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84888101439
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24 February
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E. K. Wilson, Chem. Eng. News 33 (24 February 1997); G. Taubes, Science 275, 1420 (1997); D. N. Beratan, S. Priyadarshy, S. M. Risser, Chem. Biol. 4, 3 (1997).
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Chem. Eng. News
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Wilson, E.K.1
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0031054667
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E. K. Wilson, Chem. Eng. News 33 (24 February 1997); G. Taubes, Science 275, 1420 (1997); D. N. Beratan, S. Priyadarshy, S. M. Risser, Chem. Biol. 4, 3 (1997).
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Science
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Taubes, G.1
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3
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0030994854
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E. K. Wilson, Chem. Eng. News 33 (24 February 1997); G. Taubes, Science 275, 1420 (1997); D. N. Beratan, S. Priyadarshy, S. M. Risser, Chem. Biol. 4, 3 (1997).
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Chem. Biol.
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Beratan, D.N.1
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0029846245
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M. R. Arkin et al., Science 273, 475 (1996).
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Arkin, M.R.1
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5
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C. J. Murphy et al., ibid. 262, 1025 (1993).
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Murphy, C.J.1
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E. J. C. Olson, D. Hu, A. Hörmann, P. F. Barbara, J. Phys. Chem. B 101, 299 (1997).
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Olson, E.J.C.1
Hu, D.2
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Barbara, P.F.4
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15
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14444280111
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note
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The hairpin structures were calculated with a modified molecular mechanics (MM2) force field within Hyperchem V5.01 (Hypercube, Waterloo, Ontario).
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18
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14444268952
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note
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Fluorescence decays were determined by means of a Photon Technology International Model LS1 photon-counting apparatus with a minimum time resolution of ∼0.3 ns.
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19
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8944252338
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The samples were contained in a 2-mm path length cuvette and had absorbances of about 0.1 at 340 nm. An amplified Ti-sapphire-based laser system was used to pump an optical parametric amplifier to generate ∼300-fs, 680-nm pulses (frequency doubled with a potassium dihydrogen phosphate crystal to obtain 340-nm pulses) at a 1.36-kHz repetition rate. Samples were excited with 100 nJ of 340-nm light focused to a 250-μm spot. Absolute transient absorption changes were on the order of 0.01. The uncertainty of the kinetic data increases in the nanosecond regime. For a description of the laser system, see S. R. Greenfield, W. A. Svec, D. Gosztola, M. R. Wasielewski, J. Am. Chem. Soc. 118, 6767 (1996); S. R. Greenfield and M. R. Wasielewski, Opt. Lett. 20, 1394 (1995).
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J. Am. Chem. Soc.
, vol.118
, pp. 6767
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Greenfield, S.R.1
Svec, W.A.2
Gosztola, D.3
Wasielewski, M.R.4
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20
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84975570635
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The samples were contained in a 2-mm path length cuvette and had absorbances of about 0.1 at 340 nm. An amplified Ti-sapphire-based laser system was used to pump an optical parametric amplifier to generate ∼300-fs, 680-nm pulses (frequency doubled with a potassium dihydrogen phosphate crystal to obtain 340-nm pulses) at a 1.36-kHz repetition rate. Samples were excited with 100 nJ of 340-nm light focused to a 250-μm spot. Absolute transient absorption changes were on the order of 0.01. The uncertainty of the kinetic data increases in the nanosecond regime. For a description of the laser system, see S. R. Greenfield, W. A. Svec, D. Gosztola, M. R. Wasielewski, J. Am. Chem. Soc. 118, 6767 (1996); S. R. Greenfield and M. R. Wasielewski, Opt. Lett. 20, 1394 (1995).
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Opt. Lett.
, vol.20
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Greenfield, S.R.1
Wasielewski, M.R.2
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21
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84991138979
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The stilbenedicarboxamide singlet state reduction potential is estimated to be ∼1.5 V from the sum of its singlet energy (3.4 V) and reduction potential in dimethyl sulfoxide solution [-1.9 V versus standard calomel electrode (SCE)] (15). The oxidation potential of dimethylaniline is 0.78 V versus SCE [D. Rehm and A. Weller, Isr. J. Chem. 8, 259 (1970)].
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(1970)
Isr. J. Chem.
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Rehm, D.1
Weller, A.2
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22
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33751552932
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N. Mataga, S. Nishikawa, T. Asahi, T. Okada, J. Phys. Chem. 94, 1443 (1990).
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J. Phys. Chem.
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Mataga, N.1
Nishikawa, S.2
Asahi, T.3
Okada, T.4
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26
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14444275037
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note
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Supported by the Division of Chemical Sciences, Office of Basic Energy Sciences, U. S. Department of Energy, under contracts DE-FG02-96ER14604 (to F.D.L.) and W-31-109-ENG-38 (to M.R.W.). We thank J.-S. Yang for the measurement of fluorescence decays.
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