Robinson B H, Haas D A, Mailer C
Department of Chemistry, University of Washington, Seattle 98195.
Science. 1994 Jan 28;263(5146):490-3. doi: 10.1126/science.8290958.
Time domain pulsed saturation recovery and electron-electron double resonance spectroscopies were used to measure the spin-lattice relaxation rates of the electron and the nitrogen nucleus in nitroxide spin labels in liquids. The rotational correlation time range covered is from picoseconds to milliseconds. These rates are quantitatively explained by isotropic rotational Brownian dynamics, which modulate the interactions between the electron spin and the molecular angular momentum; the nitrogen and electron spins; and the solvent protons with both the electron and the nitrogen spins. This solves a 20-year-old problem that has limited scientific applications of nitroxides.
时域脉冲饱和恢复和电子-电子双共振光谱法被用于测量液体中氮氧自旋标记物中电子和氮原子核的自旋-晶格弛豫速率。所涵盖的旋转相关时间范围从皮秒到毫秒。这些速率可以通过各向同性旋转布朗动力学进行定量解释，该动力学调节电子自旋与分子角动量之间的相互作用；氮和电子自旋之间的相互作用；以及溶剂质子与电子和氮自旋之间的相互作用。这解决了一个存在20年之久且限制了氮氧化物科学应用的问题。
