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Volumn 121, Issue 38, 1999, Pages 8876-8881

Magnetic field dependence of ultrafast intersystem-crossing: A triplet mechanism on the picosecond time scale?

Author keywords

[No Author keywords available]

Indexed keywords

BACTERIOCHLOROPHYLL; PYRIDINE DERIVATIVE; TOLUENE;

EID: 0033615286     PISSN: 00027863     EISSN: None     Source Type: Journal    
DOI: 10.1021/ja9842520     Document Type: Article
Times cited : (15)

References (32)
  • 5
    • 0344469578 scopus 로고    scopus 로고
    • note
    • 2+ spin system.
  • 6
    • 0345332317 scopus 로고
    • Dissertation, TU München
    • Hartwich, G. Dissertation, TU München, 1994.
    • (1994)
    • Hartwich, G.1
  • 8
    • 0344038421 scopus 로고    scopus 로고
    • note
    • The multiplicity of the complex depends on the combination of the two spin systems of the complex. Consequently, the overall spin state of the complex can change without changing the spin state of one subsystem or may remain the same while the spin states of the subsystems change simultaneously. The transient absorption experiment probes only within one subsystem, i.e., the π-system, and is therefore almost insensitive toward the overall spin state.
  • 11
    • 0345332314 scopus 로고
    • ODMR Studies of Excited Triplet States in High Field
    • Clarke, R. H., Ed.; John Wiley & Sons: New York
    • Pratt, D. W. ODMR Studies of Excited Triplet States in High Field. In Triplet State ODMR Spectroscopy; Clarke, R. H., Ed.; John Wiley & Sons: New York, 1982; pp 43-82.
    • (1982) Triplet State ODMR Spectroscopy , pp. 43-82
    • Pratt, D.W.1
  • 14
    • 0344469577 scopus 로고    scopus 로고
    • note
    • Because of the temporal form of the pump-pulse, time constants on the order of 100 fs are difficult to extract from the data presented here. However, the value given is in agreement with the result of the study in ref 7. In this study, presumably due to a slightly different compressor setting, the temporal behavior of the pump-pulse was free of the wings seen here.
  • 25
    • 0344469574 scopus 로고    scopus 로고
    • note
    • For instance, the local triplet states, of which the overall triplet consists, could have different electron g-factors which would alter the Hamiltonian in the formalism.
  • 27
    • 0344469573 scopus 로고    scopus 로고
    • note
    • To reproduce the zero-field data, the initial populations should be equal to the respective amplitudes obtained by the triexponential fit. However, these values are roughly close to 1/3, so for our semiquantitative purpose we assume equal population of all triplet states. It should be noted that here, contrary to the situation usually encountered in ODMR, the triplet state is populated from a triplet precursor. When a triplet state is populated from a singlet precursor, the distribution of initial population follows the ratio of the (small) singlet admixtures. For a triplet precursor, the initial population is determined by the triplet characters, which are close to 1 for all sublevels, leading to nearly equal initial population.
  • 28
    • 0002159556 scopus 로고
    • Nuclear Magnetic Resonance of Paramagnetic Metalloporphyrins
    • Dolphin, D., Ed.; Academic Press: New York
    • La Mar, G. N.; Walker, F. A. Nuclear Magnetic Resonance of Paramagnetic Metalloporphyrins. In The Porphyrins IV; Dolphin, D., Ed.; Academic Press: New York, 1979; pp 61-157.
    • (1979) The Porphyrins IV , pp. 61-157
    • La Mar, G.N.1    Walker, F.A.2
  • 29
    • 0345332304 scopus 로고
    • ISC rate constants differing by more than an order of magnitude are by no means extraordinary and have, for instance, been observed for the local π-π* triplet states of free base tetrapyrrole. van Drop, W. G.; et al. Mol. Phys. 1975, 30, 1701-1721.
    • (1975) Mol. Phys. , vol.30 , pp. 1701-1721
    • Van Drop, W.G.1
  • 30
    • 0000879158 scopus 로고
    • 2+-porphyrin indeed demonstrates that there is a substantial difference between the axial and the in-plane bond lengths. Kirner, J. F.; et al. Inorg. Nucl. Chem. Lett. 1975, 11, 107-112.
    • (1975) Inorg. Nucl. Chem. Lett. , vol.11 , pp. 107-112
    • Kirner, J.F.1


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.