We have observed a linear pressure dependence of longitudinal relaxation time (T1) at 4.2 K and 295 K in gaseous 3He cells made of either bare pyrex glass or Cs/Rb-coated pyrex due to paramagnetic sites in the cell wall. The paramagnetic wall relaxation is previously thought to be independent of 3He pressure. We develop a model to interpret the observed wall relaxation by taking into account the diffusion process, and our model gives a good description of the data.
@article{arxiv.1203.3897,
title = {Pressure Dependence of Wall Relaxation in Polarized $^3$He Gaseous Cells},
author = {W. Zheng and H. Gao and Q. Ye and Y. Zhang},
journal= {arXiv preprint arXiv:1203.3897},
year = {2012}
}