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Mass calibration

Olivier Scholder edited this page Jan 8, 2019 · 4 revisions

For a particle of mass m and energy E we have

E=\frac{1}{2}mv^2;\Rightarrow;v=\sqrt{\frac{2E}{m}}

so if the detection path length is L

t=\frac{L}{v}=L\sqrt{\frac{m}{2E}}

if the energy E=q∙U for the charge q and the voltage U.

m=\frac{2qU}{L^2}t^2

For the case of ToF-SIMS, we define a variable sf as follow:

sf=\frac{L}{\sqrt{2qU}}

k0 is a time delay and the mass can be retrieved by:

m=\left(\frac{t-k0}{sf}\right)^2

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