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<p>Superfluid He nanodroplets resonantly excited by extreme ultraviolet (XUV) pulses can relax via interatomic coulombic decay (ICD), generally considered an ultrafast process. Here, we introduce a novel approach to probe the dynamics of ICD in He nanodroplets over timescales ranging from femtoseconds to nanoseconds. Our method relies on detecting XUV fluorescence emitted from the nanodroplets as they are driven into a nanoplasma by subsequent intense infrared pulses. Nanoplasma ignition is facilitated by tunnel ionization of XUV-excited He<InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(^*\)</EquationSource> </InlineEquation> atoms attached to the droplets; it thus serves as a sensitive probe of their relaxation dynamics. The observed nanosecond-scale decay is attributed to ICD between pairs of He<InlineEquation ID="IEq2"> <EquationSource Format="TEX">\(^*\)</EquationSource> </InlineEquation> atoms undergoing roaming motion on the droplet surface, as supported by quantum-mechanical and classical model calculations.</p>

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XUV fluorescence as a probe of interatomic coulombic decay of resonantly excited He nanodroplets

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年1月9日

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  • Keshav Sishodia,
  • Ltaief Ben Ltaief,
  • Niklas Scheel,
  • István B. Földes,
  • Andreas Hult Roos,
  • Martin Albrecht,
  • Matyáš Staněk,
  • Lucie Jurkovičová,
  • Ondrej Hort,
  • Jaroslav Nejdl,
  • Ernesto García-Alfonso,
  • Nadine Halberstadt,
  • Jakob Andreasson,
  • Eva Klimešová,
  • Maria Krikunova,
  • Sivarama Krishnan,
  • Andreas Heidenreich,
  • Marcel Mudrich

摘要

Superfluid He nanodroplets resonantly excited by extreme ultraviolet (XUV) pulses can relax via interatomic coulombic decay (ICD), generally considered an ultrafast process. Here, we introduce a novel approach to probe the dynamics of ICD in He nanodroplets over timescales ranging from femtoseconds to nanoseconds. Our method relies on detecting XUV fluorescence emitted from the nanodroplets as they are driven into a nanoplasma by subsequent intense infrared pulses. Nanoplasma ignition is facilitated by tunnel ionization of XUV-excited He \(^*\) atoms attached to the droplets; it thus serves as a sensitive probe of their relaxation dynamics. The observed nanosecond-scale decay is attributed to ICD between pairs of He \(^*\) atoms undergoing roaming motion on the droplet surface, as supported by quantum-mechanical and classical model calculations.