Knowledge Bank

Using the double resonance technique of ENDOR, hyperfine and quadrupole coupling parameters have been obtained for the $X7\Sigma$ electronic state of the $\mathrm{<mrow\; data-mjx-texclass="ORD">55</mrow>}Mn1H$ molecule isolated in solid argon at $4\circ K$. From pumping the $MS=\pm 1-0,MI=\pm 5/2$ or $\pm 3/2$ ESR lines, absorptions were observed from $△MI$ transitions within the $MS=0$ and $\pm 1$ levels. From these frequencies an improved $A1(55Mn)$ was derived and values for $Q\prime$, the nuclear electric quadrupole parameter, and the $\mathrm{<mrow\; data-mjx-texclass="ORD">1</mrow>}H$ hyperfine parameter, sH, were derived. Combining information from ESR $spectra1$ with that from ENDOR yields the following: $g1=2.000(1),A1(55Mn)=334(6)MHz,A1(55Mn)=300(3)MHz,Q\prime (55Mn)=-11.81(2)MHz,[\ast \ast H]=6.8(1)MHz,b2o=D=-0.003cm-1$.