1：Experimental Design and Method Selection:

The experiment involved scattering a rubidium (Rb) atomic beam on paraf?n ?lms prepared in various ways. The angular and velocity distributions of scattered atoms were measured using laser-induced fluorescence. The films were characterized by atomic force microscopy (AFM) and x-ray diffraction (XRD) to analyze their surface morphologies and crystal structures.

2：Sample Selection and Data Sources:

The samples included paraf?n ?lms prepared by dip coating and vapor deposition on different substrates. The atomic beam was generated from an oven and collimated using slits before interacting with the films.

3：List of Experimental Equipment and Materials:

Equipment included an oven for generating the Rb atomic beam, slits for collimation, a rotational and translational stage for film positioning, probe and pump lasers for fluorescence and polarization measurements, a CCD camera for fluorescence detection, and AFM and XRD for film characterization.

4：Experimental Procedures and Operational Workflow:

The atomic beam was directed onto the films, and scattered atoms were detected using laser-induced fluorescence. The angular and velocity distributions were measured by scanning the probe laser position and varying its frequency, respectively. The spin polarization of the incident and scattered atoms was compared to assess the films' anti-spin-relaxation performance.

5：Data Analysis Methods:

The angular distributions were analyzed for consistency with Knudsen’s cosine law, and the velocity distributions were fitted with Maxwell’s distribution to determine the temperature of the scattered atoms.