Abstract

Tunable radiation between 130.6 and 121.5 nm has been generated with a frequency-doubled dye laser, the wavelength of which has been shifted by stimulated Raman scattering in molecular hydrogen. With the eighth and ninth anti-Stokes Raman lines (energies > 0.1 μJ, pulse length < 2 ns), the densities of atomic oxygen and hydrogen, produced by dissociation of O₂ or H₂ on a hot tungsten wire or in sputtering devices, have been measured by resonance fluorescence at λ = 130.2 nm and at λ = 121.5 nm, respectively. The detection limit in our experimental setup has been estimated near 10⁷/cm³. The corresponding spectral profiles have been determined with a resolution of at best 0.1 cm⁻¹. With a Raman cell cooled in liquid nitrogen, the shift and broadening of the 8th anti-Stokes line have been measured as a function of the hydrogen pressure between 300 and 1000 mbars, through the apparent profile of the O i line.

© 1992 Optical Society of America

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