Knowledge Bank

AT 6328 {\AA} The extent of the magnetic field induced quenching of the fluorescence from the $(v\prime =6,J\prime =32)$ and $(v\prime =11,J\prime =128)$ levels of the B $\mathrm{<mrow\; data-mjx-texclass="ORD">3</mrow>}\Pi (Ou+)$ state of $I2$ has been measured. A He/Ne laser operating at 6328 {\AA} has been used to excite the fluorescence. Combining these measurements with earlier results obtained for the higher vibrational levels allows us to determine the shape of a $Ou-$ repulsive potential energy curve. Since the $v\prime =6$ level is observed to be quenched much more strongly than the levels of higher $v\prime$, this $Ou-$ curve crosses the B-state curve at a low $v\prime$ value.