Despite the large research effort that has been made, the microscopic processes of hydrogen chemisorption on graphite is not well understood. By ball milling graphite for a variety of different time periods under an atmosphere of hydrogen we have been able to assess the chemisorption of hydrogen as a function of milling time. Electron spin resonance (ESR) spectroscopy resolves two distinct paramagnetic components, the first is assigned to (intrinsic) delocalized π-electrons in the graphene sheets and the second to localized electrons. We request 3 days on TOSCA in order to further investigate the nature and structure of the hydrogen sorption on graphite as a function of milling time. The high neutron flux of the TOSCA diffractometer will enable us to understand the ratio of CH, CH2 and CH3 groups as a function of milling time and the effect of iron on the hydrogen sorption.