Vibrational spectroscopy of sulfur hexafluoride attached to helium clusters

Goyal, Sandeep K.; Schutt, D. L.; Scoles, G.

doi:10.1103/physrevlett.69.933

Cited by 308 publications

(234 citation statements)

References 16 publications

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“…25,39 We proposed that this feature arises from electrons that drop below the conduction band edge and thus become localized in electron bubble states. The formation of bubble states in bulk liquid He is well-established, 15,43,44,46,72 where they have a radius of ∼17 Å with an effective mass of 243 4 He, and there is considerable experimental and theoretical support for their existence in He droplets. 14,52,[73][74][75] If the bubble migrates to the droplet surface, the electron can escape by tunneling over a low barrier, calculated to be only 3 meV at the surface of bulk liquid He.…”

Section: A Origins Of Features a And B: Penning Ionizationmentioning

confidence: 99%

Photoelectron Imaging of Helium Droplets Doped with Xe and Kr Atoms

et al. 2008

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Helium droplets doped with Xe and Kr atoms were photoionized by using VUV synchrotron radiation from the Advanced Light Source and the resulting photoelectron images were measured. A wide range of He droplet sizes, photon energies, and dopant pick-up conditions was investigated. Significant ionization of dopants was observed at 21.6 eV, the absorption maximum of 2p 1 P 1 electronic excited state of He droplets, indicating an indirect ionization mechanism via excitation transfer. The photoelectron images and spectra reveal multiple photoionization mechanisms and pathways for the photoelectrons to escape the droplet. Specifically, they show sets of sharp peaks assigned to two mechanisms for Penning ionization of the dopant by He* in which the photoelectrons leave the droplet with no detectable energy loss, a broad, intense feature representing electrons that undergo significant energy loss, and a small amount of ultraslow electrons that may result from electron trapping at the droplet surface. The droplet-size dependence of the broad, intense feature suggests the development of the conduction band edge in the largest droplets seen here (〈N〉 ≈ 250,000).

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Section: A Origins Of Features a And B: Penning Ionizationmentioning

confidence: 99%

Photoelectron Imaging of Helium Droplets Doped with Xe and Kr Atoms

et al. 2008

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“…10 Alternatively, a bolometer can be used to measure the energy content of the droplet beam, which is directly related to the droplet size. 11 Both these spectroscopic techniques are commonly referred to as beam depletion spectroscopy.…”

Section: Introductionmentioning

confidence: 99%

A new sensitive detection scheme for helium nanodroplet isolation spectroscopy: application to benzene

Loginov

Braun

Drabbels

2008

Phys. Chem. Chem. Phys.

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A new method is presented for recording excitation spectra of molecules embedded in helium nanodroplets. The method relies on the complete evaporation of the droplets following excitation of a dissolved molecule and the subsequent detection of the remaining unsolvated molecule by mass spectrometry. The technique has been successfully applied to record the S 1 1 B 2u ' S 0 1 A 1g transition in benzene. The transition frequencies determined by this new method, beam depletion spectroscopy and REMPI spectroscopy have been found to differ slightly from each other. It is argued that these differences in transition frequency are related to the different droplet sizes probed by the spectroscopic techniques.

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“…The latter eventually exchange their energy with atoms at the surface, letting them to evaporate through a quantum evaporation process. Thus, by monitoring the droplet beam with a mass spectrometer, one detects the spectroscopic transitions of the impurity which, in turn, contain information about the droplet itself [50]. This process has some interesting analogies with the quantum evaporation experiments in bulk helium [51], where the initial bunch of excitations (phonons and/or rotons) is produced by a heater immersed in the liquid, while the evaporated atoms are collected at a bolometer above the surface.…”

Section: Excitationsmentioning

confidence: 99%

Helium nanodroplets and trapped Bose–Einstein condensates as prototypes of finite quantum fluids

Dalfovo

Stringari

2001

The Journal of Chemical Physics

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Helium nanodroplets and trapped Bose-Einstein condensates in dilute atomic gases offer complementary views of fundamental aspects of quantum many-body systems. We discuss analogies and differences, stressing their common theoretical background and peculiar features. We briefly review some relevant concepts, such as the meaning of superfluidity in finite systems, the behavior of elementary excitations and collective modes, as well as rotational properties and quantized vorticity.

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Vibrational spectroscopy of sulfur hexafluoride attached to helium clusters

Cited by 308 publications

References 16 publications

Photoelectron Imaging of Helium Droplets Doped with Xe and Kr Atoms

Photoelectron Imaging of Helium Droplets Doped with Xe and Kr Atoms

A new sensitive detection scheme for helium nanodroplet isolation spectroscopy: application to benzene

Helium nanodroplets and trapped Bose–Einstein condensates as prototypes of finite quantum fluids

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