Gaseous Element X is heated in a rigid cylinder in a mass spectrometer nozzle. a

Question

Gaseous Element X is heated in a rigid cylinder in a mass spectrometer nozzle. and released through a narrow Magnet Negative Plate Beam (A) Photographic Film Beam (B)-? 1 2 3 45 6 1 2 3 45 6 When gas X is released from a mass spectrometer, two different ions are formed (+1 and +2) and pass through a magnetic field. Three isotopes are detected,30x, 31X and 3x. When the photographic film is displayed, the results for the beams (1-6) are displayed in the rectangular box. (a) Which beam of ions (A or B) represents the X ion? Explain. (b) Which beams (1-6) represent the X-32 isotope? Explain.

Explanation / Answer

(a) Beam B represents X+2 ion. Since there are three isotopes X-30, X-31, and X-32. Donot confuse between X+2 and X+2 ions. First one is due to loss of two electrons whereas latter one is due to isotope mass effect ion, like M+ and M+1, M+2 ions.

(b) Beam-6 represents X-32 isotope. Isotope peaks always appear at higher m/z values compare to normal element ion. This means isotopes peaks appear at right-hand side of the normal M+ peak. Since there are three isotopes, implies X-30 is beam 4, X-31 is beam 5 and X-32 is beam 6.

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