Knowledge Bank

Time and ``site” resolved vibrational energy transfer from specific vibrationa1 levels of electronically excited ND $(A3\Pi )$ to and $\mathrm{<mrow\; data-mjx-texclass="ORD">12</mrow>}CO$ in solid Ar has been observed. The transfer quantum yield, and the nonexponential donor time-resolved population, both follow the theoretical expressions for dipole-dipole (F""{o}rster) kinetics. Transfer from $ND\ast (v=2)$ to $\mathrm{<mrow\; data-mjx-texclass="ORD">13</mrow>}CO$ is exothermic by only $13cm-1$, and occurs with rate $k\simeq 4.5\times 106sec-1$ at a distance of 17 {\AA}. Rates for three different near resonant transfer processes, in the energy gap range $\Delta$ E = $13-126cm-1$, experimentally follow an energy gap law of the form k $\alpha \exp [-\Delta E/29 cm-1]$. These rates are independent of temperature for $T\le 25\circ K$ in Ar.