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. 2022 Feb 28;13:1083. doi: 10.1038/s41467-022-28224-9

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Fig. 4 — a Chemical composition and structure of FAMACs perovskite (top), polaron–cation coupling and associated blue-shift of molecular vibration (bottom). b Far-field transmission visible-pump (2.4 eV) IR-probe spectrum at T = 0.5 ps (top), the ground-state (GS) vibrational absorbance A_vib and transient absorbance ΔA_vib (bottom).