One- and two-photon spectroscopy of highly excited states of alkali-metal atoms on helium nanodroplets

Pifrader, Alexandra; Allard, Olivier; Auböck, Gerald; Callegari, Carlo; Ernst, Wolfgang; Huber, Robert; Ancilotto, Francesco

doi:10.1063/1.3500397

Cited by 31 publications

(38 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We have also calculated the Rb 5sΣ → DFT calculation thus overestimates the atomic shift, being unclear which part of the disagreement has to be attributed to deficiencies of the model and which to inaccuracies of the excited Ak-He pair potentials we are using. 54 Note that a broad Rb + ion signal level which features a step around 20 700 cm −1 is measured around the 6sΣ feature, as previously observed in photoion 33 and laser-induced fluorescence spectra 59 around the 6pΠ transition. This contribution may be due to photoionization of Rb 2 dimers which fragment into Rb + .…”

Section: Photoionssupporting

confidence: 75%

Desorption Dynamics of Heavy Alkali Metal Atoms (Rb, Cs) Off the Surface of Helium Nanodroplets

et al. 2014

View full text Add to dashboard Cite

We present a combined ion imaging and density functional theory study of the dynamics of the desorption process of rubidium and cesium atoms off the surface of helium nanodroplets upon excitation of the perturbed 6s and 7s states, respectively. Both experimental and theoretical results are well represented by the pseudodiatomic model for effective masses of the helium droplet in the desorption reaction of meff/mHe ≈ 10 (Rb) and 13 (Cs). Deviations from this model are found for Rb excited to the 6p state. Photoelectron spectra indicate that the dopant-droplet interaction induces relaxation into low-lying electronic states of the desorbed atoms in the course of the ejection process.

show abstract

Section: Photoionssupporting

confidence: 75%

Desorption Dynamics of Heavy Alkali Metal Atoms (Rb, Cs) Off the Surface of Helium Nanodroplets

et al. 2014

View full text Add to dashboard Cite

show abstract

“…In the following we adhere to the Hund's case (a) notation, as discussed, e.g., in Ref. 65. In this scheme the electronic states are labeled as 2S+1 Λ Ω , S being the spin of the system, Λ being the projection of the orbital angular momentum onto the axis, defined by the cation and the COM of the helium droplet, and Ω being the projection of the total electronic angular momentum onto this axis.…”

Section: Time-dependent Dftmentioning

confidence: 99%

Dynamics of photoexcited Ba+ cations in 4He nanodroplets

Leal

Zhang

Barranco

et al. 2016

The Journal of Chemical Physics

View full text Add to dashboard Cite

We present a joint experimental and theoretical study on the desolvation of Ba(+) cations in (4)He nanodroplets excited via the 6p ← 6s transition. The experiments reveal an efficient desolvation process yielding mainly bare Ba(+) cations and Ba(+)Hen exciplexes with n = 1 and 2. The speed distributions of the ions are well described by Maxwell-Boltzmann distributions with temperatures ranging from 60 to 178 K depending on the excitation frequency and Ba(+) Hen exciplex size. These results have been analyzed by calculations based on a time-dependent density functional description for the helium droplet combined with classical dynamics for the Ba(+). In agreement with experiment, the calculations reveal the dynamical formation of exciplexes following excitation of the Ba(+) cation. In contrast to experimental observation, the calculations do not reveal desolvation of excited Ba(+) cations or exciplexes, even when relaxation pathways to lower lying states are included.

show abstract

“…For alkali-doped helium droplets it was found that the frequency shift and linewidth of the resonances increase initially with increasing principle quantum number n. 11,13 For values of n where the mean electron orbit radius becomes larger than the droplet diameter, a redshift and narrowing of the resonances is observed. 10,11 For the droplet sizes considered in this study, the transition is expected to occur for states of Ba with n ∼ 11.…”

Section: Rydberg States 1 Excitation Spectramentioning

confidence: 99%

Spectroscopy and dynamics of barium-doped helium nanodroplets

Loginov

Drabbels

2012

The Journal of Chemical Physics

View full text Add to dashboard Cite

Excitation spectra up to the ionization threshold are reported for barium atoms located on the surface of helium nanodroplets. For states with low principal quantum number, the resonances are substantially broadened and shifted towards higher energy with respect to the gas phase. This has been attributed to the repulsive interaction of the excited atom with the helium at the Franck-Condon region. In contrast, for states with high principal quantum number the resonances are narrower and shifted towards lower energies. Photoelectron and ZEKE spectroscopy reveal that the redshift results from a lowering of the ionization threshold due to polarization of the helium by the barium ionic core. As a result of the repulsive interaction with the helium, excited barium atoms desorb from the surface of the droplets. Only when excited to the 6s6p 1 P 1 state, which reveals an attractive interaction with the helium, the atoms remain attached to the droplets.

show abstract

One- and two-photon spectroscopy of highly excited states of alkali-metal atoms on helium nanodroplets

Cited by 31 publications

References 30 publications

Desorption Dynamics of Heavy Alkali Metal Atoms (Rb, Cs) Off the Surface of Helium Nanodroplets

Desorption Dynamics of Heavy Alkali Metal Atoms (Rb, Cs) Off the Surface of Helium Nanodroplets

Dynamics of photoexcited Ba+ cations in 4He nanodroplets

Spectroscopy and dynamics of barium-doped helium nanodroplets

Contact Info

Product

Resources

About