Nonthermal emission of energetic ions from a metal surface irradiated by extremely low-fluence femtosecond laser pulses

被引：21

作者：

Miyasaka, Yasuhiro ^{[1
]}

Hashida, Masaki

Ikuta, Yoshinobu

Otani, Kazuto

Tokita, Shigeki

Sakabe, Shuji

机构：

[1] Kyoto Univ, Adv Res Ctr Beam Sci, Inst Chem Res, Kyoto 6110011, Japan

来源：

PHYSICAL REVIEW B | 2012年 / 86卷 / 07期

关键词：

PERIODIC STRUCTURES; ABLATION; THRESHOLD; DYNAMICS;

D O I：

10.1103/PhysRevB.86.075431

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Energetic ions are emitted from a metal (copper) surface irradiated with femtosecond laser pulses even at extremely low laser fluences. The nonthermal interaction of the pulses with the metal surface is investigated by energy spectroscopy of ions emitted from the surface. Singly charged ions with energies of 180 eV are produced at low fluences of 80 mJ/cm(2), and the ion energy spectrum does not follow a shifted Maxwell-Boltzmann distribution. As the mechanism of ion acceleration, Coulomb explosion of nanoparticles on the target surface is proposed. This mechanism is supported by the fairly good agreement between calculated and experimental ion energy spectra and by the relationships of ion energy and ion emission amount with self-organized nanostructures formed on the irradiated surface.

引用

页数：5

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