A COEFFICIENTS OF THE A1-DELTA STATES OF NF AND NH

The Einstein A coefficients of the paramagnetic species NF(a1-DELTA) and NH(a1-DELTA) have been measured in the gas phase. The excited states were detected by both optical emission spectroscopy and electron paramagnetic resonance (EPR) spectroscopy. The optical detection systems were calibrated by using luminescence from the emission of either the air afterglow reaction or O2(a1-DELTA). The Einstein A coefficient of NF(a1DELTA) was determined to be 0.15 (+/- 0.04) s-1, in good agreement with a previous measurement. This work is believed to be the first experimental determination of the gas-phase Einstein A coefficient of NH(a1-DELTA). Our value for this A coefficient is 3.7 (+/- 0.6) s-1. In addition, we believe that this is the first report of the detection of NH(a1-DELTA) in the gas phase using EPR.