Temperature dependent lineshape changes in solid H2 for low oH2 concentrations

The nmr lineshape due to unpaired oH₂ molecules in solid pH₂ changes significantly below 0.2 K. A deconvolution of lineshape based on a mitional narrowing model yields the relative amplitude of the part of the signal showing resolved structure as well as the temperature dependence of the frequency determining parameter. Both the relative amplitude of this signal and the temperature at which structure appears decrease with increasing oH₂ concentration.