Knowledge Bank

The excited states of $O2$ in 100-135 nm region consists of many Rydberg states which are still not well understood. We have investigated the exited states of $O2$ dissociated into $O(1D)+O(3P)$. The experiment was conducted in a gas cell using the synchrotron radiation as the excitation source. $O(1D)$ was detected by the infrared emission at 762 nm produced from the $O2(b1\Sigma g+)$ formed by the energy transfer process from $O(1D)$ to $O2$. A spectrum between 105 and 130 nm for producing $O(1D)$ was obtained, which revealed the vibrational progression of the $n3\Sigma u-$ states for n=2 to 4. By comparing with the absorption spectrum, the $\mathrm{<mrow\; data-mjx-texclass="ORD">3</mrow>}\Pi u$ state correlated with $O(3P)+O(3P)$ was also obtained.