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

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.