New vapor pressure data for cobalt have been obtained in the temperature range 1519-1926°K fromKnudsen effusion experiments. The derived third-law heat of vaporization of cobalt is 6.H298o== 101.0±0.6 kcal/mole. Plausible explanations are presented that account for the widely differing vapor pressure data and heats of sublimation published in the literature. It is shown that the evaporation coefficient for cobalt is essentially unity rather than 3X1

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A nude ionization gauge adjacent to the closed ion-source chamber of a quadrupole mass spectrometer is a sensitive detector of the total amount of gas introduced for dynamic analysis. Linear relations between the amount of gas and the area of the ionization gauge pulse record were found for eight gases. For relatively unreactive gases, linearity extended to the smallest samples that could be detected, approximately 10−10 atm cm3. Validity of the dynamic method of analysis was established by demonstrating that the same response was obtained for pulsed and for continuous sample introductions from calibrated leak sources of each of the eight gases.