A simple mass spectrometer may include an electron ionization (EI) source and ma

Question

A simple mass spectrometer may include an electron ionization (EI) source and magnetic sector mass analyzer. In this type of instrument, singly charged ions are produced and accelerated through the slit to the analyzer by applying high potentials to accelerator plates. If an ion with mass 332 amu and charge z = 1 is accelerated by a potential of 1500 V, what is its kinetic energy (in J)?

Note: The following information may be useful for solving the two parts of this problem.

1 amu = 1.66 x 10-27 kg
Electronic charge, e = 1.602 x 10-19 C
1 J = 1 kg m2/s2
1 V = 1 J/C

What is the velocity of the ion?

Explanation / Answer

we have formula zeV = 1/2mv^2

1 x 1.602 x 10^-19 x 1500 = 1/2 x 332 x 1.66x10^-27 x v^2

v = 29530 m/s

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