Anorexia is a very common manifestation of disease. Cats that are eating ravenously present less of a diagnostic dilemma, as there is a shorter list of illnesses that result in increased appetite (diabetes, hyperthyroidism, pancreatic insufficiency and a few others).
The fragments that survive the journey through the analyzer shoot into the electron multiplier-the detector of the GCMS. The electron multiplier detects every ion of the selected mass that passes through the quadrupole analyzer. Electron multipliers use a process known as secondary electron emission. When the ions hit a surface, it causes the electrons in the outermost area of the atom to be released, which are known as secondary electrons.
For an electron microscope with 40,000 volts accelerating voltage, the wavelength of the electron would be 0.006 nm ((1.5/40,000)). Note that UV light increases the resolution by a factor of 2 over visible light, while the electron microscope has the potential to increase it by a factor of 10 to 10 over visible light. Maximum resolution is not attainable, however, unless the lenses are corrected for problems of lens design.