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We demonstrate anion mass spectrometry using the Hefei synchrotron radiation source to investigate the ion-pair dissociation processes of molecules. The efficiency curve of the O- anionic product via ion-pair dissociations of CO2 is recorded with tunable extreme vacuum ultraviolet photons (energy: 19. 70-22.24 eV) and compared with the spectrum available in the literature. The possible dynamics of CO2 + hv → CO+ + O- in this energy range is discussed.