231should exhibit a linear relationship between two variables with different slopes but possibly with very nearly the same intercept. In order to improve on the precision of the slopes, a common intercept was assumed in the general least-squares adjustment using data for all compounds. Using the technique developed in this paper, the n + 1 square matrix (n = number of compounds) which would ensue from the general solution was reduced to the solution of 2n 2 X 2 matrices.Aclcnowledgments. The authors express their appreciation to the Robert A. Welch Foundation for the financial support of this work. Also, one of the authors (E. C.) is the recipient of a NASA Traineeship for predoctoral work in chemistry and is grateful for this assistance. Finally, we wish to express our appreciation to Miss Marie Cobb for hand calculations and assistance in preparing the programs and to Miss Elsie Bryan for assistance in preparing the manuscript.Electron paramagnetic resonance (epr) of Fea+ impurities in colorless topaz was measured at 77 and 300°K with X-band frequencies. The most intense peaks occurred at ~~~ (1) This work was supported by the U. 8. Atomic Energy Commission.
The inclusion of 0.05 to 20 mol% of α-hydroxyacetamide in single crystals of α-chloroacetamide has shown that the four line ESR pattern observed for x-ray irradiated α-chloroacetamide single crystals at 77 K is due to the alkoxy radical ⋅OCH2CONH2. The intensity of the four line ESR pattern is proportional to the concentration of α-hydroxyacetamide up to 1 mol% at which point it levels off and then decreases above 5 mol%. The alkoxy radical is not observed in pure α-hydroxyacetamide crystals.
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