SECONDARY REACTIONS IN THE ION CHAMBER OF A MASS SPECTROMETER

Journal Article · Thu Mar 01 04:00:00 EST 1962 · Journal of Chemical Physics (U.S.)

DOI:https://doi.org/10.1063/1.1732720· OSTI ID:4783314

Marmet, P; Morrison, J D

A study was made with a mass spectrometer of the ionization efficiencies of a number of gases, using an ion source incorporating an electron velocity selector. It is found that the shapes of the I.E. curves are affected by numerous instrumental factors. These were examined, and the data lead to the following conclusions. Ions may be formed on the walls of the iondzation source, at energies different from those corresponding to the ionfzed states of the free molecules. Charge transfer reactions may occur between these bound ions, and other neutral molecules on the walls. The surface ions may subsequently become detached, and are detected at the collector of the mass spectrometer. It is suggested that these ions formed by such processes may account for many of the spurious breaks often found in measured I.E. curves. The sharpness of the structure in the present curves indicates that the half-width of the electron energy spread is of the order oi 0.02 ev. (auth)

• Research Organization: Commonwealth Scientific and Industrial Research Organization, Melbourne
• Sponsoring Organization: USDOE
• NSA Number: NSA-16-015296
• OSTI ID: 4783314
• Journal Information: Journal of Chemical Physics (U.S.), Journal Name: Journal of Chemical Physics (U.S.) Vol. Vol: 36; ISSN JCPSA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

EFFICIENCY
ELECTRIC CHARGES
ELECTRON BEAMS
ELECTRONS
ENERGY
ENERGY LEVELS
GASES
INSTRUMENTS
INTERACTIONS
ION SOURCES
IONIZATION
MASS SPECTROMETERS
MOLECULES
MONOCHROMATORS
PHYSICS
SURFACES
VELOCITY
VESSELS