Abstract
We report what is to our knowledge the first two-photon excitation spectroscopy of molecular fluorine. The F 1Πg and f 3Πg states are excited with two photons in the range of 206–212 nm. Detection is through vacuum ultraviolet (VUV) fluorescence or ionization. Measurement of the fluorescence spectrum with a VUV spectrometer indicates that the VUV fluorescence occurs on the 157 nm F2 laser transition frequency. Using our spectra and the data of Porter [J. Chem. Phys. 48, 2071 (1968)] we report improved spectroscopic constants for vibrational levels in the F, f, and I 1Σu+ states.
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