Spectrometer is a technique used to measured that how much a chemical substance absorbs light by measuring its intensity of light as a beam of light passes through solution.
IR spectrometer uses light over the infrared range from 700-15000 nm of electromagnetic radiation spectrum. If the concentration of greenhouse gases increases then more infrared radiation will be absorbed and emits back towards earth surface.
When infrared energy is absorbed by a matter the infrared causes the molecules or bonds to bend and vibrate. The matter gains kinetic energy which causes an increases in temperature. The absorption if radiation energy on matter causes an increases in temperature.
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