A Determination of the Ratio of the Specific Heats of by Shields M. C. PDF

By Shields M. C.

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Additional info for A Determination of the Ratio of the Specific Heats of Hydrogen at 18 and -190C

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8b). 's mentioned in this section correspond to those for a {Ill} plane in a face center cubic metal. 32 Chapter 4 3. N. =6, Fig. 8c). 4. =9, Fig. 8d). Such direct transfers to growth sites are not necessarily the only ways in which an ion can reach a site of growth. A priori, there is clearly more likelihood that the ion will first land at a plane site (Fig. la) than at any other, because there are many more such sites than any other. " 4. WHA T HAPPENS TO THE HYDRATION SHEATH DURING THE ATOMIC MOVEMENTS BETWEEN ARRIV AL IN THE DOUBLE LAYER AND BUILDING INTO THE LATTICE?

Whether two charges may be transferred in one step (which might be a rate-determining step). , charge transfer by the model described in Section 2 of this chapter, but involving two electrons ejected from the metal and reaching the transition state simultaneously) is negligible. Hence, Cu2+ + 2e - Cu must take place in separate steps. * * In fact, it was shown61 that the rate-determining step at potentials not too near the reversible potential was the one electron charge transfer, Cu2+ + e -+ Cu+.

62 Some authors state that "dehydration" of cations is rate-determining, but this view is not tenable because the heat of activation for total dehydration before transfer of an electron to the transition state is about one-half the first ionization energy of the ion-considerably greater than that calculated by the detailed process discussed by Conway and Bockris. 63 Hence, the rate constant for a discharge process involving the formation of a dehydrated ion is negligible. * The ions which take part in the charge-transfer process are seldom simple, because simple cations of Groups IA and IIA in the Periodic Table occur well above H in the electrochemical series so that H2 tends to be evolved first if attempts are made to deposit these metals; most other cations are complex forming.

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A Determination of the Ratio of the Specific Heats of Hydrogen at 18 and -190C by Shields M. C.


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