电多极相互作用引起的静态能量传递中施主发光衰减与受主浓度的关系

本文指出,通常用于描述电多极相互作用引起的静态传递模型中时间足够长时施主发光衰减规律的表示式exp[-γt-CA(X0t)3/s)Г(1-3/s)]应该用exp[-γt-CA·A(CA)(X0t)2/sГ(1-3/s)]/(1-CA)来代替;文中还指出,静态有序阶段的时间上限由X0t

THE DEPENDENCE OF THE DONOR FLUORESCENCE DECA Y ON ACCEPTOR CONCENTRATION IN STATIC ENERGY TRANSFER CA USED BY ELECTRIC MULTIPOLE INTERACTION

It is well known that if donor-donor transfer can be omitted, the energy transfer between donors and acceptors can be described by static model[1,2]. In this case the decay of the donor fluorescence can be expressed by F(t)=exp(-γt)f(t)=exp(-γt)exp[ΣIn(1-CA+CA exp(-X0t))],(2) where γ is the intrinsic decay rate of the donor, CA is the concetration of the acceptor, X0n is the transfer rate between the donor at the origin and the acceptor at the site n, the summation is taken over all cells. With the approximation of isotropic contineous medium and CA <<1, it was shown[1,2,3] for electric multipole interaction lnf(t)=-CA (X0t)3/sΓ(1-3/s), (4) where X0 is the D-A transfer rate at the separation R0, the radius of the Wigner-Seitz sphere. This expression is valid if X0t>>1.If CA <<1 is invalid, more terms should be taken in the expansion of (2). It is shown in this paper, that (4) must be modified by lnf(t)=-1n(l-CA)-A(CA)CA (X0t)3/sΓ(l-3/s), (7).