Department of Physics , University of Crete , Herakleio , Greece.
Institute of Electronic Structure and Laser , Foundation for Research and Technology-Hellas , 71110 Heraklion-Crete , Greece.
J Phys Chem A. 2019 Sep 26;123(38):8130-8134. doi: 10.1021/acs.jpca.9b06372. Epub 2019 Sep 16.
We measure the magnetization quantum beats of spin-polarized hydrogen (SPH) and spin-polarized deuterium (SPD) with a pickup coil, from the UV photodissociation of HCl, HBr, and DI, in the 5-5000 mbar pressure range. The pressure-dependent depolarization rate is linear at low pressures and reaches a plateau at higher pressures. The high-pressure depolarization rate is observed to be proportional to the halogen nuclear electric quadrupole coupling constant. We also investigate how the presence of an inert gas, SF or N, affects the depolarization rate. The results are explained using a model in which depolarization occurs predominantly through an HY-H intermediate species (Y = Cl, Br, I).
我们使用拾波线圈测量了 HCl、HBr 和 DI 的紫外光解过程中自旋极化氢（SPH）和自旋极化氘（SPD）的磁化量子拍频，压力范围为 5-5000 毫巴。在低压力下，去偏振速率与压力呈线性关系，在高压力下达到一个平台。观察到高压力下的去偏振速率与卤素核电四极耦合常数成正比。我们还研究了惰性气体 SF 或 N 的存在如何影响去偏振速率。结果使用一个主要通过 HY-H 中间物种（Y = Cl、Br、I）发生去偏振的模型进行了解释。
