Knowledge Bank

The PFI-ZEKE spectrum of Be$\mathrm{<mrow\; data-mjx-texclass="ORD">2</mrow>}$O$\mathrm{<mrow\; data-mjx-texclass="ORD">+</mrow>}$ ion was recorded to obtain accurate ionization energy for Be$\mathrm{<mrow\; data-mjx-texclass="ORD">2</mrow>}$O and vibrational frequency data for Be$\mathrm{<mrow\; data-mjx-texclass="ORD">2</mrow>}$O$\mathrm{<mrow\; data-mjx-texclass="ORD">+</mrow>}$. A short progression of the bending mode was observed, which included bands involving odd changes in the vibrational quanta. This observation indicates that the ion and/or the intermediate state used in the excitation process deviate from D$\_\{\backslash infty\{\}\}h\}$ symmetry.