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Fig. 4

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Changes to IR spectra observed during near-UV irradiation of C4H2 ice films. (a) Evolution of the differential absorbance (AtAt=0) of the v4 band of C4H2 as function of the time of irradiation at 355 nm at JPL. (b) Evolution of the differential absorbance of the v4 band of C4H2 as function of the time of irradiation at λ > 300 nm at PIIM. (c) Evolution of the differential absorbance of the v5 band of C4H2 as function of the time of irradiation at 355 nm at JPL. (d) Evolution of the differential absorbance of the v5 band of C4H2 as function of the time of irradiation at λ > 300 nm at PIIM.

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