Bitte wählen Sie ihr Lieferland und ihre Kundengruppe
For the mean activation energy for the reactions H + D sub 2 implies HD + D and D + H sub 2 implies H + D, new experiments have given an apparent value in the neighborhood of 3.9 kcal, which is closer to the real value than the previously obtained value. The inhibiting effect of NH sub 3 has been confirmed, and the magnitude of the decrease in the initial rate has been found to behave as an increasing function of the inhibitor concentration. Although the experiments were too imprecise and too few to constitute a rigorous verification of the theoretical equations concerning the inhibition, the experiments seem to provide a qualitative confirmation of these equations. As the temperature rises, the degree of inhibition decreases, which can be explained if it is assumed that the NH sub 3 molecules are bound to the H (or D) atoms only by van der Waals forces. This hypothesis can also be supported by the fact that if deuterium which contains approximately 1 percent ammonia is irradiated with alpha rays the ammonia, as shown by spectrographic analysis, does not undergo appreciable replacement of the hydrogen by the deuterium. (ERA citation 02:049274)