期刊
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
卷 80, 期 12, 页码 -出版社
PHYSICAL SOC JAPAN
DOI: 10.1143/JPSJ.80.124711
关键词
photoinduced phase transition; femtosecond pump-probe spectroscopy; infrared vibrational spectroscopy; neutral-ionic phase transition; organic charge transfer complex
资金
- Ministry of Education, Culture, Sports, Science, and Technology of Japan
- G-COE of the Tokyo Institute of Technology
- Grants-in-Aid for Scientific Research [22655004] Funding Source: KAKEN
We studied the photoinduced neutral-to-ionic phase transition in tetrathiafulvalene-p-chloranil (TTF-CA) using time-resolved infrared (IR) vibrational spectroscopy with a broadband femtosecond IR laser pulse and a linear IR detector array. After photoexcitation, the strength of the TTF a(g)upsilon(3) band increased, indicating that dimerization is activated within similar to 1 ps. In contrast, the strength of the CAb(1u)upsilon(10) band, whose frequency is proportional to the degree of charge transfer (rho), decreased, and a broad weak band appeared in the lower-frequency region. This implies that large fluctuations in charge transfer continued until about 20 ps after the photoexcitation. These results indicate a large difference between the electronic structures of the ionic phases generated by thermalexcitation and photoexcitation, although a dimerized structure was observed in both cases.
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