Fig. 4.
(A) Pressure curve of combustion reaction of a 5% Kr/95% H2 gas mixture with 11.2 ± 4 kPa O2 added after 12 s causing the reaction and observed pressure drop. Average initial partial pressure of H2 = 23.5 ± 1 kPa. (B) Normalized integrated hp 83Kr NMR signals following a 12° pulse during the combustion reaction adding 13.4 ± 0.4 kPa (red circles) and 20.5 ± 0.5 kPa (green triangles) partial pressure of oxygen. Average initial partial pressure of H2 = 27.5 ± 2.5 kPa. Black open circles show control signals for a 5% Kr/95% H2 gas mixture with no combustion. Signal intensity data were corrected for flip-angle attenuation and are the average from three repeat measurements.