# THE ABSORPTION SPECTRUM OF $NO_{2}$ IN THE 5000-3700 {\AA} REGION

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 Title: THE ABSORPTION SPECTRUM OF $NO_{2}$ IN THE 5000-3700 {\AA} REGION Creators: Douglas, A. E.; Huber, K. P. Issue Date: 1964 Publisher: Ohio State University Abstract: Thorough inspection of the absorption spectra of both $N^{14}O_{2}$ and $N^{15}O_{2}$, photographed at room temperature in the region 5000-3700 {\AA} under moderately high resolution, has revealed a long progression of red degraded bands with comparatively simple structure. Most of the bands are strongly overlapped by complex structures, but the progression is particularly evident in the spectrum of the heavier isotope. The frequency interval $\Delta \nu \approx 890 cm^{-1}$ between successive bands remains nearly constant. From the large isotope shifts it must be concluded that the origin of the system is in the near infrared region around 8500 {\AA}. The rotational analysis of one of the $N^{14}O_{2}$ bands (3911 {\AA}) which is slightly diffuse and free from overlapping, shows that it arises from a $^{2}B_{1} (K=0)\leftarrow ^{2}A_{1} (K=1)$ transition in which $\bar{B}^{1}=0.378 cm^{-1}$. This result is strongly supported by the analysis of the sharp bands at longer wavelengths, which have been rephotographed on a large Ebert-type spectrograph. Description: Author Institution: Division of Pure Physics, National Research Council URI: http://hdl.handle.net/1811/14534 Other Identifiers: 1964-D-13