Kinetic spectroscopy in the far vacuum ultraviolet. Part I: Detection of (2p 5) 2P [formula omitted], [formula omitted] fluorine atoms using atomic resonance spectrometry in the wavelength range 95–98 nm

Abstract

A new experimental system for atomic resonance spectrometry at λ < 105 nm in a discharge-flow system is described. The spectrum of a fluorine resonance lamp has been studied, and possible precursors for the 2p 4 3s excited F atoms formed are suggested. Ground state (2p 5 2P 3 2 ) and J-excited 2P 1 2 F atoms have been detected for the first time in resonance absorption and fluorescence using the first resonance transitions with wavelengths between 95.2 and 97.8 nm. Preliminary measurements (using both 4P- 2P and 2P- 2P lines) of the variations with concentration of absorption intensity by ground state F 2P 3 2 and by J-excited F 2P 1 2 atoms are reported; F atom concentrations were measured using a titration method based on the rapid reaction, F + Cl 2 → FCl + Cl.