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. 2017 Aug 4;8:186. doi: 10.1038/s41467-017-00321-0

Fig. 4.

Fig. 4

Carbon dioxide K-shell photoabsorption spectrum. The two absorption peaks correspond to C1s → 2πu* and C1s → Rydberg 3s state26. Carbon dioxide gas with 25 torr·mm pressure-length product is used in this measurement