APPLCIATION OF THORIA-IRIDIUM AS THE SOURCE OF IONIZING ELECTRONS IN MASS SPECTROMETRY
In mass spectrometric studies of the photolysis of chlorine and formic acid to produce hydrogen chloride and carbon dioxide, a source pressure of 10/sup -5/ mm Hg is required; consequently, the principal instrumental difficulty encountered is burnout of the tungsten filament used to produce ionizing electrons. Due to the reaction of chlorine the filament must be replaced after each eight hours of service. The use of thoria-iridium as a filament in a mass spectrometer is discussed. This filament has a lower operating temperature, is chemically resistant to corrosive gases, has constant emission characteristics, and has a long life. (A.C.)
- Research Organization:
- Oak Ridge National Lab., Tenn.
- Sponsoring Organization:
- USDOE
- NSA Number:
- NSA-12-007937
- OSTI ID:
- 4351841
- Journal Information:
- Rev. Sci. Instr., Journal Name: Rev. Sci. Instr. Vol. Vol: 29
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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