Abstract
We have measured the lifetime of the a'' $^{1}\mathrm{\ensuremath{\Sigma}}_{\mathit{g}}^{+}$(v=0) level of ${\mathrm{N}}_{2}$ by monitoring through laser-induced vacuum ultraviolet fluorescence its population as a function of time after pulsed-electron excitation. The lifetime was measured for several rotational levels and found to be independent of the rotational level. The average lifetime is 3.49(10) \ensuremath{\mu}s. This lifetime suggests that predissociation, not radiation, is the main decay mode for this metastable level.
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