time-of-flight spectrometer

Time-of-flight spectrometer

Any of a general class of instruments in which the speed of a particle is determined directly by measuring the time that it takes to travel a measured distance. By knowing the particle's mass, its energy can be calculated. If the particles are uncharged (for example, neutrons), difficulties arise because standard methods of measurement (such as deflection in electric and magnetic fields) are not possible. The time-of-flight method is a powerful alternative, suitable for both uncharged and charged particles.

The time intervals are best measured by counting the number of oscillations of a stable oscillator that occur between the instants that the particle begins and ends its journey. Oscillators operating at 100 MHz are in common use. See Mass spectroscope, Neutron spectrometry, Time-interval measurement

McGraw-Hill Concise Encyclopedia of Physics. © 2002 by The McGraw-Hill Companies, Inc.

time-of-flight spectrometer

[¦tīm əv ¦flīt spek′träm·əd·ər]
Any instrument in which the speed of a particle is determined directly by measuring the time it takes to travel a measured distance.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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Data reduction software modules in DAVE Facility Instruments NIST Center for Neutron Research Disk Chopper Spectrometer (DCS) (NCNR) Filter Analyzer Neutron Spectrometer (FANS) High Flux Backscattering Spectrometer (HFBS) Neutron Spin Echo Spectrometer (NSE) 4 Triple-Axis Spectrometers (TAS) Swiss Spallation Neutron Source FOCUS Time-of-Flight Spectrometer (SINQ) at the Paul Scherrer (24) Institut (PSI) MARS Backscattering Spectrometer (23) ISIS Pulsed Neutron Source at OSIRIS McStas Simulated Data Rutherford Appleton Laboratory Reduction (25), (26) Institut Laue-Langevin (ILL) Disk Chopper Time-of-Flight Spectrometer (IN5) C.
Students performed a variety of hands-on experiments using five of NCNR's state-of-the-art neutron scattering instruments: the disk-chopper time-of-flight spectrometer, the filter-analyzer spectrometer, the high-flux backscattering spectrometer, the neutron spin-echo spectrometer, and the spin-polarized inelastic neutron scattering spectrometer.
The first experiment, a study of the molecular dynamics of alpha-lactalbumin, has recently been performed on the disk chopper time-of-flight spectrometer (DCS) at the NIST Center for Neutron Research (NCNR).

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