Strong-field ionization and Coulomb explosion of argon clusters by few-cycle laser pulses

被引：21

作者：

Mathur, D. ^{[1
]}

Rajgara, F. A. ^{[1
]}

Holkundkar, A. R. ^{[2
]}

Gupta, N. K. ^{[2
]}

机构：

[1] Tata Inst Fundamental Res, Bombay 400005, Maharashtra, India

[2] Bhabha Atom Res Ctr, Laser & Neutron Phys Sect, Bombay 400085, Maharashtra, India

来源：

PHYSICAL REVIEW A | 2010年 / 82卷 / 02期

关键词：

GENERATION; INTENSE; FS; COMPRESSION; DYNAMICS; IONS;

D O I：

10.1103/PhysRevA.82.025201

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

Energy distributions are measured for ions emitted upon Coulomb explosion of Ar-n clusters (n = 400-900) upon irradiation by intense three-cycle pulses (10 fs) of 800-nm laser light of peak intensity 5 x 10(14) Wcm(-2). With few-cycle pulses, there is insufficient time for the cluster to undergo expansion; this results in overall dynamics that are significantly different from those in the many-cycle regime. The peak ion energies are much lower than those obtained when 100-fs pulses of the same intensity are used; they are almost independent of the size of the cluster (over the range 400-900 atoms). Ion yields are measured to be larger in the direction that is perpendicular to the laser-polarization vector than along it. Model molecular dynamics calculations are used to qualitatively rationalize this unexpected anisotropy in terms of shielding by a spatially asymmetric electronic-charge cloud within the cluster.

引用

页数：4

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