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A New Mass Spectrometer

Smythe, W. R. and Mattauch, J. (1932) A New Mass Spectrometer. Physical Review, 40 (3). pp. 429-433. ISSN 0031-899X. doi:10.1103/PhysRev.40.429.

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A new type of mass spectrometer has been constructed in which no magnetic fields are used. By applying an alternating electric field at right angles to the beam of positive particles all but certain velocities are removed from the beam. Because of the fact that a symmetry not contemplated in the theory previously published was introduced in the construction for mechanical reasons, the apparatus transmits some other velocities besides those desired. This produces extra peaks and complicates the mass spectrum. Because of this and the fact that the apparatus is badly contaminated with mercury from the diffusion pumps in spite of the continued use of liquid air, we have designed a new apparatus in which, it is expected, both effects will be eliminated. Comparison of the peak at 32 with that at 34 gives a maximum ratio of the intensity of O_(16)O_(16) to O_(16)O_(18)+Hg^(6+)_204 of 300. This is presumably the ratio with the smallest contamination of mercury and means that the ratio of O_(16) to O_(18) is greater than 600.

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Additional Information:© 1932 The American Physical Society. Received 22 March 1932. We are in debt to many people for advice and assistance in constructing this apparatus. I n particular we wish to thank Dr. John Pearson for his assistance with the crystal oscillator and Messrs. Pearson, Breslar, and Merkel of the instrument shop for their helpful suggestions and skillful workmanship.
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:47955
Deposited By: George Porter
Deposited On:05 Aug 2014 15:48
Last Modified:18 Jan 2023 20:19

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