Abstract
Substantial narrowing of the Doppler profile of molecular absorption lines is achieved in an effusive molecular beam from a capillary array nozzle probed with a broadly tunable diode laser propagating transverse to the flow. Hitherto unresolved Λ-doublet splittings in the fundamental v = 1 ← 0 band of NO for the 2 Π 1 2 electronic state are observed. Precision measurements of these and 2 Π 1 2 Λ- splittings are compared to recent theoretical models.
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