Spectroscopic Measurement

In absorption spectroscopy, the amount of light absorbed as a function of wavelength is measured.

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In emission spectroscopy, the stimulus is by a chemical reaction while in chemiluminescence spectroscopy, the analyte is excited by heat or electrical energy.

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In emission spectroscopy, measurement of the radiant power emitted as the analyte returns to the ground state can give information about its identity and concentration in a spectrum.

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The stimulus causes some of the analyte species to undergo a transition to a higher-energy or excited state.

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Absorption process occurs if the radiation's energy matches the difference in energy between two energy levels.

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