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Molecular Spectra

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In addition to spectra associated with atoms and ions, molecules can interact with electromagnetic radiation and give rise to characteristic spectra. Because of basic atomic and molecular structure, the spectra associated with molecules typically involve infrared wavelengths. In addition, because molecules are usually fragile, molecular spectra are important mostly in objects that are relatively cool such as planetary atmospheres, the surfaces of very cool stars, and various interstellar regions.

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