An a. c. operated mass spectrograph of the Mattauch type.
A mass spectrograph for chemical analysis of solid samples has been developed. The Mattauch arrangement of a 31° 50′ electric deflection followed by a 90° deflection in a magnetic field was used in order to obtain a large mass range in focus on one plate. The accelerating and deflecting voltages, and the current for the electromagnet were obtained from stabilized rectifier circuits connected to the 60‐cycle a.c. supply. The electromagnet with 100 milliamperes gave a field of 18,800 gauss across a ⅛″ gap. During the introduction of the plate or insertion of new electrodes a gate valve was closed to isolate the spectrograph from the pumping system. In this way different samples could be examined rapidly. The ion source was energized by a compact Tesla transformer wound on Lucite cylinders. One exposure covered a mass range from any mass M to a mass 10M.
A Stabilized Ionization Gauge Circuit with Vacuum Tube Voltmeter
A complete control circuit for use with the usual triode ionization gauge tube is described. A modified Ridenour Lampson type circuit is employed to stabilize grid and plate voltage, as well as emission current. A simple vacuum tube voltmeter circuit permits the use of a relatively rugged 0–1 milliameter to read plate current. Special provision is made for outgassing, and for leak hunting.
Über die Anregung von Spektren zur Untersuchung von Hyperfeinstrukturen
ZusammenfassungEs wird eine Versuchsanordnung beschrieben, die es ermöglicht, auch das Leuchten der Metalldämpfe bei den Temperaturen der flüssigen Luft und des flüssigen Wasserstoffs zu beobachten. Der verminderte Dopplereffekt gestattet eine genauere Feststellung der Struktur der Spektrallinien, als es bei den gewöhnlichen spektroskopischen Lichtquellen der Fall ist.