Final answer:
The analyzer that includes a Geissler tube, vacuum pump, and ion chamber is the mass spectrometer, which is used in fields like chemistry and medicine to identify substances.
Step-by-step explanation:
The analyzer that uses a Geissler tube, vacuum pump, and ion chamber is the mass spectrometer. In a mass spectrometer, samples are ionized, often by an electron beam, and the resulting ions are separated based on their mass-to-charge ratios. The detection of these ions allows for the analysis and identification of substances within a sample. A mass spectrometer is a versatile tool, utilized in various applications such as chemistry, forensics, and medicine. It enables the accurate determination of the mass of ions and the identification of unknown substances when used alongside techniques like gas chromatography.