Preparation and experimental investigation of specialty of argon and krypton clusters

The Rayleigh scattering and Mach-Zehnder interferometry are employed to investigate the properties of argon and krypton clusters respectively. By comparing the size and density of the two kinds of clusters in detail, the factors of cluster formation are discussed. Varying the delay time between probe laser and nozzle valve, the temporal evolution of size and density is obtained, the density spatial distribution along nozzle axis with the background pressure from 1.2 MPa to 6.0 MPa is measured. Both size and density of the argon and krypton clusters reach max and the system is stable from 3 ms to 25 ms. In addition, the density increases linearly with background pressure, and decreases with the distance away from the nozzle throat.