Papers › Femtosecond-and-atom-resolved solvation dynamics of a Na^+ ion in a helium nanodroplet
Femtosecond-and-atom-resolved solvation dynamics of a Na^+ ion in a helium nanodroplet
Simon H. Albrechtsen, Jeppe K. Christensen, Christian E. Petersen, Constant A. Schouder, Pedro Javier Carchi-Villalta, Iker Sánchez-Pérez, Massimiliano Bartolomei, Tomás González-Lezana, Fernando Pirani, Henrik Stapelfeldt
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Recently, it was shown how the primary steps of solvation of a single Na^+ ion, instantly created at the surface of a nanometer-sized droplet of liquid helium, can be followed at the atomic level [Albrectsen et al. Nature 623, 319 (2023)]. This involved measuring, with femtosecond time resolution, the gradual attachment of individual He atoms to the Na^+ ion as well as the energy dissipated from the local region of the ion. In the current work, we provide a more comprehensive and detailed description of the experimental findings of the solvation dynamics, and present an improved Poisson-statistical analysis of the time-resovled yields of the solvation complexes, Na^+Heₙ. For droplets containing an average of 5200 He atoms, this analysis gives a binding rate of 1.84±0.09 atoms/ps for the binding of the first five He atoms to the Na^+ ion. Also, thanks to accurate heoretical values for the evaporation energies of the Na^+Heₙ complexes, obtained by Path Integral Monte Carlo methos using a new potential energy surface presented here for the first time, we improved the determination of the time-dependent removal of the solvation energy from the region around the sodium ion. We find that it follows Newton's law of cooling for the first 6 ps. Measurements were carried out for three different average droplet sizes, ⟨N_D⟩= 9000, 5200 and 3600 helium atoms, and differences between these results are discussed.
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