Results 211 to 220 of about 55,018 (263)
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Vacuum, 1962
Abstract Methods for determining the activation energy, rate constant and order of reaction from “flash-filament” desorption experiments are examined. Two heating schedules are considered: (a) a linear variation of sample temperature with time (T = T0+st), and (b) a reciprocal temperature variation ( 1 T = 1 T 0 −αt) .
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Abstract Methods for determining the activation energy, rate constant and order of reaction from “flash-filament” desorption experiments are examined. Two heating schedules are considered: (a) a linear variation of sample temperature with time (T = T0+st), and (b) a reciprocal temperature variation ( 1 T = 1 T 0 −αt) .
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Thermal Desorption Spectroscopy
2018TDS is a method for the study of adsorption, desorption, and reaction of adsorbed atoms or molecules on surfaces by measuring the desorption rate of desorbing gas from surfaces as a function of sample temperature. The basic concept of this method is that adsorbates with a higher desorption barrier desorb at higher temperature.
Shohei Ogura, Katsuyuki Fukutani
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Phosphorus Sorption and Desorption in Soils Treated by Thermal Desorption
Water, Air, & Soil Pollution, 2020Thermal desorption (TD) is an effective way to remove hydrocarbons from soil. Soil exposure to temperatures between 100 and 400 °C to volatilize hydrocarbons can alter soil chemical properties that have potential to change phosphorus (P) dynamics. A series of laboratory soil sorption and desorption experiments were conducted on native and thermal ...
S. J. Croat +3 more
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The Journal of Physical Chemistry A, 2015
Cationic rhodium clusters, Rh(n)(+) (n = 4-8), were prepared in the gas phase by the laser ablation of a Rh rod. The Rh(n)(+) clusters were introduced into a reaction gas cell filled with nitric oxide (NO) diluted with He, where they were subjected to collisions with NO and He in a thermal equilibrium at 300 K.
Yuki, Tawaraya +3 more
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Cationic rhodium clusters, Rh(n)(+) (n = 4-8), were prepared in the gas phase by the laser ablation of a Rh rod. The Rh(n)(+) clusters were introduced into a reaction gas cell filled with nitric oxide (NO) diluted with He, where they were subjected to collisions with NO and He in a thermal equilibrium at 300 K.
Yuki, Tawaraya +3 more
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Direct and thermal desorption of 4He films
Physics Letters A, 1983We have studied desorption from a ^4He film due to a hot but low-intensity beam of phonons incident from a sapphire substrate. Time of flight spectra of the desorbed atoms revealed two distinct peaks which we attribute to direct desorption by substrate phonons and to thermalization with subsequent desorption.
Sinvani, M., Taborek, P., Goodstein, D.
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Vacuum, 1980
Abstract The detection and identification of condensable impurities in a high pressure helium stream as applicable to the Isabelle liquid helium refrigeration system has motivated a study of multilayer desorption of condensed layers from a metal substrate.
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Abstract The detection and identification of condensable impurities in a high pressure helium stream as applicable to the Isabelle liquid helium refrigeration system has motivated a study of multilayer desorption of condensed layers from a metal substrate.
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2015
The study of the surface behavior of high area solids can be carried out using extensions of the fundamental measurement methods developed for studies of low area single crystal surfaces. Among the most widely used methods in single crystal studies is temperature-programmed desorption (TPD), often called thermal desorption spectroscopy (TDS).
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The study of the surface behavior of high area solids can be carried out using extensions of the fundamental measurement methods developed for studies of low area single crystal surfaces. Among the most widely used methods in single crystal studies is temperature-programmed desorption (TPD), often called thermal desorption spectroscopy (TDS).
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Kinetic theory of thermal desorption
Physics Letters A, 1975Abstract Kramers' description of chemical reactions as a Brownian motion of the reacting species is applied to the thermal desorption processes. It turns out that the spatial variation of the friction constant of the underlying Fokker-Planck equation is of special importance for such processes.
W. Brenig, H. Müller, R. Sedlmeier
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Thermal desorption spectroscopy on silicon
Surface Science, 1990Abstract Traced back to the early work on Thermal Desorption Spectroscopy (TDS) a short introductory survey is given on the experimental method, basic relations and the further development of evaluation procedures. Ad- and desorption of hydrogen on silicon as a seemingly simple system is discussed chiefly in terms of TDS results. Though the main H 2
Ch. Kleint, K.-D. Brzóska
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Theoretical analysis of thermal desorption
Applied Physics, 1979The physical causes of multiple peaks obversed in thermal desorption spectra are investigated using chemical rate equations and a two binding site model. An exclusion term is introduced which adds the repulsive adatom-adatom hard sphere interactions into the rate equations. Finally, using a fundamental statistical mechanical approach it is demonstrated
S. B. Whitehouse, P. Jewsbury
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