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Alkalizing agents cyclohexylamine, morpholine, and hydrazine accelerate the base-induced decomposition of Fe(OH) 2 even at high pH levels by lowering the activation energy of the reaction. Efficient evolution of hydrogen is observed from Fe(OH) 2 suspension in the presence of hydrazine, while weakly stimulated evolution is observed in the presence of cyclohexylamine and morpholine. It appears that the concentration and complexing abilities of the additives critically determine the yield of hydrogen. Nickelcontaining surfaces such as NiO and Monel 400 † alloy (UNS N04400) apart from pure nickel also increase the H 2 yield from Fe(OH) 2 suspensions. These observations are related to corrosion occurring in the low-temperature portion of feedwater circuits of power plants.

A combination electron/ion field emission source will be described. For ion emission the source was operated as a conventional indium or gallium liquid metal ion source (LMIS), thereby giving a beam of principally In + or Ga + ions with the usual range of angular intensities and total emission currents. In the case of indium it was possible to "freeze in" the field stabilized Taylor cone formed during LMIS operation by carefully reducing the voltage to the threshold value and then rapidly reducing both the voltage and the emitter temperature. Field electron emission was then obtained by reversing the voltage polarity. The dc electron emission angular distribution generally overlapped that observed in the LMIS mode. This process, which was determined to be reversible and reproducible, will be discussed in detail.

SummaryA marked 'oxygen effect' is observed for several cobalt complexes in thermal annealing. Kinetic data are reported for recoil damage, afterIt is suggested that during an isothermal annealing run electrons are released from variable depth traps, and interact with the metastable species (damage centres) formed by virtue of interaction of recoil cobalt atom with a chelate molecule. The adsorbed oxygen on the surface acts as deep electron trap and suppresses annealing. Once it is displaced by N