We have determined absorption oscillator strengths for rotational transitions of the C2Π(0)-A2Σ+(0) band of NO, which has been detected in the upper atmosphere of Venus. The molecular quantum defect orbital method has been used in the calculation of the electronic transition moment and the Rydberg–valence interaction between the C2Π(v = 0) and the B2Π (v = 7) states has been considered. Considerable deviations from normal intensity distribution of the rotational lines have been found at J 5.5. As far as we know, the present line f-values are reported here for the first time. These data may be useful in the interpretation of the observations obtained by the Visible and Infrared Thermal Imaging Spectrometer instrument on the Venus Express spacecraft.
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