  A spectrometer for the measurement of spontaneous Rayleigh-Brillouin
scattering line profiles at ultraviolet wavelengths from gas phase molecules
has been developed, employing a high-power frequency-stabilized UV laser with
narrow bandwidth (2 MHz). The UV light from a frequency-doubled
titanium:sapphire laser is further amplified in an enhancement cavity,
delivering a 5 Watt UV-beam propagating through the interaction region inside a
scattering cell. The design of the RB-scattering cell allows for measurements
at gas pressures in the range 0-4 bar and at stably controlled temperatures
from -30 to 70 degree Celsius. A scannable Fabry-Perot analyzer with instrument
resolution of 232 MHz probes the Rayleigh-Brillouin profiles. Measurements on
N2 and SF6 gases demonstrate the high signal-to-noise ratio achievable with the
instrument, at the 1% level at the peak amplitude of the scattering profile.
