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350. Threshold ionization of HCl by electron impact
Abstracts 342--360
357
Materials and Techniques used in Vacuum Technology 40.
4O
G a s e s and V a p o u r s 40
342. Calorimetric Heat of Adsorption--Nitrogen on Tungsten. P. Kislink, J. Chem. Phys., 31, 1605-1611, Dec. 1959. 40 343. Total Collision Cross Sections for the Interaction of Atomic Beams of Alkali Metals with Gases. Erhard W. Rothe and Richard B. Bernstein, J. Chem. Phys., 31, 1619-1627, Dee. 1959. 40 Containing
344. Studies of the Evaporation of Condensates Nitrogen Atoms. The products of an electrodeless discharge in nitrogen or mixtures of nitrogen in neon or argon were condensed at 4.2°K. The products evolved from this condensate when it was allowed to warm up slowly were continuously analyzed by means of a mass spectrometer having a lower detection limit of 2 × 10 -s mm of nitrogen atoms. Experimental evidence is presented for the presence of nitrogen atoms in the warm-up products. It was estimated that less than 10 -3 per cent of the nitrogen atoms originally condensed could be recovered. (Author) John T. Herron and Vernon H. Dibeler, J. Chem. Phys., 31, 1662-1665, Dec. 1959. 40 345. On Chemical Reactions in Free Molecule Flow. This paper deals with heterogeneous chemical reactions within systems in which the relevant geometric dimensions are small compared with the mean free path of gas molecules. A typical example can be found in a surface reaction occurring at moderate pressures inside the pore of a catalyst with a radius of several angstroms. Specific problems of this type have in the past been formulated, subject to the well-known limitations of ordinary diffusion theory, in terms of differential equations for the species concentrations. This in turn supposes that the reaction pattern is dependent on local conditions. A more general and exact formulation given in the following shows that the concentration of a molecular species at a point is determined by the concentration distributions of all species stemming from the entire system. Thus one is led to a formulation in terms of integral equations. In an application of the theory the validity of the conventional differential equation approach is investigated and is found to yield satisfactory results only under certain limiting conditions. (Author) Paul L. Chambre, J. Chem. Phys., 32, 24-27, Jan. 1960. 40 346. Negative Ion Formation in NO2 by Electron Attachment. R. E. Fox, J. Chem. Phys., 32, 285-287, Jan. 1960. 40 347. Pressure Induced Shifts of HCI Lines Due to Foreign Gases. Note by D. H. Rank, W. B. Birtlay, D. P. Eastman, and T. A. Wiggins, J. Chem. Phys., 32, 296-297, Jan. 1960. 4O 348. Pressure Induced Shifts of HCI Lines Due to Foreign Gases. Note by M. A. Hirshfeld, J. H. Jaffe, and S. Kimel, J. Chem. Phys., 32, 297-298, Jan. 1960. 40 349. Pressure Shifting of Spectrum Lines : Some Empirical Generalizations. Note by D. H. Rank, W. B. Birtley, D. P. Eastman, and T. A. Wiggins, J. Chem. Phys., 32, 298-299, Jan. 1960,
350. Threshold Ionization of HCI by Electron Impact. R. E. Fox, J. Chem. Phys., 32, 385-386, Feb. 1960. 4O 351. Thermal Conductivity of Binary Mixtures of Diatomic and Monatomic Gases. B. N. Srivastava and A. K. Barua, J. Chem. Phys., 32, 427-435, Feb. 1960. 40 352. Molecular Diffusion Studies in Gases at High Temperature. IV, Results and Interpretations of the COz-O2, CH-O.2, H ~ O , , CO-O~ and H 2 0 - O 2 Systems. R. E. Walker and A. A. Westenberg, J. Chem. Phys., 32, 436-442, Feb. 1960. 40 353. Infrared Emission Spectra of Gaseous B203 and B~O2. David White, David E. Mann, Patrick N. Walsh, and Armin Sommer, J. Chem. Phys., 32, 481-487, Feb. 1960. 40 354. Infrared Emission Spectrum of Gaseous HBO2. David White, David E. Mann, Patrick N. Walsh, and Armin Sommer, J. Chem. Phys., 32, 488-492, Feb. 1960. 40 355. Excitation of the Auroral Green Line in Nitrogen Afterglows. R. A. Young and K. C. Clark, J. Chent. Phys., 32, 607-611, Feb. 1960.
356. Vibrational Distribution in Late Nitrogen Afterglows. R. A. Young and K. C. Clark, J. Clwm. Phys., 32, 604-604, Feb. 1960. 40 357. Formation of Excited N O and N2 by Wall Catalysis. Note by Robert R. Reeves, Gene Mannella and Paul Harteck, J. Chem. Phys., 32, 946-947, March 1960. 40 358. Use of Constant-Boiling Systems in Calibration of Mass Spectrometers and other Molecular Beam Instruments. Note by Alan W. Searcy, Wendell S. Williams, and Paul O. Schissel, J. Chem. Phys., 32, 957-958, March 1960. 4O 359. Thermal Conductivity of Condensed Films: Methane. A new method of determining the thermal conductivity of condensed films at low temperature has been developed. It is based on determining the surface temperature of a film of known area and thickness by measuring its equilibrium vapor pressure. The thermal conductivity (K) of the film is calculated by measuring the increase in surface temperature as the film thickness is increased when a known heat flux is flowing across the film. For methane at 85°K, K = 3.5 × 10 -3 w/cm°K. (Author) John T. Clarke and Ralph Gorden, Jr., J. Chem. Phys,, 32, 705-707, March 1960. 40 360. Interaction of Hydrogen with Tungsten. Measurements have been made under ultra-high vacuum conditions of the rates and isotherms for the adsorption of hydrogen on tungsten, the rate of desorption of hydrogen from tungsten,
357
Materials and Techniques used in Vacuum Technology 40.
