The two-photon absorptivity of rotational transitions in the A 2Σ+(v′ = 0)–X 2Π(v′′ = 0) gamma band of nitric oxide

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Abstract
A predominantly single‐mode pulsed dye laser system giving a well‐characterized spatial and temporal output suitable for absolute two‐photon absorptivity measurements was used to study the NOγ(0,0)S11+R21(J\ = 7‐1/2) transition. Using a calibrated induced‐fluorescence technique, an absorptivity parameter of 2.8±1.4×10−51 cm6 was obtained. Relative strengths of other rotational transitions in the γ(0,0) band were also measured and shown to compare well with predicted values in all cases except the 012(J\ = 10‐1/2) transition.