Knowledge Bank

Fixed frequency Laser photoelectron Spectrometry and variable frequency laser photodetachment spectroscopy of the ozonide ion, $03\mathrm{<mrow\; data-mjx-texclass="ORD">-</mrow>}$, have been performed. The electron affinity of ozone is measured to be $EA(O3)=2.1024(25)$ eV. Progressions in the spectra are analyzed to yield the symmetric stretching frequency of the ozonide ion, $\nu 1(O3\mathrm{<mrow\; data-mjx-texclass="ORD">-</mrow>})-983(24)cm-1$. Two dimensional Franck-Condon analysis gives the bond length of the negative ion to be greater and the angle to be slightly less than that of the neutral. While no evidence was found for a long-lived excited state of $O3\mathrm{<mrow\; data-mjx-texclass="ORD">-</mrow>}$, a new electronic state of neutral ozone is found perhaps 0.7 to 1.1 eV above the ground state. A model for the photodissociation of $O3\mathrm{<mrow\; data-mjx-texclass="ORD">-</mrow>}$ is proposed to explain why the spectra fail to show a progression in the symmetric bending vibrational mode.