Detection of atomic oxygen and hydrogen in the vacuum UV using a frequency-doubled, Raman-shifted dye laser
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 greater than 0.1 micro-J, pulse length less than 2 ns), the densities of atomic oxygen and hydrogen, produced by dissociation of O(2) or H(2) on a hot tungsten wire or in sputtering devices, have been measured by resonance fluorescence at lambda = 130.2 nm and at lambda = 121.5 nm, respectively. The detection limit in the experimental setup has been estimated near 1.0 E7/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 eighth 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.
Bibliographic Reference: Article: Journal of the Optical Society of America B, Vol. 9 (1992) No. 12, pp. 2137-2141
Record Number: 199310519 / Last updated on: 1994-11-29
Original language: en
Available languages: en