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Study of Characterization of Micron-Size Hydrogen Clusters Using Mie Scattering (CAT#: STEM-ST-0078-YJL)

Introduction

Because of the recent progress in intense laser technology, the advanced PW class lasers can now achieve intense laser fields around 1022 W/cm2; with such fields, all the electrons inside the micron-size hydrogen cluster up to 3.0 µm in diameter can be fully stripped off, resulting in a pure Coulomb explosion with a pronounced increase in accelerated maximum proton energies scaled as Emax = 276(d/2)2, where d is a diameter of clusters. For example, 100 MeV protons could be produced via the Coulomb explosion of the 1.2 µm diameter hydrogen cluster when irradiated by a laser pulse with a peak intensity of 1.6 × 1021 W/cm2. The robust nature of the Coulomb explosion mechanism offer an additional advantage for practical applications. Therefore, production of micron-size hydrogen cluster with sizes of a few µm range has been a critical issue to generate pure proton beams exceeding 100 MeV.




Principle

Mie scattering is defined as the type of scattering in which the diameter of the particle is the same or more than the wavelength of the radiation. Mie scattering gives a generalized solution for a system where a scattering of light takes place by a homogenous spherical medium. And this medium should have a refractive index different from that of the medium through which the light is traversing.
Unlike Rayleigh scattering, Mie scattering is not a physically independent phenomenon rather, it is a solution to Maxwell's equations for situations where the phase of the incident angle can change within the dimension of the scattering particles. Mie scattering is more commonly known as Mie solution, and it is named after Gustav Mie, a German physicist.
Mie scattering is also known as aerosol particle scattering, takes place in the atmosphere below 1,500 feet. In Mie scattering, the diameter of the spherical particles through which the light is scattered is approximately equal to the wavelength.

Applications

Mie scattering occurs in a variety of applications, including atmospheric science, cancer detection and treatment, metamaterials, and parasitology. Another application is the characterization of particles by optical scattering measurements.

Procedure

1. Sample preparation
2. Measurement by scattering detection instrument
3. Data analysis

Materials

Mie scattering measurement system
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