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

time-of-flight spectrometer

[¦tīm əv ¦flīt spek′träm·əd·ər]
(engineering)
Any instrument in which the speed of a particle is determined directly by measuring the time it takes to travel a measured distance.
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References in periodicals archive ?
"The high resolution and high flux of the neutron time-of-flight spectrometer at the Technical University of Munich FRM II neutron source was necessary to see the details of the atomic movements, Dr.
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.
Contract award: provision for rent with option to buy a hplc system coupled to a quadrupole time-of-flight spectrometer (all lc / qtof)
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.
Helmholtz Zentrum Berlin (HZB) is in the process to rebuild a time-of-flight spectrometer NEAT on Flight Path NL-1b at the BER-II.
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).