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Ultrahigh Vacuum Techniques

Description: "Activities in an investigation of basic phenomena associated with particle interactions at surfaces are reported. Development of components, which may be of interest to others working in ultrahigh vacuum research, for use in the research program is described. Work in development of components and techniques was directed toward investigations of non-refrigerated traps, a cryogenic pump using liquid He, and development of electron sources. Research on interaction of particles at surfaces was dev… more
Date: unknown
Creator: Fox, R. E.; Lange, W. J. & Singleton, J. H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Ultrahigh Vacuum Techniques

Description: "Further experiments with the zeolite traps using both nude'' and tubulated ion gages indicates an appreciable amount of untrapped vapors passing through the unrefrigerated zeolite. The exact nature of this vapor was not determined. Investigations of the all stainless steel vacuum system indicate that the large source of desorbed H/sub 2/ is that adsorbed in the walls. Other work is reported on low temperature cathodes and construction of an ionization gage incorporating a SiC emitter and an el… more
Date: unknown
Creator: Fox, R. E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Ultrahigh Vacuum Techniques

Description: "Investigations were continued with zeolite traps. Results indicate that certain gases are not trapped by zeolite and must be removed by ion pumping. In experiments to obtain a cold electron source ion gage, output electron currents of several milliamperes were obtained using SiC in conjunction with an electron multiplier. Fundamental surface reaction studies were continued on photodesorption of CO from W, O adsorption on W, H solubility in W, and inelastic collisions of electrons at surfaces."
Date: unknown
Creator: Fox, R. E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Ultrahigh Vacuum Techniques

Description: "The use of SiC in conjunction with an electron multiplier was found to offer good possibilities for a cold electron ion gage. A helium cryopump with 50 1/sec pumping speed was developed that is capable of maintaining a static system at pressures below approximates 5 x 10/sup -11/ torr with only about one liter of liquid helium every 8 hr. Additional results are reported in photon desorption experiments from tungsten and glass, hydrogen absorption on tungsten, and oxygen adsorption on tungsten.… more
Date: unknown
Creator: Fox, R. E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Ultrahigh Vacuum Techniques

Description: "Mass spectrometer monitoring of peaks upon flashing the target in measurement of CO photodesorption from W indicates bulk heating to be a main contribution to desorption. Study of auger electron ejection from absorption of O on W yields good agreement between calculated and measured values for electron ejection. Values for O adsorption on W are compared with other determinations, and wide variations in sticking probabilities are noted. Measurements of the conversion of O incident on W ribbons … more
Date: unknown
Creator: Fox, R. E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Ultrahigh Vacuum Techniques

Description: "The photodesorption of gases from metals by uv photons has been studied with a high sensitivity mass spectrometer. A program to develop low-temperature cathodes is underway to study hydrogen interactions at various surfaces. Preliminary results on the degassing characteristics of an all metal system have been obtained."
Date: unknown
Creator: Fox, R. E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Ultrahigh Vacuum Techniques

Description: "Investigations were continued on the characteristics of zeolite traps and on a small cryopump. Studies of an all metal vacuum system indicated that this system is superior to glass systems when operated at elevated temperatures. The major contribution to the gas evolution is hydrogen. The characteristics of an electron multiplier operating under ultrahigh vacuum procedures were studied. The desorption of gas by photons is being investigated."
Date: unknown
Creator: Fox, R. E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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The Use of Cupferron in Inorganic Analysis with Special Reference to the Determination of Uranium. I. Introduction. The Properties of Various Cupferrates

Description: A summary of works of numerous investigators who have studied the properties and the analytical applications of cupferron, phenyl nitroso hydroxylamine ammonium are presented.
Date: unknown
Creator: Furman, N. Howell (Nathaniel Howell), 1892-1965 & Mason, W. B. (William Burkett)
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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The Use of Cupferron in Inorganic Analysis with Special Reference to the Determination of Uranium. II. The Factors that Control the Extraction of Various Elements from Aqueous Solution by Cupferron Plus an Organic Solvent

Description: A generalized formulation of the relations that apply to the extraction of an element by cupferron plus an organic solvent is desirable in choosing the conditions favorable to the process.
Date: unknown
Creator: Furman, N. Howell (Nathaniel Howell), 1892-1965 & Mason, W. B. (William Burkett)
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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The Use of Cupferron in Inorganic Analysis with Special Reference to the Determination of Uranium. III. The Isolation of Uranium as the Quadrivelent Cupferrate.

Description: Quadrivalent uranium is precipitated by cupferron in acidic solutions. The precipitate is soluble in organic solvents such as chloroform or either.
Date: unknown
Creator: Furman, N. Howell (Nathaniel Howell), 1892-1965; Mason, W. B. (William Burkett) & Pekola, J. S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Utilization of Radioactive Isotopes in Coal Process Research

Description: "The experimental technique was checked out and the equipment put in working order for the study of the capacity and efficiency of the hydraulic cleaning of coal by water fluidization. The method to determine operating capacity consists of determining the segregation rate by dynamic tracing of radioactive mineral impurities of various size and density ranges, that are injected into the fluidized bed of coal. The equilibrium position of the injected tracer in the fluidized bed of solids is also … more
Date: unknown
Creator: Yavorsky, P. M. & Gorin, E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Utilization of Radioactive Isotopes in Coal Process Research

Description: "Experiments are continuing to determine the cleaning efficiency and rate of cleaning of fine size bituminous coals by the water fluidization method. By radio-tracing neutron activated pyrites, data were obtained on the rate of segregation of mineral impurities from the coal as a function of particle size and density in a 48 x 0 mesh hydraulic fluidized coal bed. Two methods of radio- tracing were demonstrated. The ultimate cleaning efficiency of the above size coal is also reported."
Date: unknown
Creator: Yavorsky, P. M. & Gorin, E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Vanadium Salt Roasting Studies

Description: The test work showed that three variables were important in obtaining good vanadium extractions. These variables were 1) the concentration of salt, 2) the roasting time, and 3) the temperature. In general, eight percent salt, 850'C, and 45 minutes roasting time are the optimum conditions for vanadium extraction by salt roasting methods.
Date: unknown
Creator: Stanley, Alan
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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