MDCAT Chemistry MCQ #720

In the ionization chamber of a mass spectrometer, what mechanism is utilized to convert vaporized atoms into positive ions before acceleration?

MDCAT Chemistry MCQ #720

  1. Question 1

    Q1. In the ionization chamber of a mass spectrometer, what mechanism is utilized to convert vaporized atoms into positive ions before acceleration?

    • A) Thermal excitation of atoms
    • B) Proton bombardment
    • C) Electron bombardment
    • D) Magnetic field induction

    Answer: Electron bombardment

    Explanation: High-energy electrons knock out valence electrons from vaporized atoms to form positive ions; thermal ionization is used for different applications.