[en] A solution model is described which permits calculation of the solubilities of the noble gases in liquid sodium. In contrast to earlier models, this model explicitly accounts for the effects of the conduction electrons in a liquid metal. Comparison of calculations with measurements shows that the model provides a fairly reliable calculation of the solubility of the noble gases in liquid sodium

[en] Quadricyclane isomerization is catalyzed by red-orange [Rh(NBD)(AcO)]₂ to give norbornadiene (75%) and two endo bis(norbornadienes), 1 (23%) and 2 (2%), at 25⁰C. The reaction is characterized by the formation and disappearance of yellow Rh(III) intermediates. In CH₂Cl₂ at 25⁰C the rate law -d[Q]/dt = (0.64 s^-1)[Cat]₀ adequately describes the results of kinetic studies carried out in the presence of large excesses of Q and NBD and with [Cat]₀ > 10^-4 M. At -50⁰C rhodocyclohexane intermediates in the formation of dimers were detected and characterized by ¹H and ¹³C]¹H] NMR spectra. The results are consistent with a stepwise mechanism involving insertion of Rh(I) into a cyclopropyl ring to form a rhodocyclobutane intermediate. 4 figures, 3 tables

[en] The solubility of xenon in liquid sodium was measured as a function of pressure (2-8 atm) and temperature (350-600⁰C). Henry's law was obeyed with the value of the Henry's law constant, K/sub H/ = N/sub Xe//P, ranging from 1.38 x 10^-10 atm^-1 at 350C, to 1.59 x 10^-8 atm^-1 at 600⁰C where N/sub Xe/ and P are the atom fraction and the partial pressure of xenon, respectively. The temperature dependence of solubility may be represented by log₁₀ lambda = (0.663 +- 0.01) - (4500 +- 73) T^-1, where lambda is the Ostwald coefficient (the volume of xenon dissolved per unit volume of sodium at the temperature of the experiment). The heat of solution of xenon in sodium was 20.6 +- 0.7 kcal/mole, where the standard state of xenon is defined as that of 1 mole of an ideal gas, confined to a volume equal to the molar volume of sodium

[en] The solubilities of the noble gases in liquid sodium have been the subject of considerable study in recent years. From measurements on helium, argon, and xenon a trend toward decreasing solubility with increasing size of the noble gas is observed. The paper reports on work to determine whether or not the solubility of krypton is consistent with this trend and to provide data for understanding the behaviour of fission product krypton in liquid metal cooled reactor systems. (Auth.)

[en] The investigation reported here was undertaken to obtain a better understanding of the nature of carbon in sodium systems. The solubility of carbon in sodium has been reported by Gratton (KAPL-1807 (1957)). Because of the uncertainties in the data, an effort was made to redetermine this solubility. Two sets of experiments were performed: one employed essentially the same experimental procedure used by Gratton, but with an improved analytical determination of total carbon; the other involved ¹⁴C as a tracer. In contrast to the earlier work, our results showed that the true solubility of elemental carbon in sodium is less than 0.005 ppm up to 450°C. The experiments indicated that liquid sodium usually contains significant amounts of dispersed carbon capable of passing through a 5μm stainless-steel filter. The amount of carbon passing through such a filter depends, among other factors, on the previous history of the sodium. Measures of the degree of dispersion of carbon in sodium were furnished by ultra-centrifugation and filtration experiments. The distribution of carbon among its various forms, i.e . dispersed elemental carbon, carbonate, carbide, etc., are discussed. (author)

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