Structure determination of alkali trimers on helium nanodroplets through laser-induced Coulomb explosion

Lorenz Kranabetter, Henrik H Kristensen, Constant A Schouder, Henrik Stapelfeldt*

*Corresponding author for this work

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaperJournal articleResearchpeer-review

Abstract

Alkali trimers, Ak 3, located on the surface of He nanodroplets are triply ionized following multiphoton absorption from an intense femtosecond laser pulse, leading to fragmentation into three correlated Ak + ions. Combining the information from threefold covariance analysis of the emission direction of the fragment ions and their kinetic energy distributions P(E kin), we find that Na 3, K 3, and Rb 3 have an equilateral triangular structure, corresponding to that of the lowest lying quartet state A 2 ′ 4 , and determine the equilibrium bond distance R eq(Na 3) = 4.65 ± 0.15 Å, R eq(K 3) = 5.03 ± 0.18 Å, and R eq(Rb 3) = 5.45 ± 0.22 Å. For K 3 and Rb 3, these values agree well with existing theoretical calculations, while for Na 3, the value is 0.2-0.3 Å larger than the existing theoretical results. The discrepancy is ascribed to a minor internuclear motion of Na 3 during the ionization process. In addition, we determine the distribution of internuclear distances P(R) under the assumption of fixed bond angles.

Original languageEnglish
Article number131101
JournalThe Journal of Chemical Physics
Volume160
Issue13
Number of pages7
ISSN0021-9606
DOIs
Publication statusPublished - Apr 2024

Fingerprint

Dive into the research topics of 'Structure determination of alkali trimers on helium nanodroplets through laser-induced Coulomb explosion'. Together they form a unique fingerprint.

Cite this