Knowledge Bank

Using sequential laser pulses, the OODR transition of $I2$ has been recorded by polarization labelling spectroscopy at the dispersion of a 3.4m spectrograph. In these experiments, the v^{\prime} = 26-35 levels of the intermediate B state are pumped by the initial pump pulse. The probe pulse then completes the excitation to the higher state, which initial results indicate consists of a number of neighbouring states, in agreement with the observations of Danyluk and $King1$. Franck-Condon factors cause the well-known E state, with $T0=41355.8$ $cm-1$, to dominate the spectrum for excitation through levels of the B state at the lower end of the $v\prime$ range given above.