Ad ___, Ad-___ (improvises)

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Possible Answers: LIBS.

Random information on the term “LIBS”:

Spectroscopy /spɛktrɒskəpi/ is the study of the interaction between matter and radiated energy.[1][2] Historically, spectroscopy originated through the study of visible light dispersed according to its wavelength, e.g., by a prism. Later the concept was expanded greatly to comprise any interaction with radiative energy as a function of its wavelength or frequency. Spectroscopic data is often represented by a spectrum, a plot of the response of interest as a function of wavelength or frequency.
Taken from Wikipedia