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In this article, we report rather long time emission ($\sim$ 250 $\mu s$)from aluminum neutrals (Al I) in ns laser produced plasma in the presence ofambient argon. The study is carried out with varying laser power density,background pressure, and the distance from the target. Slow and fast peakcomponents in the emission spectra observed at earlier times are well reported.However, interestingly a very long delayed emission is also observed for thefirst time which depends on laser power density, distance from the target,ambient gas and pressure. The emission is observed from Al neutrals only. Themost likely mechanism of this emission appears to be the excitation andsubsequent emission from Al neutrals as a result of energy transfer frommetastables of the ambient gas.

On the delayed emission from laser produced aluminum plasma under argon environment