New Data on the Relaxed Excited State of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>F</mml:mi></mml:math>Center

Abstract

Ionization energies $\ensuremath{\Delta}E$ and lifetimes ${\ensuremath{\tau}}_{R}$ of the excited state of the $F$ center have been measured in various alkali halides. The experimental values of $\ensuremath{\Delta}E$ have been plotted versus ($\frac{{m}^{*}}{m}$) ($\frac{1}{{{\ensuremath{\epsilon}}_{S}}^{2}}$), following Fowler's idea that in emission the excited-state wave function is very broad. The hydrogenic model seems to fit the data very well, and Fowler's theory finds strong experimental support.