Autoionization dynamics of helium nanodroplets resonantly excited by intense XUV laser pulses

被引：14

作者：

Ovcharenko, Y. ^{[1
,2
]}

LaForge, A. C. ^{[3
]}

Langbehn, B. ^{[1
]}

Plekan, O. ^{[4
]}

Cucini, R. ^{[4
]}

Finetti, P. ^{[4
]}

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

Iablonskyi, D. ^{[6
]}

Nishiyama, T. ^{[7
]}

Ueda, K. ^{[6
]}

Piseri, P. ^{[8
,9
]}

Di Fraia, M. ^{[4
]}

Richter, R. ^{[4
]}

Coreno, M. ^{[4
,5
]}

Callegari, C. ^{[4
]}

Prince, K. C. ^{[4
,10
,11
]}

Stienkemeier, F. ^{[3
,12
]}

Moeller, T. ^{[1
]}

Mudrich, M. ^{[13
]}

机构：

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

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

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

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

[5] ISM CNR, Area Ric Roma 1, I-00015 Monterotondo, Italy

[6] Tohoku Univ, Inst Multidisciplinary Res Adv Mat, Sendai, Miyagi 9808577, Japan

[7] Kyoto Univ, Grad Sch Sci, Div Phys & Astron, Kyoto 6068501, Japan

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

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

[10] Swinburne Univ Technol, Ctr Translat Atomat, Melbourne, Vic, Australia

[11] Swinburne Univ Technol, Dept Chem & Biotechnol, Melbourne, Vic, Australia

[12] Univ Freiburg, Freiburg Inst Adv Studies FRIAS, D-79194 Freiburg, Germany

[13] Aarhus Univ, Dept Phys & Astron, DK-8000 Aarhus C, Denmark

来源：

NEW JOURNAL OF PHYSICS | 2020年 / 22卷 / 08期

关键词：

He nanodroplets; interatomic Coulombic decay; collective autoionization; nanoplasma; INTERATOMIC COULOMBIC DECAY; FREE-ELECTRON LASER; DER-WAALS CLUSTERS; IONIZATION; LUMINESCENCE; MOLECULES; COHERENT; IMPACT; ATOMS;

D O I：

10.1088/1367-2630/ab9554

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The ionization dynamics of helium droplets irradiated by intense, femtosecond extreme ultraviolet (XUV) pulses is investigated in detail by photoelectron spectroscopy. Helium droplets are resonantly excited to atomic-like 2p states with a photon energy of 21.5 eV and autoionize by interatomic Coulombic decay (ICD). A complex evolution of the electron spectra as a function of droplet size (250 to 10(6)He atoms per droplet) and XUV intensity (10(9)-10(12)W cm(-2)) is observed, ranging from narrow atomic-like peaks that are due to binary autoionization, to an unstructured feature characteristic of electron emission from a nanoplasma. The experimental results are analyzed and interpreted with the help of a numerical simulation based on rate equations taking into account all relevant processes-multi-step ionization, electronic relaxation, ICD, secondary inelastic collisions, desorption of electronically excited atoms, and collective autoionization (CAI).

引用

页数：18

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