Question

Measuring the approximate mass of an ion without using a standard can be accomplished via the following variant of the peak-matching technique describe in the Problem 5. The peakmatching technique is used to alternately cause the P⁺ ion and the (P+1)⁺ ions to reach the detector. It is assumed that the difference in mass between P⁺ and (P+1)⁺ is due to a single ¹³C replacing a ¹²C atom.

a) If the accelerating voltage for (P+1)⁺ is labeled V2 and that for P⁺ is V1, derive a relationship that relates the ratio V2/V1 to the mass of P⁺ .

b) If V2/V1 =0.976542, calculate the mass of the P⁺ ion.

Answer 1