SynopsisA variety of measurements indicate that thermosetting epoxy polymers contain closely packed floccules and an interstitial liquid similar to the starting materials. The floccules are thought to be of colloidal origin and appear to be ordered with respect to each other in a three-dimensional array.

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As part of the program to develop a large-area thin-film pulse heater for a lithium ion source, the residual stress in post cathode magnetron sputter deposited molybdenum films has been studied. It was found that in films prepared in the low-pressure sputtering regime, the residual film stress is very sensitive to the gas pressure during sputtering and that the film stresses are highly anisotropic. The transition pressure for changing from compressive to tensile residual stress, as defined by Thornton and Hoffman, depends on the relationship between the measurement direction in the film and the post cathode orientation. In order to deposit a nearly stress-free film a pressure cycling technique was developed which deposited alternate film layers containing tensile and compressive stresses. Film resistivity and thermal coefficient of resistivity measurements were made during the pulse heating of the molybdenum films.

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The spectra of liquid ammonia solutions of the alkali and alkaline earth iodides, except Ca12, exhibit an absorption band at about 2500 A, the position and intensity of which is temperature dependent; the position of the band is also dependent upon the concentration of added inert salt. Analysis of the data indicates that the band arises from a chargetransfer-to-solvent transition. The absence of this band in solutions of CaIz suggests that a molecular complex is present in this system. IntroductionThe position of the first ultraviolet absorption band for the iodide ion is solvent and temperature dependent; this band has been described as arising by a charge-transfer-to-solvent (ctts) mechanism.' We present here the results of a detailed study of the ultraviolet absorption band reported2 for iodide ions in liquid ammonia which support this model.