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 424 amu and charge z = 1 is accelerated by a potential of 8500 V, what is its kinetic energy (in J)? 1 amu = 1.66 times 10^-27 kg Electronic charge, e = 1.602 times 10^-19 C 1 J = 1 kg m^2/s^2 1 V = 1 J/C What is the velocity of the ion?

Explanation / Answer

a)

K.E=P.E

=q*V

=1.6*10^-19*8500

=1.36*10^-15 J

b)

K.E=1/2*m*v^2

1.36*10^-15 = 1/2*(424*1.66*10^-27)*v^2

==> v=6.22*10^4 m/sec

velocity, v=6.22*10^4 m/sec

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