Abstract
A differential broadening of the Λ doublets in the v=2–0 overtone band of the 2Π1/2 ground electronic state of NO in an Ar buffer gas has been observed by photoacoustic spectroscopy using a tunable color-center laser. The broadening coefficients for the f symmetry components are larger than for the e symmetry components by up to ∼6% for J∼16.5. This differential depends on J and vanishes at low J, implicating the anisotropy of the unpaired electron Π orbital in the plane of rotation. The 2Π3/2 transitions are slightly broader than the 2Π1/2 as a result of spin-flipping collisional relaxation. The observed line shapes also exhibit collisional or Dicke narrowing due to velocity-changing collisions.
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