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@ARTICLE{vonHaeften:600091,
author = {von Haeften, Klaus and Laarmann, Tim and Wabnitz, Hubertus
and Moeller, Thomas},
title = {{R}elaxation dynamics of $^3${H}e and $^4${H}e clusters and
droplets studied using near infrared and visible
fluorescence excitation spectroscopy},
journal = {Physical chemistry, chemical physics},
volume = {25},
number = {3},
issn = {1463-9076},
address = {Cambridge},
publisher = {RSC Publ.},
reportid = {PUBDB-2023-07744},
pages = {1863 - 1880},
year = {2023},
note = {Waiting for fulltext},
abstract = {The relaxation dynamics of electronically excited 3He and
4He clusters and droplets is investigated using
time-correlated near-infrared and visible (NIR/VIS)
fluorescence excitation spectroscopy. A rich data set
spanning a wide range of cluster and droplet sizes is
produced. The spectral features broadly follow the vacuum
ultraviolet excitation (VUV) spectra. However, when the
NIR/VIS spectra are normalised to the VUV fluorescence,
regions with distinctly different cluster size and isotope
dependence are identified, enabling deeper insight into the
relaxation mechanism. Particle density, location of
atomic-like states and their principal quantum number, n,
are found to play an important role in the relaxation. For
states with n = 3 and higher, only energy within the surface
region is transferred to excited atoms which are
subsequently ejected from the surface and fluoresce in
vacuum. For states with n = 2, energy from the entire region
within clusters and droplets is transferred to the surface,
leading to the ejection of excited atoms and excimers. Here,
the energy is transferred by excitation hopping, which
competes with radiative and non-radiative decay, making
ejection and NIR/VIS fluorescence inefficient in
increasingly larger droplets.},
cin = {DOOR ; HAS-User / FS-PS},
ddc = {540},
cid = {I:(DE-H253)HAS-User-20120731 / I:(DE-H253)FS-PS-20131107},
pnm = {631 - Matter – Dynamics, Mechanisms and Control
(POF4-631)},
pid = {G:(DE-HGF)POF4-631},
experiment = {EXP:(DE-H253)D-I-20150101},
typ = {PUB:(DE-HGF)16},
pubmed = {36541224},
UT = {WOS:000900903400001},
doi = {10.1039/D2CP04594J},
url = {https://bib-pubdb1.desy.de/record/600091},
}