Kaitlyn Lieschke added Measurement.tex  about 9 years ago

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\section{Measurement}  Trace gases absorb infrared radiation due to vibration-rotation transitions. Each species has a unique infrared spectral signature and the amount of infrared absorbed directly correlates to the amount of the species that is present \cite{Griffiths2007}. The atmospheric abundance of CO, HCN, CH$_{2}$O and CH$_{3}$OH can be measured using ground-based solar Fourier Transform infrared Spectrometers (FTS) \cite{Rinsland2001,Jones2007,Rinsland2009}. The spectra recorded by the FTS record the transmittance of wavelengths of light, from which the absorbance is inversely calculated \cite{Griffiths2007}. As the the sun is the source of infrared radiation, measurements can only be recorded during the day when there are no clouds.