Rate long-component quenching

Long component quenching rate constants were measured for Ar, Np, and 02 over the pressure regions described above by (3). All CpO lifetimes and quenching rate constants are given in Table . 

TABLE IB QUENCHING RATE CONSTANTS FOR C fiV) LONG COMPONENT QUENCHING RATE CONSTANT QUENCHER GAS... 

Table 1. Decay rate constants (ki and k2) and rate constants for quenching of the triplet state of dyes K1-K3 and K4 by the nitroxyl radical in isopropanol solutions (kq) and of the long-lived component of the triplet state in the presence of DNA (kq(DNA)) in aqueous buffer solution (cdna = 2.5 x 10 mol 1 )...

Good performance was exhibited in the quench zone of the reactor and when used for the removable sleeve for supporting the hner. The low rate of corrosion was consistent with long component lifetime. 

Steady-state fluorescence spectra recorded after the addition of the NDI or PM I acceptor to the bisporphyrin tweezer ( rrl = 660 nm), demonstrated substantial quenching (75%) with increasing quantities of the NDI or PM I acceptors. Time-resolved emission spectra recorded in toluene for the complex 26 were biexponential containing a dominant short-lived CS components (80 ps, -95%) attributed to photoinduced ET from donor porphyrin to NDI, and a minor long-lived component (Ins, 5%). The lifetime of the dominant short-lived CS state is increased two- to threefold relative to covalently linked systems under similar conditions of solvent, donor-acceptor distance and thermodynamics [37]. Charge recombination rates from 1.4 to 3.8 x 1()9s 1 were observed, depending on whether the NDI or PM I acceptor was bound within the cavity. 

The rate constants, ( ), kq 2), corresponding to the quenching of the short- and long-lived components, were calculated as indicated in the text. 

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