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Spectroscopy

Spectroscopy is the scientific study of how matter interacts with electromagnetic radiation across wavelengths from gamma rays and X-rays through visible light to infrared, microwave, and radio frequencies, revealing composition, structure, and energy states of substances with remarkable precision.

Type: Concept Domain: Chemistry Physics Biology Engineering

Overview

By analyzing the characteristic ways atoms and molecules absorb, emit, or scatter radiation, spectroscopy produces spectral fingerprints unique to each element and compound; it provided the first empirical evidence for quantization of atomic energy levels, directly informing the development of quantum mechanics in the early 20th century.

Why it matters

Spectroscopy has been an essential analytical advance enabling chemistry, physics, biology, and astronomy to identify substances at trace concentrations — and in astronomy it remains the primary method for determining the composition, temperature, velocity, and distance of stars and galaxies billions of light-years away.

What it builds on

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