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Kim, C.; Yurgenson, S. V.; Hu, Chih-Ching; Northby, J. A.

doi:10.1023/a:1022581123318

Cited by 12 publications

(5 citation statements)

References 12 publications

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“…34,35,[107][108][109][110][111][112][113][114] The repulsive nature of the interaction of these species with the liquid helium results in a very similar behavior to that observed for alkali atoms or dimers. Photoionization of pure and doped helium droplets have been studied in Ref.…”

Section: Intrinsic He Impuritiesmentioning

confidence: 53%

“…Onaxis or off-axis surface ionization detectors, well known for their high quantum efficiency, have been successfully used for the spectroscopy of alkali atoms 37 and He 2 * molecules. 34,35 Upon excitation these species detach from the droplet thus giving rise to a decrease of the ion current for an on-axis configuration. Upon irradiation with less than 100 mW of laser power, a depletion of up to 50% can easily be achieved with Na atoms attached to He droplets.…”

Section: Experimental Aspectsmentioning

confidence: 99%

“…transitions in the ranges of 0.8 -1.1 and 1.9-2.2 m, respectively 34,35. Time-of-flight measurements revealed a bimodal kinetic energy distribution of the laser detached He 2 * excimers 34.…”

mentioning

confidence: 94%

“…Time-of-flight measurements revealed a bimodal kinetic energy distribution of the laser detached He 2 * excimers 34. A fast component ͑energy of about 1000 cm Ϫ1 ͒ is ascribed to direct desorption, whereas the molecules of the slow component ͑having kinetic energy of about 5 cm Ϫ1 ͒ appear to relax extensively before ejection.been studied via high resolution diode laser detachment spectroscopy, revealing rich rotational structure of the transition 35.…”

mentioning

confidence: 99%

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Electronic spectroscopy in He droplets

Stienkemeier

Vilesov

2001

The Journal of Chemical Physics

228

288

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Articles you may be interested inThe structure of mixed 3He-4He droplets doped with OCS: A density functional approachThe ethyl radical in superfluid helium nanodroplets: Rovibrational spectroscopy and ab initio computationsThe vibrational and rotational dynamics of acetylene solvated in superfluid helium nanodroplets Recent experiments on the electronic spectroscopy of atoms, clusters, and organic molecules embedded in helium nanodroplets are reviewed. Electronic transitions imply a larger degree of distortion of the helium environment as compared to vibrational and rotational excitations. Thus new phenomena arise such as the appearance of side bands in the spectra, which are due to the excitation of helium collective vibrations, large changes of the effective molecular rotational constants and even the expulsion of an atom ͑or molecule͒ from the cluster upon excitation. These features make it possible to probe the helium environment and its interactions with molecular chromophores on the atomic scale. Real-time studies of the manifestations of superfluidity and of chemical processes in the droplets via femtosecond excitation techniques, provide a new perspective to this field. The considerable amount of data available so far shows the large potential of helium droplets for isolation and spectroscopy of large molecules and clusters. The low temperature and the high spectral resolution achievable because of the relative homogeneity of this medium, are instrumental for separating solvation effects that are obscured by the presence of much larger fluctuations in more classical environments. Hence, electronic and geometrical structures of even large entities become accessible.

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Section: Intrinsic He Impuritiesmentioning

confidence: 53%

Section: Experimental Aspectsmentioning

confidence: 99%

mentioning

confidence: 94%

mentioning

confidence: 99%

See 2 more Smart Citations

Electronic spectroscopy in He droplets

Stienkemeier

Vilesov

2001

The Journal of Chemical Physics

228

288

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“…These experiments also showed that the rotational distribution of these molecules was anomalous, with mostly only high rotational states populated. The mechanism which allows us to perform spectroscopic studies of this extremely dilute species has been elucidated in a recent paper [19]. We find that molecules in the lowest triplet electronic state reside on the surface of the droplets, and that the result of a photo induced electronic transition is to detach them.…”

Section: Introductionmentioning

confidence: 76%

Detachment of metastable helium molecules from helium nanodroplets

Yurgenson

Kim

et al. 1999

The European Physical Journal D

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Metastable helium a 3 Σ + u molecules are produced in helium nanodroplets by electron bombardment, and become attached to their surface. Photo induced electronic transitions release them, and they are subsequently detected when they eject secondary electrons upon reaching a nearby surface. We report here the first high resolution spectroscopic study of this system. It reveals a highly non-thermal rotational state distribution with N = 1 and 11 ≤ N ≤29 populated but with the intermediate N states missing. Further studies of the bombarding electron energy appearance threshold for the high rotational states suggest that their precursor is the atomic 2 3 P state.PACS. 36.40.Vz Optical properties of clusters -67.40.Yv Helium impurities and other defects

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