# A NEW BAND SYSTEM IN THE NEAR-ULTRAVIOLET SPECTRUM OF MAGNESIUM OXIDE

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 Title: A NEW BAND SYSTEM IN THE NEAR-ULTRAVIOLET SPECTRUM OF MAGNESIUM OXIDE Creators: Trajmar, Sandor; Ewing, George E. Issue Date: 1964 Publisher: Ohio State University Abstract: The apparent complexity and the previously observed irregular isotope shift in the near-ultraviolet band spectrum of magnesium $oxide^{1}$ gave ground for speculation that the bands may be caused by a polyatomic emitter or overlapping triplet transitions of MgO. The are spectrum of MgO in the $3750-3900 {\AA}$ region has been reinvestigated. Rotational lines of the $MgO^{16}$ and $MgO^{18}$ spectra have been measured from plates taken with a 21-ft. concavegrating spectrograph in the second order. It was found that the $C^{1}\Sigma-A^{1}\Pi$ system reported $earlier^{2}$ extends to about $3795 {\AA}$. The bands from $3795 {\AA}$ to the longer wave lengths are members of a $D^{1}\Delta-A^{1}\Pi$ system and from a zero sequence. The $\Lambda-doubling$ is clearly observed in the $R_{*, *}$, band head region. The preliminary values of the rotational constants and vibrational frequency for the new $D^{1}\Delta$ state are: $B_{o} = 0.499, B_{1} = 0.494, D_{o} = D_{1} = 1.3\times 10^{-6}$ and $\omega_{e} = 632 cm^{-1}$. Description: $^{1}$ D. Pesic, Proc. Phys. Soc. London A 76, 844 (1960). $^{2}$ L. Brewer, S. Trajmar and R. Berg, The Astrophysical Journal 135, 455 (1962). Author Institution: California Institute of Technology, Jet Propulsion Laboratory, 4800 Oak Grove Dr; $^{\dag}$ Present address: Department of Chemistry, Indiana University, Bloomington, Indiana URI: http://hdl.handle.net/1811/14581 Other Identifiers: 1964-I-07