# NEW HIGH RESOLUTION STUDY OF THE 2491 {\AA} ELECTRONIC TRANSITION OF $NO_{2}$

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 Title: NEW HIGH RESOLUTION STUDY OF THE 2491 {\AA} ELECTRONIC TRANSITION OF $NO_{2}$ Creators: Huber, K. P. Issue Date: 1966 Publisher: Ohio State University Abstract: The $2491{\AA}$ parallel transition of $NO_{2} (^{2}B_{2}\leftarrow^{2}A_{1})$ has been rephotographed under high resolution on a large Ebert type spectrograph ($0.08 {\AA}/mm$). The analysis of the band has confirmed the results obtained earlier by Ritchie, Walsh and Warsop$^{1}$. In addition, the spin splitting in the subbands K = 2 to 6 has been observed. While for given N the splitting increases with K, it decreases within each subband as N increases. The line splitting is equal to about twice the value of the doublet splitting in the ground state levels. The latter was calculated from $Raynes'^{2}$ formula using known microwave $data^{3}$. Whether the observed splitting corresponds to the sum or the difference of upper and lower state splittings has not yet been established. However, on the short wavelength side of the 0 - 0 subband a small number of weak lines have been found which must be assigned to high N values of the 2 --- 0 and 3 --- 1 subbands. If the observation of these subbands can be extended to smaller N values, the determination of the sign of the upper state spin splitting may be possible. The reason for the occurrence of subbands with $\Delta K = 2$ will be discussed. Description: $^{1}$R. K. Ritchie, A. D. Walsh and P. A. Warsop, Proc. Roy. Soc. 266A, 257 (1962). $^{2}$W. T. Raynes, J. Chem. Phys. 41, 3020 (1961). $^{3}$G. R. Bird et al., J. Chem. Phys. 40, 3378 (1964). Author Institution: Division of Pure Physics, National Research Council, Ottawa URI: http://hdl.handle.net/1811/15024 Other Identifiers: 1966-I-3