On the Heterogeneous Ortho- Paraconversion on Paramagnetic Crystals
- 1 March 1940
- journal article
- conference paper
- Published by AIP Publishing in The Journal of Chemical Physics
- Vol. 8 (3) , 248-251
- https://doi.org/10.1063/1.1750638
Abstract
The rate of conversion of parahydrogen and of orthodeuterium is measured on paramagnetic crystals, viz., CuSO4, NiCl2 and neodymium oxalate. In the last case, crystals of approximately uniform size were used so that the total converting area was known. The conversion rate has a maximum at 0°C and it is shown that below this temperature the desorption rate of the H2 and the D2 is rate‐determining. Hence, the ratio of the rates for H2 and D2 is not far from unity. The rate of desorption increases with increasing temperature and at higher temperatures, the rate of conversion on the surface becomes the slow process. The ratio of the rates for H2 and D2 becomes nearly 11 in this region. The heat of adsorption of the hydrogen on neodymium oxalate is about 2.4 kcal./mole.Keywords
This publication has 6 references indexed in Scilit:
- On the Paramagnetic Conversion of Parahydrogen and Orthodeuterium in the Presence of Nitrous Oxide (The Magnetic Moment of the Deuteron)The Journal of Chemical Physics, 1938
- Experiments on heavy hydrogen. VI. The ratio of the magnetic moment of the proton to the magnetic moment of the deuteronProceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences, 1935
- On the theory of the catalysis of the ortho-para transformation by paramagnetic gasesProceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences, 1935
- The Spin-Isomerization of Hydrogen at Paramagnetic and Diamagnetic SurfacesJournal of the American Chemical Society, 1935
- Experiments on heavy hydrogen. II.―The ortho-para conversionProceedings of the Royal Society of London. Series A, Containing Papers of a Mathematical and Physical Character, 1934
- Experiments on heavy hydrogen.―Part IProceedings of the Royal Society of London. Series A, Containing Papers of a Mathematical and Physical Character, 1934