Abstract

The 193-nm ArF pulsed laser photolysis of HNCO, NH, and N₂H₄ produced NH(a¹Δ). Its lifetime was measured as a function of quenching species concentration by LIF using the a¹Δ → c¹π transition near 325 nm. The rate coefficients for quenching were found to be 7.5 ± 0.6 × 10⁻¹⁴ for N₂, 2.9 ± 0.6 × 10⁻¹² for H₂, 7.3 ± 1.0 × 10⁻¹³ for HF, 6.3 ± 1.0 × 10⁻¹³ for F₂, 1.62 ± 0.16 × 10⁻¹¹ for HNCO, 1.10 ± 0.08 × 10⁻¹⁰ for NH₃, 1.7 ± 0.2 × 10⁻¹⁰ and <10⁻¹⁵ for He.

© 1986 Optical Society of America