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The Absolute Abundance of the Chromium Isotopes in Some Secondary Minerals

Description: From abstract: "Isotopic assays have been made on the chromium in samples from fourteen different chrominiferous minerals from different geographic and meteoritic sources. The results of the assays indicate that it is not possible to unequivocally state that variations in isotopic compositions have been observed."
Date: 1962
Creator: Svec, Harry J. (Harry John), 1918-; Flesch, G. D. & Capellen, J.

Acid-Base Equilibria in Tertiary Butyl Alcohol

Description: From abstract: "The dissociation of acids in tertiary butyl alcohol has been studied by potentiometric, spectrophotometric, and conductimetric methods. Values for the over-all dissociation of perchloric and picric acids and several tetrabutylammonium salts were estimated by the Fuoss-Kraus treatment of conductance data. Potentiometric studies were carried out at constant ionic strength in order to minimize activity coefficient variations. An acidity scale was established from potentiometric measurements at a glass electrode, and conductance values of dissociation constants. A method was developed for the evaluation of the over-all dissociation constant of weak acids using potentiometric data for hydrogen ion activities and conductance data for the corresponding anion activities. Over-all dissociation constants are reported for perchloric acid, picric acid, 2,4-dinitrophenol, and benzoic acid. Apparent dissociation constants from potentiometric measurements at a constant ionic strength were determined for hydrobromic, nitric, hydrochloric, picric, and p-toluenesulfonic acids."
Date: August 6, 1962
Creator: Marple, Leland & Fritz, James S. (James Sherwood), 1924-

The Adsorption and Surface Reactions of Hydrocarbons on Clean Iridium

Description: From abstract: "The adsorption of ethane, ethylene and acetylene on clean iridium in a field emission microscope has been found to cause characteristic changes in the work function of the iridium surface. Further changes, which are time and temperature dependent, result when such surfaces are heated. Flash filament experiments have shown that the changes in work function upon heating are due to desorption reactions and that the desorbed product consists principally of hydrogen. By assuming a linear relationship between surface coverage and work function, it has been possible to determine the desorption kinetics from the observed rates of work function change at various temperatures. The results are consistent with a mechanism involving stepwise surface dehydrogenation in which a pair of hydrogen atoms is removed from the hydrocarbon molecule in each step, followed by desoption of the adsorbed hydrogen. At very high temperatures the remaining carbon atoms are removed, presumably by evaporation."
Date: April 7, 1962
Creator: Arthur, John R., Jr. & Hansen, Robert S.

Analysis of Carbon Monoxide-Nitrogen Mixtures by High Resolution Mass Spectrometry

Description: From abstract: "A single focusing mass spectrometer has been converted into a double focusing instrument. Relatively high resolution is obtained by decreasing the slit widths and minimizing the ion-optic aberrations. A relatively low ion accelerating voltage (2000 volts) is utilized compared to those normally used for high resolution work. The entire construction was performed at these laboratories. Essentially all of the original equipment was reused in the double focusing system. Although the original source slit was decreased from 10 to 0.4 mils and the source α value was decreased from 0.04 to 0.008 radians, sufficient sensitivity is obtained for quantitative gas analysis with the ordinary electrometer tube amplifiers utilizing 4 x 10[^]10 ohms input grid resistors and 100 per cent inverse feedback. Carbon monoxide-nitrogen mixtures were analyzed quantitatively. The results indicate that direct quantitative analysis can be obtained on mixtures ranging from 99 per cent to 10 per cent carbon monoxide in nitrogen. Analysis of lower percentages may be made possible through indirect reading of the peak should it be necessary. It appears that the instrument should be adaptable to research problems concerning these two gases. The immediate problem posed is the analysis of oxygen and nitrogen in metals. Other applications may be possible such as analysis of metastable fragment ions of hydrocarbons or identification of doublet peaks requiring high resolution."
Date: February 1962
Creator: Conzemius, Robert Joseph & Svec, Harry J. (Harry John), 1918-

