"Spectroscopy is basically an experimental subject and is concerned with the absorption, emission or scattering of electromagnetic radiation by atoms or molecules. … electromagnetic radiation covers a wide wavelength range, from radio waves to γ-rays, and the atoms or molecules may be in the gas, liquid or solid phase or, of great importance in surface chemistry, adsorbed on a solid surface. … Experimental methods of spectroscopy began in the more accessible visible region of the electromagnetic spectrum where the eye could be used as the detector."
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Original Language: English
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J. Michael Hollas, in Modern Spectroscopy (2004), Ch. 1 : Some Important Results in Quantum Mechanics
https://en.wikiquote.org/wiki/Spectroscopy
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Spectroscopy
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