Spectroscopic determination of W I and W II oscillator strengths

Summary form only given, as follows. Oscillator strengths of 43 W I and 27 W II lines in the wavelength range 240-560 nm have been measured with a wall-stabilized arc. The arc was operated at 10-80 A in argon at atmospheric pressure with an admixture of tungsten hexafluoride. A set of relative W I and W II f-values was determined by a combination of emission and absorption measurements with a special optical setup. The qualities of these measurements do not require any assumptions concerning the plasma state. The relative set of 43 W I lines has been converted to an absolute scale by means of radiative lifetimes. The overall uncertainties of these oscillator strengths are within 10% for strong up to 36% for weak lines. The relative oscillator strengths of 9 W II lines have also been converted by using the radiative lifetimes of the upper levels. Because of missing lifetime data the absolute oscillator strengths of 18 W II lines had to be determined with the aid of temperature measurement under the assumption of a Boltzmann distribution. The absolute error for these f-values lies between 7% and 17%.