Analysis of Mixtures of Alcohols by Acylation

Description: From abstract: "Recently a general chemical method for the analysis of mixtures of alcohols appeared, using pyridine catalyzed acetylation and second order kinetics to determine the amount of the faster reacting component. The use of 0.25M isobutyric anhydride in pyridine containing 0.0025M perchloric acid as catalyst promotes the rate of the reaction and diminishes the time necessary to perform an analysis. A mathematical treatment of the data and kinetic plot reduces the number of kinetic points to only four or five. The mixtures are primarily composed of isomers."
Date: November 1961
Creator: Fellows, William Dean & Fritz, James S. (James Sherwood), 1924-

Angular Distribution of Relativistic Atomic K-Shell Photoelectrons

Description: From abstract: "Using the high energy limit of the exact Coulomb wave function for the outgoing electron, the differential cross section, correct to three orders in aZ, is calculated for the K-shell photoeffect. An analytic expression, exact in aZ, is obtained for the differential cross section for the special case in which the electron emerges in the forward direction."
Date: 1962
Creator: Weber, T. A. & Mullin, C. J.

The Application of Wax Laps to Vibratory Polishers

Description: From introduction: "In this paper the adaptation of the wax lab surface vibratory polisher is described. The wax lap requires little maintenance during the life of the lap. It is not necessary to remove any of the holding devices on the bowl to clean and recondition the lap. The bowl is merely washed out, recharged and placed in operation. The wax lap will not wrinkle or tear, nor is it necessary to change it each day such as the silk or nylon cloths."
Date: April 19, 1962
Creator: Hopkins, E. N. & Peterson, D. T.

Automatic Recording Surface Balance

Description: From introduction: "We have previously described simple modifications of a 'Cenco' hydrophil balance which allowed automatic recording of monolayer compression characteristics. This note describes the torsion balance and trough designed and built in this Laboratory as a result of our experience with the previous instrument."
Date: 1962
Creator: Mann, J. Adin, Jr. & Hansen, Robert S.

Bismuth

Description: This report provides a broad and in depth discussion of bismuth, discussing the properties of bismuth--including physical, electrochemical, and chemical properties. It then discusses the processes by which bismuth is detected and how bismuth can be separated and isolated, with discussions of dissolution, precipitation, and extraction.
Date: 1960
Creator: Fritz, James S.

Boiling Points and Surface Tensions of Mixtures of Benzyl Acetate With Dioxan, Aniline and Meta-Cresol

Description: Technical report. From Abstract : "Accurate measurements on boiling points and surface tensions of mixtures of benzyl acetate with dioxan, aniline and meta-cresol over the entire range of concentration are reported. The results have been analysed in terms of quasi-crystalline model which is partially successful in representing the composition dependence of heats of mixing, boiling points and surface tension except for composition dependence of boiling points of benzyl acetate and meta-cresol."
Date: September 13, 1962
Creator: Katti, P. K. & Chaudhri, M. M.

Calcium

Description: Technical report outlining the element calcium as well as its occurrences, physical properties, chemical properties, methods of manufacture, economic aspects, and uses.
Date: September 1962
Creator: Carlson, O. N. & Haefling, J. A.

Cation Exchange Separation of Divalent Metal Ions From Rare Earths

Description: From abstract: "The divalent metal ions of calcium, magnesium, nickel, and strontium are eluted from a cation exchange column with 1.5M nitric acid and separated from trivalent rare earths, aluminum and yttrium. Prior sequential elution of other metal ions with hydrochloric acid in acetone-water or with dilute hydrofluoric acid does not interfere with the present separation method."
Date: June 6, 1962
Creator: Fritz, James S. (James Sherwood), 1924- & Garralda, Barbara B.

Chapter 48: Analytical Chemistry of Cobalt

Description: This report provides a detailed discussion of the analytical chemistry of cobalt, including an introduction, the properties of cobalt, the sampling of cobalt-bearing materials, the separation and isolation of cobalt, the detection and identification of cobalt, the determination of cobalt, and the specific methods for determining cobalt.
Date: 1961
Creator: Dale, John M. & Banks, Charles V.

Crystal Structure of Bis (Meta-Chlorobenzoyl) Methane

Description: Technical report. From Abstract : "The determination of the crystal structure of bis(meta-chlorobenzoyl)-methane was undertaken by x-ray methods in an effort to clarify the ambiguous position of the hydrogen atom on the enolic form of β - diketones and hence in intramolecular hydrogen bonds."
Date: November 1962
Creator: Engebretson, Gordon Roy & Rundle, R. E.

