GENERAL ELECTRIC 22PTI03 ZS-8008 Mass Spectrometer Tube
Tube pour spectromètre de masse
Massenspektrometer-Röhre

This tube is marked as follows :

GENERAL ELECTRIC

G22PTI03

ZS-8008 65-39 188-6

This tube has been manufactured in 1965 at the Schenectady (Power Tube Dept.) plant.

The “elbow” goes between the poles of a very large permanent magnet. The gas or vapor to be analyzed is introduced through the pipe. A hard vacuum is then pulled on the unit and a high voltage is used to ionize the molecules, which are accelerated to a particular speed (controlled by the voltage and the current applied to the plates), and sent around the bend in a strong magnetic field. The speed/mass of molecule and the magnetic field strength combine such that only molecules of a particular mass make it around the bend; the others crash into the walls. The ones that make it hit the multiplier give a current output — so the mass selection is swept through the desired range and current measured, and a quantitative display of molecular masses in the sample can be computed.

Thanks to Danial Stocks, Jim RabidWolf Hickinbotham, Nick Huwar and Ludwell Sibley who helped to identify this device.

 

39 x 24.5 cm • 15"3/8 x 9"5/8

There is a multiplier on one end.

Before entering the metallic elbow, the beam passes through two very narrow slots.

View taken through the exhaust pipe.

View taken through the base

 

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