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Fig. 6

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Difference spectra obtained before and after 5 min of IR-FEL irradiation on ice mixtures of CO and CH3OH at 20 K. Upper panel: mixture ratio of CO:CH3OH = 1:0.3. Lower panel: mixture ratio of CO:CH3OH = 1:3.0. The control TPD difference spectra between 25 K and 20 K are also shown in cyan. The irradiation spectra are offset for clarity.

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