Fourier Transform Doppler Spectroscopy: A New Means of Obtaining Velocity-Angle Distributions in Scattering Experiments.

摘要

A new method is presented for obtaining three-dimensional velocity distributions in scattering measurements. This method, which affords a potential improvement in the rate of single acquisition of approximately 10,000 over conventional molecular beam techniques, utilizes Doppler profiles for light absorption, measured as a function of the direction of the incident light. A unique inversion of the set of Doppler profiles into the three dimensional velocity distribution is accomplished by a straightforward Fourier transformation procedure. A numerical example, illustrating the sensitivity and stability of the data-analysis techniques, is presented. New interpretations are obtained for data from gas phase experiments employing the Doppler effect for velocity selection or analysis. These indicate that such measurements can give a much closer approach to information of molecular beam quality than has previously been thought. (Author)