The Effect of Space Charge on the Focusing Properties of a 180° Mass Spectrometer

1949 ◽  
Vol 20 (10) ◽  
pp. 745-745 ◽  
Author(s):  
Charles F. Robinson
Keyword(s):  
Space Charge ◽  
Mass Spectrometer ◽  
Focusing Properties

Focusing Properties of Short Space-Charge Lenses

1991 ◽  
Vol 8 (7) ◽  
pp. 337-340
Author(s):  
Yu Qingchang ◽  
Qiu Hong ◽  
Shu Chuanyu ◽  
Jiang Fuyou
Keyword(s):  
Space Charge ◽  
Short Space ◽  
Focusing Properties

Massenspektrometrische Untersuchungen an der Plasma-Grenzschicht / Mass Spectrometry at the Plasma Sheath

1974 ◽  
Vol 29 (9) ◽  
pp. 1276-1283
Author(s):  
Klaus Henrich ◽  
Karl Gerhard Müller
Keyword(s):  
Space Charge ◽  
Mass Spectrometer ◽  
Optical System ◽  
Mean Free Path ◽  
Plasma Sheath ◽  
Ion Current ◽  
Experimental Proof ◽  
Probe Current ◽  
Charge Zone ◽  
Ion Species

Mass spectrometric measurements of positive ions emerging from Ar-plasmas at 0.1-0.6 Torr are described. The adaption of the mass spectrometer requires besides the extraction probe an ion optical system, which causes the focussing and bunching of the ion current on the entrance of the time-of-flight mass spectrometer. Systematic measurements of the velocity distributions of the different ion species reveal:1. The Bohm-criterion is confirmed. In front of the wall the ions are heated in the quasineutral zone and are accelerated in the space charge zone, which here is in the order of magnitude of the ion mean free path.2. Heating and accelerating increase with growing ion current to the extraction probe.3. A further increase of the probe current causes collisions in the space charge zone which gives rise to a drop of the transmission of the optical system.4. The measurement of the current of one ion species as a function of the probe current is a simple experimental proof for collisions of the ions in the space charge zone.

A New Mass Spectrometer with Improved Focusing Properties

1938 ◽  
Vol 53 (7) ◽  
pp. 521-529 ◽  
Author(s):  
Walker Bleakney ◽  
John A. Hipple
Keyword(s):  
Mass Spectrometer ◽  
Focusing Properties
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