Knowledge Bank

An argon laser $(\lambda =4880$ and 5145 {\AA}) has been used to excite fluorescence from $Na2O$. The spectra extend from 4500 to 8500 {\AA}. In a typical spectrum one observes what appear to be two band systems, the stronger of which is localized around the laser line. A weaker system extends from 6500 to 8500 {\AA}. Recently Grow and $pitzer1$ have performed calculations to determine the structure and spectra associated with $Li2O$. There is an outstanding correlation between the current work and this study. On the basis of this correlation, it would appear that the laser pump correspond to the excitation [Na_{2} 0 \tilde{X} ^{1}\Sigma g^{+}\stackrel{h\nu}{\rightarrow} Na_{2}O^{}\ ^{1}\Sigma_{u} ] with subsequent emission to both the ground $X~1\Sigma +$ and a very low-lying excited state [Na_{2}0^{}\ ^{1}\Sigma_{u_{\searrow}Na_{2}0^{} \tilde{B}^{1}+h\nu^{\prime}} \rightarrow Na_{2}0 \tilde{X} ^{1}\Sigma_{g}^{+} h\nu\ Na_{2}0^{} \tilde{B} 1 + h\nu^{\prime}] The analysis of the observed spectral features will be discussed.