Pressure Dependent Wall Relaxation in Polarized $^3$He Gaseous Cells
Abstract
Pressure dependence of longitudinal relaxation time (T) due to the cell wall was observed previously at both room temperature and low temperature in valved Rb-coated refillable He gaseous cells in \cite{Zheng2}. The diffusion of He from measurement cell through a capillary tube to the valve and the subsequent depolarization on the surface of the valve was proposed to possibly explain such a pressure dependence at room temperature \cite{Saam}. In this paper, we investigate this diffusion effect through measurements of T with newly designed Rb-coated Pyrex glass cells at 295 K as well as finite element analysis (FEA) studies. Both the experimental results and FEA studies show that the diffusion effect is insufficient to explain the observed linear pressure-dependent behavior of T.
Keywords
Cite
@article{arxiv.1303.0583,
title = {Pressure Dependent Wall Relaxation in Polarized $^3$He Gaseous Cells},
author = {C. Peng and W. Zheng and P. -H. Chu and H. Gao and Y. Zhang},
journal= {arXiv preprint arXiv:1303.0583},
year = {2013}
}