Journal
JOURNAL OF PHYSICAL CHEMISTRY A
Volume 111, Issue 28, Pages 6449-6455Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp072807k
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We report on the first direct atomic-level photodiffraction evidence for domain formation by doping with charge photocarriers of the stable organic radical TTTA (1,3,5-trithia-2,4,6-triazapentalenyl), which exhibits unusually wide thermal hysteresis of the paramagnetic-to-diamagnetic phase transition around ambient temperature. A setup for steady-state powder photodiffraction was developed for the purpose, composed of a second harmonic pulsed visible pump (532 nm) coupled with a powder diffractometer using monochromatic synchrotron X-ray radiation as the probe. The refined structures of the photoinduced phase and the high-temperature phase are structurally identical. The result supports the model according to which photoexcitation causes suppression of the spin-Peierls instability and separation of the radical dimers, resulting in a structure that is essentially identical with the unperturbed high-temperature phase.
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