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−. 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 OI line.
© 1992 Optical Society of America
P. Bogen, Ph. Mertens, E. Pasch, and H. F Döbele, "Detection of atomic oxygen and hydrogen in the vacuum UV using a frequency-doubled, Raman-shifted dye laser," J. Opt. Soc. Am. B 9, 2137-2141 (1992)