4O
G a s e s and V a p o u r s 40
342. Calorimetric Heat of Adsorption--Nitrogen on Tungsten. P. Kislink, J. Chem. Phys., 31, 1605-1611, Dec. 1959. 40 343. Total Collision Cross Sections for the Interaction of Atomic Beams of Alkali Metals with Gases. Erhard W. Rothe and Richard B. Bernstein, J. Chem. Phys., 31, 1619-1627, Dee. 1959. 40 Containing
344. Studies of the Evaporation of Condensates Nitrogen Atoms. The products of an electrodeless discharge in nitrogen or mixtures of nitrogen in neon or argon were condensed at 4.2°K. The products evolved from this condensate when it was allowed to warm up slowly were continuously analyzed by means of a mass spectrometer having a lower detection limit of 2 × 10 -s mm of nitrogen atoms. Experimental evidence is presented for the presence of nitrogen atoms in the warm-up products. It was estimated that less than 10 -3 per cent of the nitrogen atoms originally condensed could be recovered. (Author) John T. Herron and Vernon H. Dibeler, J. Chem. Phys., 31, 1662-1665, Dec. 1959. 40 345. On Chemical Reactions in Free Molecule Flow. This paper deals with heterogeneous chemical reactions within systems in which the relevant geometric dimensions are small compared with the mean free path of gas molecules. A typical example can be found in a surface reaction occurring at moderate pressures inside the pore of a catalyst with a radius of several angstroms. Specific problems of this type have in the past been formulated, subject to the well-known limitations of ordinary diffusion theory, in terms of differential equations for the species concentrations. This in turn supposes that the reaction pattern is dependent on local conditions. A more general and exact formulation given in the following shows that the concentration of a molecular species at a point is determined by the concentration distributions of all species stemming from the entire system. Thus one is led to a formulation in terms of integral equations. In an application of the theory the validity of the conventional differential equation approach is investigated and is found to yield satisfactory results only under certain limiting conditions. (Author) Paul L. Chambre, J. Chem. Phys., 32, 24-27, Jan. 1960. 40 346. Negative Ion Formation in NO2 by Electron Attachment. R. E. Fox, J. Chem. Phys., 32, 285-287, Jan. 1960. 40 347. Pressure Induced Shifts of HCI Lines Due to Foreign Gases. Note by D. H. Rank, W. B. Birtlay, D. P. Eastman, and T. A. Wiggins, J. Chem. Phys., 32, 296-297, Jan. 1960. 4O 348. Pressure Induced Shifts of HCI Lines Due to Foreign Gases. Note by M. A. Hirshfeld, J. H. Jaffe, and S. Kimel, J. Chem. Phys., 32, 297-298, Jan. 1960. 40 349. Pressure Shifting of Spectrum Lines : Some Empirical Generalizations. Note by D. H. Rank, W. B. Birtley, D. P. Eastman, and T. A. Wiggins, J. Chem. Phys., 32, 298-299, Jan. 1960,
350. Threshold Ionization of HCI by Electron Impact. R. E. Fox, J. Chem. Phys., 32, 385-386, Feb. 1960. 4O 351. Thermal Conductivity of Binary Mixtures of Diatomic and Monatomic Gases. B. N. Srivastava and A. K. Barua, J. Chem. Phys., 32, 427-435, Feb. 1960. 40 352. Molecular Diffusion Studies in Gases at High Temperature. IV, Results and Interpretations of the COz-O2, CH-O.2, H ~ O , , CO-O~ and H 2 0 - O 2 Systems. R. E. Walker and A. A. Westenberg, J. Chem. Phys., 32, 436-442, Feb. 1960. 40 353. Infrared Emission Spectra of Gaseous B203 and B~O2. David White, David E. Mann, Patrick N. Walsh, and Armin Sommer, J. Chem. Phys., 32, 481-487, Feb. 1960. 40 354. Infrared Emission Spectrum of Gaseous HBO2. David White, David E. Mann, Patrick N. Walsh, and Armin Sommer, J. Chem. Phys., 32, 488-492, Feb. 1960. 40 355. Excitation of the Auroral Green Line in Nitrogen Afterglows. R. A. Young and K. C. Clark, J. Chent. Phys., 32, 607-611, Feb. 1960.
356. Vibrational Distribution in Late Nitrogen Afterglows. R. A. Young and K. C. Clark, J. Clwm. Phys., 32, 604-604, Feb. 1960. 40 357. Formation of Excited N O and N2 by Wall Catalysis. Note by Robert R. Reeves, Gene Mannella and Paul Harteck, J. Chem. Phys., 32, 946-947, March 1960. 40 358. Use of Constant-Boiling Systems in Calibration of Mass Spectrometers and other Molecular Beam Instruments. Note by Alan W. Searcy, Wendell S. Williams, and Paul O. Schissel, J. Chem. Phys., 32, 957-958, March 1960. 4O 359. Thermal Conductivity of Condensed Films: Methane. A new method of determining the thermal conductivity of condensed films at low temperature has been developed. It is based on determining the surface temperature of a film of known area and thickness by measuring its equilibrium vapor pressure. The thermal conductivity (K) of the film is calculated by measuring the increase in surface temperature as the film thickness is increased when a known heat flux is flowing across the film. For methane at 85°K, K = 3.5 × 10 -3 w/cm°K. (Author) John T. Clarke and Ralph Gorden, Jr., J. Chem. Phys,, 32, 705-707, March 1960. 40 360. Interaction of Hydrogen with Tungsten. Measurements have been made under ultra-high vacuum conditions of the rates and isotherms for the adsorption of hydrogen on tungsten, the rate of desorption of hydrogen from tungsten,