Two-dimensional imaging of laser-induced fluorescence: OH in a plasma-generated molecular beam scattering from a silicon surface

Two-dimensional (2-D) imaging is a significant improvement to the IRIS (imaging of radicals interacting with surfaces) technique for measuring the reactivity of plasma-generated radicals at surfaces. Several interesting phenomena resulting from the effects of saturation of the optical transition and of molecular translation during the radiative lifetime of OH have now been observed directly.