Calibration of a time-of-flight machine for molecular beam studies

Journal Article · Tue Jan 01 04:00:00 EST 1974 · J. Phys., E (London), v. 7, no. 1, pp. 31-36

DOI:https://doi.org/10.1088/0022-3735/7/1/009· OSTI ID:4339906

Beijerinck, H C.W.; Moonen, R G.J.M.; Verster, N F

A time-of-flight machine for the velocity analysis of molecular beams is described together with an experimental investigation of systematic errors. A velocity selecting chopper is used to measure all delay times, including the delay in the beam detector due to the extraction time from the ionizer and the flight time of the ions in the quadrupole mass filter. With this ionizer no memory effects occur at emission currents smaller than 1 mA. Memory effects in the detector chamber due to the direct reflection of beam particles are eliminated by collimating the beam before the entrance and by trapping the beam in a separate volume afterwards, while obstacles inside the detector chamber are carefully avoided. The absolute calibration of the detector gives an efficiency of 1.6 x 10/sup -10/ counts/molecule for an O/sub 2/ beam of 1000 m s/sup -1/. Calibrations a week apart reproduce to within 6%. (auth)

• Research Organization: Technische Hogeschool, Eindhoven, Netherlands
• NSA Number: NSA-29-015795
• OSTI ID: 4339906
• Journal Information: J. Phys., E (London), v. 7, no. 1, pp. 31-36, Journal Name: J. Phys., E (London), v. 7, no. 1, pp. 31-36; ISSN JPEJB
• Country of Publication: United Kingdom
• Language: English

Related Subjects

*MOLECULAR BEAMS-- TIME-OF-FLIGHT SPECTROMETERS
*TIME-OF-FLIGHT SPECTROMETERS-- MOLECULAR BEAMS
CALIBRATION
COLLIMATORS
DISTRIBUTION
ERRORS
N46400* --Instrumentation--Miscellaneous Instruments
N60100 --Physics (Atomic & Molecular)--Atomic
Electron
Ion & Molecular Beams & Reactions
VELOCITY