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Why do we use the infrared (IR) part of the electromagnetic spectrum to determine chemical structure in IR spectroscopy versus other wavelengths such as the visible ones?

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Why do we use the infrared (IR) part of the electromagnetic spectrum to determine chemical structure in IR spectroscopy versus other wavelengths such as the visible ones?	4
In lithographic computer chip production why don't we skip wavelengths and use short wavelength x-rays?	1