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

Loading...
Thumbnail Image

Date

1964

Journal Title

Journal ISSN

Volume Title

Publisher

Ohio State University

Research Projects

Organizational Units

Journal Issue

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

Keywords

Citation