Abstract
The NO molecule is among those unique molecules that have several excited states from which fluorescence can be observed. There are also allowed transitions coupling these states which permit the sequential pumping of NO. The two-photon laser-induced fluorescence (TP-LIF) technique takes advantage of this fact in producing blue-shifted fluorescence. The latter fluorescence, in contrast to the red-shifted fluorescence characteristic of single-photon laser-induced fluorescence (SP-LIF), permits massive discrimination against all conventional LIF noise sources. These include Rayleigh and Raman scatter and chamber wail and aerosol fluorescence. The latter two sources of noise, in particular, result in extensive broadband red-shifted fluorescence, which is impossible to eliminate totally in the SP-LIF technique.
© 1983 Optical Society of America
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