Abstract

Pump modulated laser absorption spectroscopy was used to measure the cesium ${5^2}{D_{5/2}} \to {10^2}{F_{5/2,7/2}}$ line shape. Alkali density in an optically pumped low pressure cell was increased from 0.5 to $85 \times {10^{12}}\;{{\rm cm}^{- 3}}$, resulting in a factor of 200 increase in Lorentzian width due to Stark broadening (${2.76}\;{\rm GHz}/{10^{12}}\;{{\rm cm}^{- 3}}$). The observed red shift is consistent with literature, and the shift-to-width ratio $\delta /\gamma = - 0.356 \pm 0.015$ informs an electron temperature of $1820 \pm 100\;{\rm K}$. A linear trend between alkali density and electron density is seen, suggesting that electron impact is the primary plasma production mechanism. A maximum ionized concentration of 28% was observed.

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