The purpose of the present paper is to investigate the generation of soft X-ray emission from an anharmonic collisional nanoplasma by a laser–nanocluster interaction. The electric field of the laser beam interacts with the nanocluster and leads to ionization of the cluster atoms, which then produces a nanoplasma. Because of the nonlinear restoring force in an anharmonic nanoplasma, the fluctuations and heating rate of, as well as the power radiated by, the electrons in the nanocluster plasma will be notably different from those arising from a linear restoring force. By comparing the nonlinear restoring force state (which arises from an anharmonic cluster) with that of the linear restoring force (in harmonic clusters), the cluster temperature specifically changes at the resonant frequency relative to the linear restoring force, while the variation of the anharmonic cluster radius is almost identical to that of the harmonic cluster radius. In addition, it is revealed that a sharp peak of X-ray emission arises after some picoseconds in deuterium, helium, neon and argon clusters.

中文翻译：

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通过激光-纳米团簇相互作用从非谐波碰撞纳米等离子体发射软 X 射线

本论文的目的是研究通过激光-纳米团簇相互作用从非谐波碰撞纳米等离子体中产生软 X 射线发射。激光束的电场与纳米团簇相互作用并导致团簇原子电离，然后产生纳米等离子体。由于非谐波纳米等离子体中的非线性恢复力，纳米团簇等离子体中电子的波动和加热速率以及辐射的功率将与线性恢复力产生的电子有显着差异。通过比较非线性恢复力状态（由非谐簇引起）与线性恢复力状态（在谐波簇中），簇温度在相对于线性恢复力的共振频率处特别变化，而非谐簇半径的变化与谐簇半径的变化几乎相同。此外，还揭示了在氘、氦、氖和氩团簇中的一些皮秒后出现了一个尖锐的 X 射线发射峰。