Name: A New Method of Positive Ray Analysis
Author: Arthur Jeffrey Dempster

Quotes from A New Method of Positive Ray Analysis (Arthur Jeffrey Dempster)

Arthur Jeffrey Dempster, A New Method of Positive Ray Analysis (1918)

“ Positive Ions From Aluminium Phosphate The positive ions obtained from heated aluminium phosphate have been used by many experimenters. These ions were analyzed and found to consist usually of sodium and potassium, although on one occasion after standing overnight, the emission was at first entirely hydrogen atoms. This wore off in a few minutes and the emission became sodium and potassium, At first the potassium was very much stronger than the sodium, but after heating some time it died off and became much weaker. ”

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Arthur Jeffrey Dempster, A New Method of Positive Ray Analysis (1918)

“ Resolving Power If the rays were uniformly distributed over the entrance slit and the refocusing perfect, the curve obtained for the charge as the potential or field strength is varied to bring various parts of the bundle on the exit slit, would be of the form given in Fig. 3. Let S be the width of the slits and A'&&2 represent the abscissa where the curve is half its maximum value. 8 = h~h2 if the abscissz. represent distances. ”

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Arthur Jeffrey Dempster, A New Method of Positive Ray Analysis (1918)

“ Mercury vapor must be kept away from the apparatus at all times by the use of liquid air, for in a very short time sufficient will diffuse over and condense on the brass to prevent a high vacuum being obtained. ”

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Source: Wikisource

Arthur Jeffrey Dempster, A New Method of Positive Ray Analysis (1918)

“ Aluminium phosphate on a piece of platinum foil was first bombarded. The intensity of the rays increased very rapidly with a slight increase in the amount or energy of the bombarding electrons, indicating that the salt needs to be heated to a certain degree before the ions are separated. Although the aluminium phosphate was chemically pure, the rays ob- tained under the bombardment of I28 volt electrons were very complex ”

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Source: Wikisource

Arthur Jeffrey Dempster, A New Method of Positive Ray Analysis (1918)

“ The potassium is much stronger than the sodium at 6rst but at higher temperatures the sodium becomes the stronger.
No great difficulty is expected in extending the investigation to all the substances found by Richardson and others to emit positive or nega- tive ions on being heated. With weak sources it will be necessary to widen the slits and be content with less resolution.
Positive Ions From Electron Bombardment It was thought that the bombardment of salts by electrons might break up the chemical compounds and give rise to many positive ions. ”

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Source: Wikisource

Arthur Jeffrey Dempster, A New Method of Positive Ray Analysis (1918)

“ It was found that the method could also be developed to give a very great resolving power among the elements. The method is essentially identical with that used by Classen in his determination of e/nz for electrons. The charged particles from some source fall through a deGnite potential difference. A narrow bundle is separated out by a slit and is bent into a semicircle by a strong magnetic Geld ”

Arthur Jeffrey Dempster

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Quotes from A New Method of Positive Ray Analysis (Arthur Jeffrey Dempster)

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Arthur Jeffrey Dempster

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Quotes from A New Method of Positive Ray Analysis (Arthur Jeffrey Dempster)

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