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Quadrupole mass analyzer, Heng Aie Yin Melanie Tan Hui Ling Sia Wan Ern …

- - - - intact molecular ions or fragment ions formed by in-source fragmentation
- - - - ions enter the quadrupolar field with low velocity and reach detector
        
        rods will focus only large positively charged ions which has high mass filters
        
        oscillation of ions within the quadrupole MS occur according to the Mathieu Equation
        
        required for stable ion oscillation are determined by the mass and oscillation frequency
- - - - not for high resolution mass spectra
      - In a quadrupole, higher resolution = lower sensitivity
      - Mass accuracy partly depend on the precision with U and V ; U =applied DC voltage , V= applied zero-to-peak RF voltage
- - - - ion abundance in the specified range of the mass spectrum can be recorded