Abstract
The first member of the 1 Σ + u Rydberg series of N 2, c′ 4- X, has been studied in absorption using a 6.65 m vacuum spectrograph. Rotational analyses of the (0, 0) band of the c′ 4- X as well as the (1, 0) band of the b′- X are given. Mutual perturbation between c′ 4(0) and b′(1) levels has been studied as a homogeneous interaction. The results were compared with the previous work in absorption and in emission, and confirmed the identity of Worley's c state and Gaydon's p′ state as the c′ 4(0) 1 Σ + u state.
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