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

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.