Matches in SemOpenAlex for { <https://semopenalex.org/work/W1976988894> ?p ?o ?g. }
Showing items 1 to 76 of
76
with 100 items per page.
- W1976988894 abstract "In a previous communication (Mann 1934) it was recorded that the accommodation coefficient for helium atoms relative to a platinum surface at 100°C., which had been cleaned by heating for some hours at 1000°C., was considerably lower than the values relative to a normal contaminated surface. The accommodation coefficient rose with time, however, on lowering the temperature of the platinum to 100°C., this rise indicating some process of contamination. If, however, the platinum surface were heated for several hours at 1000°C. in oxygen, the rate of increase of the accommodation coefficient of helium, after flashing, was now greatly decreased; the platinum surface had become much less susceptible to contamination. This difference is shown in fig. 1, where the increase in the accommodation coefficient at 100°C. is plotted against time after flashing the platinum filament both before and after the oxygen treatment. The increase in accommodation coefficient after the oxygen treatment is inappreciable. It was not possible to determine whether this effect was due to the formation of a protective film of oxide or to a levelling of the platinum surface by an etching away of the prominences by combination with oxygen and evaporation of the platinum oxide formed. That a certain amount of such evaporation actually occurred was supported by the observed loss in the mass of the platinum filament during the oxygen treatment. It seemed, however, that an investigation of the surface conditions might well be carried out by the method of electron diffraction, and in this communication experiments will be described in which both the accommodation coefficient of helium relative to a platinum surface and also the nature of the surface have been determined. Apparatus The choice of apparatus suitable for these experiments has been governed by the necessity of carrying out electron-diffraction investigations and energy-loss determinations upon one and the same specimen with as short a time interval as possible between the two. An electron camera of the Thomson-Fraser pattern (Thomson and Fraser 1930) was available and was used, in a horizontal position, after slight alterations had been made to the specimen holder and to the plate chamber. In order to exclude the possibility of contamination of the platinum surface in the process of raising the pressure in the apparatus to atmospheric for the purpose of changing the photographic plates, the precaution was taken of using a plate-changing device which eliminated the necessity of admitting air into the main apparatus." @default.
- W1976988894 created "2016-06-24" @default.
- W1976988894 creator A5055719162 @default.
- W1976988894 date "1937-07-15" @default.
- W1976988894 modified "2023-09-23" @default.
- W1976988894 title "The exchange of energy between a platinum surface and helium atoms and its dependence upon the structure of the surface" @default.
- W1976988894 cites W2022968228 @default.
- W1976988894 doi "https://doi.org/10.1098/rspa.1937.0143" @default.
- W1976988894 hasPublicationYear "1937" @default.
- W1976988894 type Work @default.
- W1976988894 sameAs 1976988894 @default.
- W1976988894 citedByCount "0" @default.
- W1976988894 crossrefType "journal-article" @default.
- W1976988894 hasAuthorship W1976988894A5055719162 @default.
- W1976988894 hasBestOaLocation W19769888941 @default.
- W1976988894 hasConcept C113196181 @default.
- W1976988894 hasConcept C121332964 @default.
- W1976988894 hasConcept C147789679 @default.
- W1976988894 hasConcept C150394285 @default.
- W1976988894 hasConcept C161790260 @default.
- W1976988894 hasConcept C162711632 @default.
- W1976988894 hasConcept C178790620 @default.
- W1976988894 hasConcept C185592680 @default.
- W1976988894 hasConcept C192562407 @default.
- W1976988894 hasConcept C2780148907 @default.
- W1976988894 hasConcept C43617362 @default.
- W1976988894 hasConcept C518104683 @default.
- W1976988894 hasConcept C540031477 @default.
- W1976988894 hasConcept C55493867 @default.
- W1976988894 hasConcept C61441594 @default.
- W1976988894 hasConcept C97355855 @default.
- W1976988894 hasConcept C9950777 @default.
- W1976988894 hasConceptScore W1976988894C113196181 @default.
- W1976988894 hasConceptScore W1976988894C121332964 @default.
- W1976988894 hasConceptScore W1976988894C147789679 @default.
- W1976988894 hasConceptScore W1976988894C150394285 @default.
- W1976988894 hasConceptScore W1976988894C161790260 @default.
- W1976988894 hasConceptScore W1976988894C162711632 @default.
- W1976988894 hasConceptScore W1976988894C178790620 @default.
- W1976988894 hasConceptScore W1976988894C185592680 @default.
- W1976988894 hasConceptScore W1976988894C192562407 @default.
- W1976988894 hasConceptScore W1976988894C2780148907 @default.
- W1976988894 hasConceptScore W1976988894C43617362 @default.
- W1976988894 hasConceptScore W1976988894C518104683 @default.
- W1976988894 hasConceptScore W1976988894C540031477 @default.
- W1976988894 hasConceptScore W1976988894C55493867 @default.
- W1976988894 hasConceptScore W1976988894C61441594 @default.
- W1976988894 hasConceptScore W1976988894C97355855 @default.
- W1976988894 hasConceptScore W1976988894C9950777 @default.
- W1976988894 hasLocation W19769888941 @default.
- W1976988894 hasOpenAccess W1976988894 @default.
- W1976988894 hasPrimaryLocation W19769888941 @default.
- W1976988894 hasRelatedWork W128845540 @default.
- W1976988894 hasRelatedWork W1972488026 @default.
- W1976988894 hasRelatedWork W1979487842 @default.
- W1976988894 hasRelatedWork W1985755555 @default.
- W1976988894 hasRelatedWork W2010558086 @default.
- W1976988894 hasRelatedWork W2015815728 @default.
- W1976988894 hasRelatedWork W2021812436 @default.
- W1976988894 hasRelatedWork W2024855321 @default.
- W1976988894 hasRelatedWork W2030908696 @default.
- W1976988894 hasRelatedWork W2039830135 @default.
- W1976988894 hasRelatedWork W2041190308 @default.
- W1976988894 hasRelatedWork W2063220546 @default.
- W1976988894 hasRelatedWork W2070020459 @default.
- W1976988894 hasRelatedWork W2090948385 @default.
- W1976988894 hasRelatedWork W2107640839 @default.
- W1976988894 hasRelatedWork W2199090800 @default.
- W1976988894 hasRelatedWork W2331264937 @default.
- W1976988894 hasRelatedWork W2586304701 @default.
- W1976988894 hasRelatedWork W2184319830 @default.
- W1976988894 hasRelatedWork W2858299960 @default.
- W1976988894 isParatext "false" @default.
- W1976988894 isRetracted "false" @default.
- W1976988894 magId "1976988894" @default.
- W1976988894 workType "article" @default.