![]() An important point for diagnostic purposes is that both the VUV intensity and peak frequency shift are dependent on O atom concentration. Oxygen atoms were also detected in the same manner following photodissociation of NO 2. The observed concentration dependent frequency shifts of the laser excitation spectrum verified the assignment of THG. Ground state O( 3 P J) atoms, generated using a microwave discharge, were monitored by focusing a 391-nm dye laser beam into the post-discharge region and observing radiation at 130 nm, near resonant with theģ s S 3 1 ∘ → 2 p 4 P 3 J transition, produced along the laser propagation direction.
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