Atomic Masses 12C 12.0000u d 14N 160 14.0031u 15.9949u Detector
The image below shows a mass spectrometer, an analytical instrument used to identify the various molecules in a sample by measuring their charge-to-mass ratio e/m. The sample is ionized, the positive ions are accelerated (starting from rest) through a potential difference ΔV, and they then enter a region of uniform magnetic field. The field bends the ions into circular trajectories, but after just half a circle they either strike the wall or pass through a small opening to a detector. As the accelerating voltage is slowly increased, different ions reach the detector and are measured. Typical design values are a magnetic field strength B = 0.627 T and a spacing between the entrance and exit holes d = 5.83 cm.
a)What accelerating potential difference ΔV is required to detect N2+?
b)What accelerating potential difference ΔV is required to detect O2+?
c)What accelerating potential difference ΔV is required to detect CO+?
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