首次研究了四极核弛豫速率的动态同位素效应,测定了12种简单有机分子及相应18种~2D同位素取代物中四极核~(17)O和~(14)N的弛豫速率R_1,并计算了这些分子的转动惯量张量的主值。结果表明,刚性小分子R_1的动态同位素效应与I的稳态同位素效应之间存在着必然的相关性。文中在核磁弛豫的理论中首次引入了碰撞频率和分子运动的平动-转动耦合的概念,从而对实验结果提出了合理的理论解释。 The dynamic isotope effect of the quadrupole nuclear relaxation rate was studied for the first time. The relaxation rate R_1 of ~ (17) O and ~ (14) N in the 12 simple organic molecules and corresponding 18 ~ 2D isotopic substitutions were determined. , And calculated the principal value of the moments of inertia of these molecules. The results show that there is a certain correlation between the dynamic isotope effect of R 1 and the steady-state isotope effect of I. The concept of translational-rotational coupling of collision frequency and molecular motion is introduced for the first time in the theory of NMR relaxation, and a reasonable theoretical explanation of the experimental results is proposed.