Nitrogen Quadrupole Coupling Measurements on ON-NO2 Using the Flygare-Balle Pulsed-Beam Spectrometer

Article abstract of DOI:10.1021/ja00389a007

High-resolution measurements of the 1₀₁ <- 0₀₀, 2₁₂ <- 1₁₁, 2₀₂ <- 1₀₁, 2₁₁ <- 1₀, 3₁₂ <- 3₁₃, and 4₁₃ <- 4₁₄ transitions in the ON-NO2 complex were made by using a pulsed-beam, Fourier transform microwave spectrometer.Nearly all hyperfine structure components were resolved on observed transitions except for the 2₀₂ <- 1₀₁ group.The quadrupole coupling tensors in the principal axis system were determined for both nitrogen atoms.The nitrogen quadrupole coupling components for the NO group are eQq_aa = -1.7766 +/- 0.0037 MHz and eQq_bb = 0.0585 +/- 0.0021 MHz.For the NO2 group eQq_aa = -0.5260 +/- 0.0035 MHz and eQq_bb = -4.1941 +/- 0.0018 MHz.The rotational constants obtained are A = 12412 +/- 22 MHz, B = 4226.530 +/- 0.012 MHz, and C = 3152.966 +/- 0.012 MHz.Rotational transition frequencies and estimates of spin-rotation interaction strengths are given.The observed quadrupole coupling strengths are substantially different from those observed for the free NO and NO2 molecules.