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29 sie 2023 · Examine the diagram of a reflectron TOF mass analyzer. A. Lowest mass ion arrives first and highest mass ion arrives last. (red, blue, black, then yellow) A. To measure flight times a set of ions must enter the mass analyzer and be accelerated all at the same time.
Time-of-Flight. The time-of-flight (TOF) mass analyzer separates ions in time as they travel down a flight tube (Figure \(\PageIndex{1}\)). This is a very simple mass spectrometer that uses fixed voltages and does not require a magnetic field.
The intention of this tutorial is to introduce into the basic concepts of time-of-flight mass spectrometry, beginning with the most simple single-stage ion source with linear field-free drift region and continuing with two-stage ion sources combined with field-free drift regions and ion reflectors—the so-called reflectrons.
Time-of-flight mass spectrometry ( TOFMS) is a method of mass spectrometry in which an ion 's mass-to-charge ratio is determined by a time of flight measurement. Ions are accelerated by an electric field of known strength. [1] . This acceleration results in an ion having the same kinetic energy as any other ion that has the same charge.
The time of flight is proportional to the square root of the mass of the ions, showing that the lighter the ion the faster it will pass through and the quicker it will hit the detector. The heavier the ion, the slower it will travel and the longer it will take to hit the detector.
The flight time (t) is determined by the energy (E) to which an ion is acceler-ated, the distance (d) it has to travel, and its mass (strictly speaking its mass-to-charge ratio). There are two well know formulae that apply to time-of-flight analysis. One is the formula for kinetic energy: E = 1/2mv2.
29 sie 2023 · Time of flight mass analyzer principle. The principle of a Time-of-flight mass analyzer relies on the simple idea that ions with varying mass-to-charge ratios and the same kinetic energy move at different speeds in an electric field, which will determine the composition or structure of substances.
