Charging of metal clusters in helium droplets exposed to intense femtosecond laser pulses

被引：33

作者：

Doeppner, T. ^{[1
]}

Diederich, Th. ^{[1
]}

Przystawik, A. ^{[1
]}

Truong, N. X. ^{[1
]}

Fennel, Th. ^{[1
]}

Tiggesbaeumker, J. ^{[1
]}

Meiwes-Broer, K.-H. ^{[1
]}

机构：

[1] Univ Rostock, Inst Phys, D-18051 Rostock, Germany

来源：

PHYSICAL CHEMISTRY CHEMICAL PHYSICS | 2007年 / 9卷 / 33期

关键词：

D O I：

10.1039/b703707d

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

We review the strong field (10(13) - 10(16) W cm(-2)) laser excitation of metal clusters (Cd-N, Ag-N and Pb-N) embedded in He nanodroplets. Plasmon enhanced ionization obtained by stretching the laser pulses to several hundreds of femtoseconds or by using dual pulses with a suitable optical delay leads to a Coulomb explosion of highly charged atomic ions. The charging dynamics can be well described by corresponding semiclassical Vlasov simulations. The influence of the He environment on the ionization process and on the final charge distribution is discussed. Evidence is found that He2+ is generated in collisions with highly charged metal ions. In contrast, singly and doubly charged ions with low recoil energies induce the formation of He snowballs with a distinct shell structure around the ion. Laser intensity thresholds for snowball formation and for the ionization of clusters are investigated by applying intensity selective scanning.

引用

页码：4639 / 4652

页数：14

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