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

100%
Matsubara Y., Yoshida T., Ishikawa T., Okimoto Y., Koshihara S., Onda K.
Acta Physica Polonica A
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2012
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vol. 121
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issue 2
340-342
EN
We studied the photoinduced ionic to neutral phase transition in tetrathiafulvalene-p-chloranil (TTF-CA) using time-resolved infrared vibrational spectroscopy. By monitoring the charge sensitive b_{1u} ν_{10} 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.
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Slow Dynamics of the Photoinduced Phase Transition in Pd(dmit)_2 Salts (dmit = 1,3-dithiol-2-thione-4,5-dithiolate)

84%
Ishikawa T., Tanaka T., Fukazawa N., Matsubara Y., Okimoto Y., Onda K., Koshihara S., Tamura M., Kato R.
Acta Physica Polonica A
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2012
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vol. 121
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issue 2B
316-318
EN
Slow dynamics of the initially photoinduced state has been observed by the pump-probe type time-resolved reflection spectroscopy in the charge separated phase of the half-filled strong dimer system, Et_2Me_2Sb[Pd(dmit)_2]_2 (dmit = 1,3-dithiol-2-thione-4,5-dithiolate). We have succeeded to reproduce the probe photon energy dependence of the time profile qualitatively in the time delay range from 10 ps to 1 ns assuming the dynamical expansion of the domain of the photo-induced dimer-Mott insulating phase in the host charge-separated one.
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