Extreme ultraviolet (EUV) spectra from laser-produced tin plasmas have been recorded as a function of time
using an ISAN grazing incidence spectrograph to study the temporal evolution of the tin unresolved transition
array (UTA) responsible for the peak EUV emission. This paper reports the experimental as well as simulated
results for a 10 ns gate width with 2 ns time steps which confirm that the development and collapse of the
UTA follow the temporal behavior of the laser pulse. The self-absorption features at longer wavelengths are
observed particularly during plasma cooling and arise from lower ion stages ranging from Sn VI to Sn XI.
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