the use of spectroscopes to analyze spectra
"The lab technician used mass spectrometry to identify unknown substances by analyzing their unique spectral signatures."
The measurement of the wavelength of electromagnetic radiation, especially any of several techniques used to analyze the structure of molecules; the measurement of spectra of things other than radiation, such as the masses of molecules and their breakdown products
"The lab technician used mass spectrometry to identify the unknown compound by analyzing its molecular fragments."