Englishfor English speakers
laser
Noun
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A laser is a device that emits light through a process of optical amplification based on the stimulated emission of electromagnetic radiation.
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The term laser originated as an acronym for "light amplification by stimulated emission of radiation".
fluorescence
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noun
light emitted during absorption of radiation of some other (invisible) wavelength
spectrometer
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noun
(= mass spectrometer)
spectroscope for obtaining a mass spectrum by deflecting ions into a thin slit and measuring the ion current with an electrometer