Recombination reactions of 5-eV O(3P) atoms on a MgF2 surface.

A source of hyperthermal, ground-state, impurity-free, atomic oxygen of an energy variable in the range 2\char21{}100 eV has been developed. Experimental results are presented of emission spectra in the wavelength range 250\char21{}850 nm produced by collisions of 5-eV O${(}^{3}$P) atoms with adsorbed NO and CO molecules on a ${\mathrm{MgF}}_{2}$ surface. The emission with adsorbed CO is due to the B\ifmmode \tilde{}\else \~{}\fi{}\ensuremath{\rightarrow}X\ifmmode \tilde{}\else \~{}\fi{} transition in ${\mathrm{CO}}_{2}$, while that with NO is consistent with the continuum B\ifmmode \tilde{}\else \~{}\fi{}\ensuremath{\rightarrow}X\ifmmode \tilde{}\else \~{}\fi{} and A\ifmmode \tilde{}\else \~{}\fi{}\ensuremath{\rightarrow}X\ifmmode \tilde{}\else \~{}\fi{} emissions in ${\mathrm{NO}}_{2}$.