Which Is NOT True of Mass Spectrometers

question 15

Multiple Choice

Which is NOT true of mass spectrometers?

• A)Double-focusing mass spectrometers couple an electric sector to a magnetic sector to increase the resolution to ~10⁵.
• B)Transmission quadrupole mass spectrometers select ions by applying a constant voltage and a radio-frequency oscillating voltage to the four parallel metal rods.
• C)Orbitrap mass spectrometers do not require magnetic or radio-frequency fields to measure m/z.
• D)Quadrupole mass spectrometers operate at constant resolving power.
• E)The time-of-flight mass spectrometer employs a reflectron to group ions with the same m/z,regardless of initial kinetic energy.

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