Absolute total cross sections for the photodissociation ofAr2+,Kr2+,Xe2+, KrN2+, and KrN+from 565 to 695 nm

Absolute measurements have been made of total cross sections for the photodissociation of $\mathrm{Ar}_2^{}{}_{}{}^{+}$, $\mathrm{Kr}_2^{}{}_{}{}^{+}$, and $\mathrm{Xe}_2^{}{}_{}{}^{+}$ over the photon wavelength range 565-695 nm. A drift-tube mass-spectrometer apparatus was used with a tunable dye laser for these measurements. Calculations have been made of the bound-free Franck-Condon factors between the relevant ground and dissociating states of $\mathrm{Ar}_2^{}{}_{}{}^{+}$ and a comparison is made to the photodissociation results. It is shown that the photodissociation measurements provide a sensitive test of ionatom potential curves and that the absolute value of the transition dipole matrix element can be obtained from a match to the experimental data. In addition, we have obtained photodissociation cross sections for Ar$\mathrm{N}_2^{}{}_{}{}^{+}$, Kr$\mathrm{N}_2^{}{}_{}{}^{+}$, and Kr${\mathrm{N}}^{+}$.