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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.
29 sie 2023 · Why do you think it is called a “time-of-flight” mass analyzer? Consider a +1 ion with m/z = 115 which enters the time-of-flight source region (between the two plates). 1 elementary charge = 1.6 × 10-19 C \(\mathrm{1\: V = 1\:\: \large{ {}^J/_C} }\) A. KE = zV = (+1)(1.6 × 10-19 C)(2000 V) = 3.2 × 10-16 C . V = 3.2 × 10-16 J
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.
Time of flight (ToF) is the measurement of the time taken by an object, particle or wave (be it acoustic, electromagnetic, etc.) to travel a distance through a medium. This information can then be used to measure velocity or path length, or as a way to learn about the particle or medium's properties (such as composition or flow rate).
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.
tor. 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 which is solved for m looks like: m = 2E ...
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.
