Novel Collective Autoionization Process Observed in Electron Spectra of He Clusters

被引：61

作者：

Ovcharenko, Y. ^{[1
]}

Lyamayev, V. ^{[2
]}

Katzy, R. ^{[2
]}

Devetta, M. ^{[3
,4
]}

LaForge, A. ^{[2
]}

O'Keeffe, P. ^{[5
]}

Plekan, O. ^{[6
]}

Finetti, P. ^{[6
]}

Di Fraia, M. ^{[6
,7
]}

Mudrich, M. ^{[2
]}

Krikunova, M. ^{[1
]}

Piseri, P. ^{[3
,4
]}

Coreno, M. ^{[5
,6
]}

Brauer, N. B. ^{[8
]}

Mazza, T. ^{[9
]}

Stranges, S. ^{[10
,11
]}

Grazioli, C. ^{[6
,11
,12
]}

Richter, R. ^{[6
]}

Prince, K. C. ^{[6
,11
]}

Drabbels, M. ^{[8
]}

Callegari, C. ^{[6
]}

Stienkemeier, F. ^{[2
]}

Moeller, T. ^{[1
]}

机构：

[1] Tech Univ Berlin, Inst Opt & Atomare Phys, D-10623 Berlin, Germany

[2] Univ Freiburg, Inst Phys, D-79104 Freiburg, Germany

[3] Univ Milan, CIMAINA, I-20133 Milan, Italy

[4] Univ Milan, Dipartimento Fis, I-20133 Milan, Italy

[5] CNR, Ist Metodol Inorgan & Plasmi, I-00016 Monterotondo, Italy

[6] Elettra Sincrotrone Trieste, I-34149 Trieste, Italy

[7] Univ Trieste, Dept Phys, I-34128 Trieste, Italy

[8] Ecole Polytech Fed Lausanne, Lab Chim Phys Mol, CH-1015 Lausanne, Switzerland

[9] European XFEL GmbH, D-22607 Hamburg, Germany

[10] Univ Roma La Sapienza, Dipartimento Chim & Tecnol Farmaco, I-00185 Rome, Italy

[11] IOM CNR TASC Lab, I-34149 Trieste, Italy

[12] Univ Trieste, Dept Chem & Pharmaceut Sci, I-34128 Trieste, Italy

来源：

PHYSICAL REVIEW LETTERS | 2014年 / 112卷 / 07期

关键词：

EXTREME-ULTRAVIOLET; CROSS-SECTIONS; HELIUM; PHOTOIONIZATION; LASER; EXCITATIONS; IONIZATION; COHERENT; ATOMS; DECAY;

D O I：

10.1103/PhysRevLett.112.073401

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The ionization dynamics of He nanodroplets irradiated with intense femtosecond extreme ultraviolet pulses of up to 10(13) W/cm(2) power density have been investigated by photoelectron spectroscopy. Helium droplets were resonantly excited to atomiclike 2p states with a photon energy of 21.4 eV, below the ionization potential (I-p), and directly into the ionization continuum with 42.8 eV photons. While electron emission following direct ionization above I-p is well explained within a model based on a sequence of direct electron emission events, the resonant excitation provides evidence of a new, collective ionization mechanism involving many excited atomiclike 2p states. With increasing power density the direct photoline due to an interatomic Coulombic decay disappears. It indicates that ionization occurs due to energy exchange between at least three excited atoms proceeding on a femtosecond time scale. In agreement with recent theoretical work the novel ionization process is very efficient and it is expected to be important for many other systems.

引用

页数：5

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