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Titles listPatterns During Photoexcitation and High-Spin → Low-Spin Relaxation in [Fe(ptz)6](BF 4 ) 2 Spin Transition...
Titles listPatterns During Photoexcitation and High-Spin → Low-Spin Relaxation in [Fe(ptz)6](BF 4 ) 2 Spin Transition...
Scientific Article
unige:17026 
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Patterns During Photoexcitation and High-Spin → Low-Spin Relaxation in [Fe(ptz)6](BF 4 ) 2 Spin Transition Crystal |
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| Published in | Molecular crystals and liquid crystals. 1999, vol. 335, no. 1, p. 511-520 | |
| Abstract | The propagation of the high-spin (HS) → low-spin (LS) relaxation at 53 K in a single crystal of the iron (II) spin-crossover compound [Fe(ptz)6](BF4)2 was followed by photography, after inducing the local photoexcitation to the metastable HS state at 20 K using the single wavelength (457 nm Ar± ion laser) irradiation. The photoinduced formation of the HS—LS patterns with a characteristic diameter of some 0.1 mm was observed to occur inhomogeneously at a macroscopic scale already during photoexcitation. The contrast between the HS (transparent) and the LS (purple) regions was amplified during relaxation. The effect is described in terms of a transient instability, for which a microscopic model in the mean-field approximation is proposed. The mechanism for the development of patterns at the macroscopic scale is discussed. | |
| Keywords | Spin transition — Photography — Laser photoexcitation — Instability | |
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| Structures | ||
| Research group | Groupe Hauser | |
| Citation (ISO format) | JEFTIC, Jelena et al. Patterns During Photoexcitation and High-Spin → Low-Spin Relaxation in [Fe(ptz)6](BF 4 ) 2 Spin Transition Crystal. In: Molecular crystals and liquid crystals, 1999, vol. 335, n° 1, p. 511-520. doi: 10.1080/10587259908028892 https://archive-ouverte.unige.ch/unige:17026 |
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