Photodissociation and photodetachment of molecular negative ions. V. Atmospheric ions from 7000 to 8400 Å

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Abstract
Measurements of the photodestruction cross sections for a number of parent and first hydrate negative ions of atmospheric importance have been extended to the wavelength range from 7000 to 8400 Å, using a drift tube mass spectrometer and a tunable dye laser. Most of these ions do not dissociate or detach at these wavelengths; upper limits smaller than 1.0×10−19 cm2 are established for the photodestruction cross sections of O−3, O−2⋅H2O, O−3⋅H2O, CO−3, CO−4, CO−4⋅H2O, HCO−3, HCO−3⋅H2O, O−2⋅NO, O−2⋅NO⋅H2O, and NO−2⋅H2O. Thresholds for the photodestruction of CO−3⋅H2O and O−4 are observed at photon energies of 1.67 eV and 1.57 eV, respectively, and the cross sections for these ions have been measured at higher photon energies.