The laser-cluster interaction has been an important research field for decades, which would play an important role in understanding the laser-matter interaction. In order to generate satisfactory cluster sources, all factors that would affect the generation of the clusters should be understood. In this paper, linearly chirped spectral scattering is employed to study the size of the clusters during the process. And also, low density and large sized clusters is observed, which could be important clean targets in future experiments.