Generation of Large Vortex-Free Superfluid Helium Nanodroplets.

Superfluid helium nanodroplets are an ideal environment for the formation of metastable, self-organized dopant nanostructures. However, the presence of vortices often hinders their formation. Here, we demonstrate the generation of vortex-free helium nanodroplets and explore the size range in which they can be produced.

Tracing attosecond electron emission from a nanometric metal tip.

Solids exposed to intense electric fields release electrons through tunnelling. This fundamental quantum process lies at the heart of various applications, ranging from high brightness electron sources in d.c.

Attosecond field emission.

Field emission of electrons underlies great advances in science and technology, ranging from signal processing at ever higher frequencies to imaging of the atomic-scale structure of matter with picometre resolution. The advancing of electron microscopy techniques to enable the complete visualization of matter on the native spatial (picometre) and temporal (attosecond) scales of electron dynamics calls for techniques that can confine and examine the field emission on sub-femtosecond time intervals. Intense laser pulses have paved the way to this end by demonstrating femtosecond confinement and sub-optical cycle control of the optical field emission from nanostructured metals.

Indicators of effectiveness of nursing care in the dimension of patient safety.

Objectives: to validate nursing care effectiveness indicators of patient safety dimension.

Methods: quantitative survey, using the electronic Delphi sampli, with 52 participants selected by the Snowball sampling. Eight indicators were evaluated regarding the attributes: availability, reliability, simplicity, representativeness, sensitivity, comprehensiveness, objectivity, cost, utility, stability and timeliness.

Few-cycle laser driven reaction nanoscopy on aerosolized silica nanoparticles.

Nanoparticles offer unique properties as photocatalysts with large surface areas. Under irradiation with light, the associated near-fields can induce, enhance, and control molecular adsorbate reactions on the nanoscale. So far, however, there is no simple method available to spatially resolve the near-field induced reaction yield on the surface of nanoparticles.