Progress in Photon Science pp 321-341 | Cite as
Terahertz and X-Ray Emission from Clustered Plasma and Dynamics of the Cluster Formation in the Expanding Jet
Abstract
In this chapter we introduce our recent studies on terahertz (THz) and X-ray emission generated in an Ar gas-cluster jet under irradiation with high-intense ultrashort laser pulses. We carried out a numerical simulation of cluster formation processes in a supersonic jet produced under adiabatic extension of gaseous Ar into vacuum, which shows that the concentration ratios among non-clusterized Ar monomers, small-size Ar clusters and large-size Ar clusters significantly vary along the jet. The chapter presents experimental results on THz and X-ray emission generated by irradiation of the jet with intense femtosecond laser pulses at various downstream distances measured from the nozzle outlet along the axis of symmetry of the nozzle. It is shown that THz and X-ray emission from the jet is a useful tool for the study of clustering dynamics in the course of free expansion of gas through a nozzle into vacuum.
Keywords
Terahertz radiation X-ray emission Femtosecond laser pulses Gas-cluster Supersonic jet Cluster jet formation Clustering dynamics Rayleigh scattering Ionization potential Electron-ion collisions Mie resonance Quadrupole emission Plasma channelReferences
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