The Crystal Structure of Bis(Meta-Chlorobenzoyl) Methane

Description: Technical report. From Abstract : "The crystal structure of bis(meta-chlorobenzoyl) methane has been determined by three dimensional anisotropic least squares refinement of scintillation counter data. The molecule was found to be nearly planar with a maximum deviation from the least squares molecular plane of 0.068Å and an average deviation of 0.023Å. Fourier transform techniques to locate phenyl rings provided the key to the structure determination. The intramolecular bond distances and thermal parameters of the oxygen atoms support a resonant, enol ring with a symmetric, intramolecular hydrogen bond. The structure confirms conslusions from the structure of bis(meta-bromobenzoyl) methane where the symmetry of the molecule was forced by the crystal symmetry."
Date: December 13, 1962
Creator: Engebretson, Gordon R. & Rundle, R. E.

The Crystal Structure of Bismuth Subchloride

Description: Technical report. From Abstract : "The stoichiometric formula of the lower chloride in the BiCl3-Bi system has been established as Bi12Cl14 (BiCl1.167) through a dingle crystal, X-ray determination of its structure. ... Previous studies of the Bi-Cl3-Bi system are re-examined in the light of the structural results."
Date: January 10, 1963
Creator: Hershaft, Alex & Corbett, John D.

The Crystal Structure of LiCuCl3-2H2O*

Description: This report undertakes research to study LiCuCl3-2H2O is from a structural standpoint, revealing the oxygen positions. The study uses the Levy-Bussing anisotropic temperature factor treatment and least squares program to determine a discrepancy factor for the visually determined intensities. The structure of the molecule is also found to have interesting magnetic properties which has inspired a new study at Brookhaven.
Date: 1960
Creator: Vossos, Peter H.; Fitzwater, D. R. & Rundle, R. E.

Design and Test of a Diaphragm Pump for Liquid Metals

Description: Technical report. From Abstract : "Details are provided on the construction and operation of a two-stage diaphragm pump successfully used for the first time in liquid metal service. From the results of 5,376 hr. test of the pump it was concluded that it is well suited to the pumping of liquid metals at low flow rates where pulsating flow can be tolerated and also where remote operation is required. Operating temperatures and pressures are limited only by the availability of suitable materials of construction."
Date: April 12, 1963
Creator: Westerheide, D. E. & Clifford, J. C.

Discussion of Quadrupole Precession

Description: From abstract: "In this paper the motion of a nucleus with an intrinsic quadrupole moment in an external electrostatic field gradient is discussed from a classical point of view. It is shown that in the classical approximation the angular momentum may precess about the direction of strongest field gradient or about the direction of intermediate field gradient, but not about the direction of weakest field gradient. The classical precession frequencies are found to be related to the quantum mechanical dipole transition frequencies."
Date: May 31, 1962
Creator: Raich, J. C. & Good, R. H. (Roland Hamilton), 1923-

Effect of Oxygen on Mechanical Properties of Niobium

Description: From abstract: "The effects of oxygen on some mechanical properties of niobium were studied over the composition range of 20 ppm to 2400 ppm oxygen. The tensile properties of samples of these compositions were studied over the temperature range from room temperature to 500°C. Hardness values were obtained at room temperature only. The following observations and conclusions were made during these studies: 1. Oxygen additions to high purity niobium increase both the yield and tensile strengths of niobium at all temperatures investigated. As the temperature is increased above 250°C the effect of the first 200 ppm of oxygen has more influence than further additions on these strengths of niobium. 2. Strain aging behavior is observed. The peaks in the tensile strength versus temperature curves can be predicted with reliability by the relationship proposed by Cottrell, 3. A mechanism is proposed which, along with Cottrell's segregated atmosphere mechanism, can account for the serrated stress-strain curves obtained. This mechanism offers an explanation of the occurrence of serrations at room temperature, and the mechanism is composition dependent."
Date: May 1962
Creator: Neubauer, Edwin Paul & Wilhelm, H. A.