed Jul 22, 2026