Knowledge Bank

Recently the New Brunswick group (accepted).} reported on the detection and analysis of the $B3$$\Phi 4-X3\Phi 4$ band system of IrF. The free-jet expansion conditions limited the spectral resolution to approximately 200 MHz, which was insufficient to fully resolve the $\mathrm{<mrow\; data-mjx-texclass="ORD">191</mrow>}$Ir(I=3/2), $\mathrm{<mrow\; data-mjx-texclass="ORD">193</mrow>}$Ir(I=3/2)and $\mathrm{<mrow\; data-mjx-texclass="ORD">19</mrow>}$F(I=1/2)magnetic hyperfine splitting. Here we report on the analysis of the same band system recorded under molecular beam conditions which resulted in a resolution of 40 MHz. A simple molecular orbital correlation diagram is used to rationalize the determined parameters of IrF and the isovalent molecules RhF {\textbf{121}} 2591, 2004.} and CoF {\textbf{127}} 194308, 2007.}.