用加脉冲梯度场的NMR自旋回波法测量高分子聚合过程中的自扩散系数

通过扩散系数的测量,可以了解高分子聚合反应整个过程的机理,进而控制聚合反应的进程。但能够测量高分子聚合过程中自扩散系数变化的仪器并不多。当前,加脉冲梯度场的自旋回波法被认为是最为有效和实用的方法^[1],此项研究围内尚未报道。     

自旋回波法测量弛豫时间

本文报导利用我们自己研制的ZHP—1型自旋回波谱仪测量弛豫时间的有关问题,目的是为了在近代物理实验中让学生: (1) 了解脉冲核磁共振的基本实验装置和基本物理思想,学会用经典矢量模型方法解释脉冲核磁共振中的一些物理现象;     

Analysis of femtosecond laser ionization/dissociation of polyatomic molecule C6H10O from one-colour pump-probe measurement

This paper reports that a one-colour fs pump-probe measurement has been carried out for studying photoionization/photodissociation of cyclohexanone (C6H10O) in intense laser field. Two of the fragments from cyclohexanone, C2H3+ and C3H3+ , are studied under 800 nm laser pump-probe and the results obtained show similar time evolutions. It proposes a feasible model for analysing the experimental observations of the one-colour fs pump-probe measurement. The results demonstrate that as an intermediate product, the excited molecular parent ions play a very important role in photionization/photodissociation processes in intense laser field.