Abstract
Far-infrared amplified emission from the v=1 autoionizing levels of the ns (n=9–14), np (n=12–15) and nf (n=8–14) Rydberg states of NO is reported in the gas phase. The dominant emission process for nf is assigned as the nf→(n−1)g transition. Following the excitation of ns (n=11–14), the emission from (n−1)f energetically located above ns is detected. Following the excitation of np (n=12 and 13), the emission from (n−1)f is also detected. The absence of the emission from 11p leads to ∼3ps as a threshold lifetime of the upper state needed for amplification.
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