Final answer:
A mass spectrometer uses a vacuum pump to allow ionization of gas to take place, separating ions based on their mass-to-charge ratios in a vacuum for analytical purposes.
Step-by-step explanation:
The type of gas analyzer that uses a vacuum pump to allow ionization of gas to take place is the Flame ionization detector (FID). The FID operates by passing the gas sample through a flame, where ionization occurs. The resulting ions are then detected and measured.
The type of gas analyzer that uses a vacuum pump to allow ionization of gas to take place is a mass spectrometer. In mass spectrometry, samples are first ionized, then separated based on their mass-to-charge ratios through the use of electric and/or magnetic fields. This process is performed within a vacuum created by a pump, essential for the ionization and travel of the ions without interference from other gas molecules. Mass spectrometry is a versatile analytical technique that can be used in various fields such as forensics, medicine, and environmental science to identify and quantify different substances based on their unique mass spectra.