Elastic light scattering from free sub-micron particles in the soft X-ray regime

Abstract

We report the first experimental results on angle-resolved elastic light scattering in the soft X-ray regime, where free sub-micron particles in the size regime between 150 and 250 nm are studied in the gas phase by using a continuous particle beam. Two different types of studies are reported: (i) Angle-resolved elastic light scattering experiments provide specific information on the scattering patterns in the regime of element-selective inner-shell excitation near the Si 2p-edge (80-150 eV). In addition to intense forward scattering, we observe distinct features in the angle-resolved scattering patterns. These are modelled by using Mie theory as well as a model that includes contributions from diffuse and specular reflection. The results are primarily attributed to scattering from soft X-rays in the surface layer. (ii) Spectroscopic experiments are reported, where the photon detector is placed at a given scattering angle while scanning the photon energy near the Si 2p-absorption edge. These results are also analyzed by a Mie model, yielding accurate information of the size distribution.

Carrier–envelope phase-tagged imaging of the controlled electron acceleration from SiO2nanospheres in intense few-cycle laser fields

“…Figure 1(c) shows a typical TEM image of the 95 ± 6 nm spherical SiO 2 particles used in this study. A beam of nanoparticles was prepared by aerosol techniques and delivered into the interaction region by aerodynamic lens focusing [30,31] (see figure 1(a)). This method employs the generation of an aerosol by injecting a carrier gas (here N 2 ) into a lowconcentration nanoparticle suspension.…”

Core level photoionization on free sub-10-nm nanoparticles using synchrotron radiation

“…It has been applied to free clusters 7 and nanoparticles prepared in a beam. 2,8 However, the reported techniques are limited, on the one hand, to clusters prepared in wide size distribution, and on the other hand, to free nanoparticles of large diametersϾ 40 nm ͑Refs. 8 and 9͒ if synchrotron radiation is used as a radiation source.…”

Attosecond Nanophysics

“…SiO 2 nanoparticles were prepared by wet chemical techniques yielding a narrow particle size and shape distribution [35,36]. The nanoparticles were introduced into the gas phase by aerosol techniques and prepared into a focused beam by applying aerodynamic focusing [37,38]. CEP stabilized 5 fs laser pulses centered at a wavelength of 720 nm were generated as described in [39] and focused onto the nanoparticle beam.…”