Knowledge Bank

The hydrogen bond OC--HI has been characterized by high resolution microwave and infrared spectroscopies in supersonic seeded molecular jets. Ground state molecular parameters determined by microwave pulsed FTIR supersonic jet techniques include:\begin{eqnarray*} B_{0}({MHz}) = 900.9522(1) D_{J}(kHz) = 2.519(1)\ C_{N}(kHz) = 0.94(18)\ \chi ({MHz}) = -1346.238(13) \chi_{J}(kHz) = -8.27(31)\end{eqnarray*} and derived quantities: r(C--I) $=4.285A\alpha =24.80$ k $\sigma (Nm-1)=1.71$ can be estimated from these analyses. Infrared diode laser investigations provide a band origin frequency $v0$ of $ v_{2}$ $C\equiv$ O stretching vibration at 2148.549040(29) $cm-1$ corresponding to a blue shift of 5.27728(37) $cm-1$ relative to free monomer CO. Excited state $B2=898.2728(33)$ MHz, and $DJ(2)=2.614(24)$ kHz, are evaluated. Experimental results and ab-initio calculations are used to investigate the influence of relativistic effects in this complex.""