Transient kinetics of light-induced metastable states in single crystals and aqueous solutions of Na-2[Fe(CN)(5)NO]center dot 2H(2)O

Autor(en): Schaniel, D
Woike, T
Merschjann, C
Imlau, M 
Stichwörter: ELECTRONIC STATES; LINKAGE ISOMERS; Materials Science; Materials Science, Multidisciplinary; Physics; Physics, Applied; Physics, Condensed Matter
Erscheinungsdatum: 2005
Herausgeber: AMER PHYSICAL SOC
Journal: PHYSICAL REVIEW B
Volumen: 72
Ausgabe: 19
Zusammenfassung: 
The generation and relaxation of light-induced metastable states at room temperature is investigated in single crystals and aqueous solutions of Na-2[Fe(CN)(5)NO]center dot 2H(2)O (SNP), using transient absorption spectroscopy. The temporal monoexponential decay after exposure to nanosecond laser pulses results from the thermal deexcitation of the metastable state named SII. The lifetime tau of SII at T=302 K is tau=1.8(1)x10(-7) s in single crystals and tau=1.1(1)x10(-7) s in aqueous solutions. An Arrhenius-like behavior is verified yielding the activation energy E-A=0.43(3) eV and the frequency factor Z=7x10(13) s(-1). The buildup time of the metastable state SII is faster than 1 ns and occurs via a singlet excited state. With an exposure of 0.8 J/cm(2), 0.8(2)% of the molecules can be transferred from the ground state to SII.
ISSN: 24699950
DOI: 10.1103/PhysRevB.72.195119

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