Gudkov N D, Stolovitskiĭ Iu M, Evstigneev V B
Biofizika. 1978 Jul-Aug;23(4):571-4.
The values of absolute quantum yield phi of the formation of free ion-radicals during the illumination of alkohol solutions of chlorophyll alpha (Chl) and rho-benzoquinone (Q) at room temperature were obtained by the method of impulse photoconductance. With an increase of the dielectric constant epsilon of the solvent from approximately 6 to approximately 25 phi increases by two orders ( approximately 10(-3)--approximately 10(-1). That obtained relationship phi (epsilon) is explained by epsilon effect on the efficiency of dissociation of "solvent-shared" ion-radical pair Chls+. Os-. The comparison of experimental data and theoretically expected ones allowed the estimation of some parameters to be obtained which characterize the ion-radical pair: interionic distance (10 A), the dissociation velocity constant ( approximately 10(5)--10(8) s-1), the velocity constant of reverse electron transfer (10(8) s-1), the life time approximately 10(-8) s).
在室温下，通过脉冲光电导法获得了叶绿素α（Chl）和ρ-苯醌（Q）的醇溶液光照过程中自由离子自由基形成的绝对量子产率φ值。随着溶剂介电常数ε从约6增加到约25，φ增加了两个数量级（约10⁻³ - 约10⁻¹）。所得到的φ(ε)关系是由ε对“溶剂共享”离子自由基对Chls⁺·Os⁻解离效率的影响来解释的。实验数据与理论预期数据的比较使得能够获得一些表征离子自由基对的参数：离子间距离（10 Å）、解离速度常数（约10⁵ - 10⁸ s⁻¹）、反向电子转移速度常数（10⁸ s⁻¹）、寿命约10⁻⁸ s。
