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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 signal acquisition of approximately 104 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.
James L. Kinsey (Tue,) studied this question.