ACTA

Photoinduced Ionic to Neutral Phase Transition in TTF-CA Studied by Time-Resolved Infrared Vibrational Spectroscopy

Y. Matsubara^a, T. Yoshida^a, T. Ishikawa^a, Y. Okimoto^a, S.-Y. Koshihara^a,b and K. Onda^c
^aDepartment of Materials Science, Tokyo Institute of Technology, Megro-ku, Tokyo 152-8551, Japan
^bCREST, Japan Science and Technology Agency (JST), Japan
^cDepartment of Environ. Chem. and Engineering, Tokyo Institute of Technology, Nagatsuta-Yokohama, 226-8502, Japan

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We studied the photoinduced ionic to neutral phase transition in tetra-thiafulvalene-p-chloranil (TTF-CA) using time-resolved infrared vibrational spectroscopy. By monitoring the charge sensitive b_1u ν₁₀ band of CA after photoexcitation by a 1.55 eV pulse, we found that the photoinduced N-phase has the same charge of the N-phase in thermal equilibrium and there is no charge variation during the photoinduced phase transition. We also found that the photoinduced N-phase grows through at least two steps over 300 ps.

DOI: 10.12693/APhysPolA.121.340
PACS numbers: 78.30.Jw, 78.47.D-, 78.47.jg