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

Laforge AC, Asmussen JD, Bastian B, Bonanomi M, Callegari C, De S, Di Fraia M, Gorman L, Hartweg S, Krishnan SR, Kling MF, Mishra D, Mandal S, Ngai A, Pal N, Plekan O, Prince KC, Rosenberger P, Serrata EA, Stienkemeier F, Berrah N, Mudrich M (2022)

Publication Type: Journal article

Publication year: 2022

Journal

Physical Chemistry Chemical Physics Royal Society of Chemistry

Book Volume: 24

Pages Range: 28844-28852

Journal Issue: 47

DOI: 10.1039/d2cp03335f

Abstract

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.

Involved external institutions

University of Connecticut US United States (USA) (US) Aarhus University DK Denmark (DK) Consiglio Nazionale delle Ricerche (CNR) / National Research Council of Italy IT Italy (IT) Elettra Sincrotrone Trieste S.C.p.A. IT Italy (IT) Indian Institute of Technology Madras IN India (IN) Albert-Ludwigs-Universität Freiburg DE Germany (DE) Indian Institute of Science Education and Research (IISER) Kolkata IN India (IN) Ludwig-Maximilians-Universität (LMU) DE Germany (DE)

How to cite

APA:

Laforge, A.C., Asmussen, J.D., Bastian, B., Bonanomi, M., Callegari, C., De, S.,... Mudrich, M. (2022). Relaxation dynamics in excited helium nanodroplets probed with high resolution, time-resolved photoelectron spectroscopy. Physical Chemistry Chemical Physics, 24(47), 28844-28852. https://dx.doi.org/10.1039/d2cp03335f

MLA:

Laforge, A. C., et al. "Relaxation dynamics in excited helium nanodroplets probed with high resolution, time-resolved photoelectron spectroscopy." Physical Chemistry Chemical Physics 24.47 (2022): 28844-28852.

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