Abstract
The rotational state-selective detection of nitrogen is demonstrated employing 2 + 2 multiphoton ionization through the intermediate ã 1Π( v' = 3) state, and the method is seen to be very sensitive. A comparison between experiment and theory is presented using intensity data from the resonantly enhanced multiphoton spectrum reported here and the CO-sensitized fluorescence spectrum previously recorded by another group. The relative line intensities are calculated using transition strength factors derived from the theory of two-photon absorption. Agreement is good and opens the possibility of performing state-selective experiments on a quantitative basis using this relatively simple technique. Reliable sample temperatures are obtained using graphical or deconvolution methods from spectral intensity data.
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