Relaxation dynamics in excited helium nanodroplets probed with high resolution, time-resolved photoelectron spectroscopy,Physical Chemistry Chemical Physics

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Relaxation dynamics in excited helium nanodroplets probed with high resolution, time-resolved photoelectron spectroscopy
Physical Chemistry Chemical Physics ( IF 2.9 ) Pub Date : 2022-11-15 , DOI: 10.1039/d2cp03335f
A C LaForge ₁ , J D Asmussen ₂ , B Bastian ₂ , M Bonanomi _{3,

4} , C Callegari ₅ , S De ₆ , M Di Fraia ₅ , L Gorman ₁ , S Hartweg ₇ , S R Krishnan ₆ , M F Kling _{8,

9,

10,

11} , D Mishra ₁ , S Mandal ₁₂ , A Ngai ₇ , N Pal ₅ , O Plekan ₅ , K C Prince ₅ , P Rosenberger _{8,

9} , E Aguirre Serrata ₁ , F Stienkemeier ₇ , N Berrah ₁ , M Mudrich _{2,

6}

Affiliation

Department of Physics, University of Connecticut, Storrs, Connecticut, 06269, USA.
Department of Physics and Astronomy, Aarhus University, 8000 Aarhus C, Denmark.
Istituto di Fotonica e Nanotecnologie, Consiglio Nazionale delle Ricerche, 20133 Milano, Italy.
Dipartimento di Fisica Politecnico, 20133 Milano, Italy.
Elettra-Sincrotrone Trieste S.C.p.A., 34149 Basovizza Trieste, Italy.
Department of Physics, Indian Institute of Technology-Madras, Chennai 600036, India.
Institute of Physics, University of Freiburg, 79104 Freiburg im Breisgau, Germany.
Department of Physics, Ludwig-Maximilians-Universität Munich, 85748 Garching, Germany.
Max Planck Institute of Quantum Optics, 85748 Garching, Germany.
SLAC National Accelerator Laboratory, Menlo Park 94025, CA, USA.
Department of Applied Physics, Stanford University, Stanford 94305, CA, USA.
Indian Institute of Science Education and Research, Pune 411008, India.

Superfluid helium nanodroplets are often considered as transparent and chemically inert nanometer-sized cryo-matrices for high-resolution or time-resolved spectroscopy of embedded molecules and clusters. On the other hand, when the helium nanodroplets are resonantly excited with XUV radiation, a multitude of ultrafast processes are initiated, such as relaxation into metastable states, formation of nanoscopic bubbles or excimers, and autoionization channels generating low-energy free electrons. Here, we discuss the full spectrum of ultrafast relaxation processes observed when helium nanodroplets are electronically excited. In particular, we perform an in-depth study of the relaxation dynamics occurring in the lowest 1s2s and 1s2p droplet bands using high resolution, time-resolved photoelectron spectroscopy. The simplified excitation scheme and improved resolution allow us to identify the relaxation into metastable triplet and excimer states even when exciting below the droplets' autoionization threshold, unobserved in previous studies.

中文翻译：

用高分辨率、时间分辨光电子能谱探测激发的氦纳米液滴的弛豫动力学

超流体氦纳米液滴通常被认为是透明且化学惰性的纳米级低温基质，用于嵌入分子和簇的高分辨率或时间分辨光谱学。另一方面，当氦纳米液滴被 XUV 辐射共振激发时，会引发大量超快过程，例如弛豫到亚稳态、纳米气泡或准分子的形成以及产生低能自由电子的自电离通道。在这里，我们讨论了当氦纳米液滴被电子激发时观察到的全谱超快弛豫过程。特别是，我们使用高分辨率、时间分辨光电子能谱对最低 1s2s 和 1s2p 液滴带中发生的弛豫动力学进行了深入研究。

更新日期：2022-11-15

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