Knowledge Bank

The spectroscopy and dynamics of $I2$-Ne have been re-examined using OODR and fluorescence depletion techniques. Action spectra for $I2(B,\nu )-Ne$, detected by monitoring the $I2(B,\nu -1)$ predissociation fragments, show that the $\Delta \nu =-1$ predissociation channel is suppressed for levels above $\nu =33$, and closed for $\nu >36$. From these data we obtained a revised estimate for the dissociation energy for $I2(B)-Ne$ of $D0=57.5cm-1$. Action spectra for $I2(B,\nu =34)-Ne$, detected by monitoring $I2(B,\nu =33)$ fragments, revealed a progression of nine inter-molecular vibrational levels that had not been observed previously. These levels have been assigned to T-shaped or line ar geometries of $I2(B,\nu =34)-Ne$. Assignments were based on characteristic vibrational distributions exhibited by the $I2(B,\nu -\Delta \nu )$ predissociation fragments. Fluorescence depletion measurements show that all of the bands in the action spectrum originate from a common ground state level. Furthermore, the one atom cage effect fluorescence from $I2(B)$-Ne can be depleted by transitions from the zero-point level of $I2(X)$-Ne. These observations show that the ground state wa vefunction is delocalized, sampling both the T-shaped and linear configurations of the complex.