Knowledge Bank

Hyperfine splittings in the electron-spin-resonance spectra of $\mathrm{<mrow\; data-mjx-texclass="ORD">93</mrow>}$Nb atoms + $H2/D2$ in argon, krypton, and deuterium matrices 2-4K indicate that the NbH$2/NbD$2 molecule is being observed. However, the spectra indicate that the molecule has a doublet ground state, and if bent, it must be rotating in the solids. $Theory1$ favors a $\mathrm{<mrow\; data-mjx-texclass="ORD">4</mrow>}B1$ ground The hyperfine splittings and g values will be discussed in terms of molecular structure and bonding.