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Ion-to-photon detectors may also detect ions with a mass of up to around 20,000 Da, better than microchannel plates. However, the resolution of the mass spectrum from an IPD equipped spectrometer is slightly lower. The noise in the spectrum, which may come from unfocused, slow speed ions, is also slightly higher.
A microchannel plate within a Finnigan MAT 900 sector mass spectrometer position-and-time-resolved-ion-counting (PATRIC) scanning array detector. An external voltage divider is used to apply 100 volts to the acceleration optics (for electron detection), each MCP, the gap between the MCPs, the backside of the last MCP, and the collector .
Mass spectrometry (MS) is an analytical technique that is used to measure the mass-to-charge ratio of ions. The results are presented as a mass spectrum, a plot of intensity as a function of the mass-to-charge ratio. Mass spectrometry is used in many different fields and is applied to pure samples as well as complex mixtures.
The mass spectrometer is fitted with a special device, a sniffer probe, that allows it to sample air (and tracer gas when confronted with a leak) at atmospheric pressure and to bring it into the mass spectrometer. This mode of operation is frequently used to locate a leak that has been detected by other methods, in order to allow for parts repair.
By processing data in a manner similar to that used in Fourier-transform ion cyclotron resonance mass spectrometry (FTICR-MS), the trap can be used as a mass analyzer. Like in FTICR-MS, all the ions are detected simultaneously over some given period of time and resolution can be improved by increasing the strength of the field or by increasing ...
A Daly detector is a gas-phase ion detector that consists of a metal "doorknob", a scintillator (phosphor screen) and a photomultiplier. [1] It was named after its inventor Norman Richard Daly. Daly detectors are typically used in mass spectrometers .
Trifluoroacetic acid (TFA) as additive to the mobile phase is widely used for complex mixtures of biomedical samples, mostly peptides and proteins, using mostly UV based detectors. They are rarely used in mass spectrometry methods, due to residues it can leave in the detector and solvent delivery system, which interfere with the analysis and ...
Thermal ionization mass spectrometry (TIMS) is also known as surface ionization and is a highly sensitive isotope mass spectrometry characterization technique. The isotopic ratios of radionuclides are used to get an accurate measurement for the elemental analysis of a sample. [ 1 ]