Knowledge Bank

Beams of alkali metal atoms and ozone molecules at high dilution in argon were condensed on a tilted copper wedge at $160K$ and examined by argon plasma laser excitation. Very intense bands red shifted near $1010cm-1$ showed small alkali metal effects and appropriate oxygen-18 shifts for assignment to the $\nu 1$ symmetric oxygen-oxygen mode of the ozonide ion in the $M+O3-$ species. The intense fundamental and a regular progression of overtones out to $4\nu 1$ suggest that these spectra are probably due to the resonance Raman effect. Vibrational analysis for six isotopic ozonide species produced the oxygen-oxygen force constant $4.18\pm 0.11mdyn/\backslash AA$. The spectroscopic value for the heat of atomization of the ozonide ion calculated from the vibrational constants $\omega 1=1028.2$ $cm-1$ and $X11=4.95$ $cm-1$ for $Cs+O3$ is 153 kcal/mole, which agrees well with the thermodynamic value.