Abstract
The fundamental band of NO has been investigated by the laser magnetic resonance method, in which the absorption lines from an NO sample located inside the laser cavity were Zeeman tuned into resonance with fixed CO laser transitions. Saturation dips with a width of <2 MHz were observed, allowing the resolution of hyperfine and Λ-doubling structure in the NO spectrum. Transitions due to the weak 2-1 “hot” band and the 2 Π 1 2 ← 2 Π 1 2 satellite band of 14N 16O were observed, as were transitions due to the 15N 16O, 14N 18O, and 14N 17O isotopic species in natural abundance. Data from the present work were combined with previous measurements to obtain a consistent set of vibration-rotation parameters for five isotopic species of NO. An infrared-radiofrequency double-resonance spectrum was observed which allowed the precise (∼20 kHz) measurement of some hyperfine Λ-doubling transitions within the v = 1 state of 14N 16O.
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