Results 251 to 260 of about 4,663,474 (304)

Particle Beam Sources

2015
In this section we consider the fate of energetic ions (1–100 keV) incident on a solid surface. The 10 ways in which ions can interact with a surface are illustrated in Fig. 8.1. An incoming ion can be backscattered by an atom or group of atoms in the bombarded sample (1).
openaire   +1 more source

Gas source molecular beam epitaxy

Conference on Lasers and Electro-Optics, 1985
The replacement of the elemental sources of conventional MBE with simple compounds, first reported in 1980 [1], was initiated in order to bring the advantages of molecular beam epitaxy to the growth of GaxIn1−xAs1−yPy/InP heterostructures. These advantages center about precision in layer thickness and abruptness in doping and heterojunction interfaces.
M B Panish, H Temkin
openaire   +1 more source

Cone Beam Reconstruction with Sources on a Curve

SIAM Journal on Applied Mathematics, 1985
An inversion procedure is developed for reconstructing a function of compact support in $\mathbb{R}^3 $ from its divergent beam x-ray transform with sources on a curve. The results apply to many curves not satisfying the conditions of Tuy [SIAM J. Appl. Math., 43 (1983), pp. 546–552), for example, planar circles of sufficiently large radius.
openaire   +1 more source

Virtual source for a Hermite–Gauss beam

Optics Letters, 2003
A virtual source that generates a Hermite-Gauss wave of mode numbers m and n is introduced. An expression is obtained for this Hermite-Gauss wave. From this expression, the paraxial approximation and the first 3 orders of nonparaxial corrections for the corresponding paraxial Hermite-Gauss beam are determined.
openaire   +2 more sources

Virtual source for the Bessel–Gauss beam

Optics Letters, 2002
The virtual source for generation of the fundamental scalar Bessel-Gauss wave is identified. An expression is derived for the Bessel-Gauss wave, which, in the appropriate limit, yields the paraxial approximation for the fundamental Bessel-Gauss beam. For the azimuthally symmetric beam, the first-order nonparaxial correction to the on-axis field is also
openaire   +2 more sources

Principle of an Ion Source for Intense Beams

Nature, 1950
THE performance of ion sources, associated with accelerating tubes, is limited by space-charge phenomena, particularly troublesome in the vicinity of the extraction aperture. It is therefore desirable to avoid space-charge accumulation along the whole path of the ions. This can be obtained by changing the configuration of the extraction field.
openaire   +2 more sources

Virtual source for a Laguerre–Gauss beam

Optics Letters, 2002
A virtual source that generates a cylindrically symmetric Laguerre-Gauss wave of radial mode number n is introduced. An expression is derived for this Laguerre-Gauss wave that in the appropriate limit yields the corresponding Laguerre-Gauss beam.
openaire   +2 more sources

The Spectroscopic Properties of the Ionic Beam Source

Applied Optics, 1967
A relatively new spectroscopic source, consisting of a beam of high velocity, unidirectional and monoenergetic atoms and ions that have been electronically excited by a thin foil, is described. Special attention is directed toward the properties of spectroscopic interest; some of these properties include particle densities, source purity, operating ...
openaire   +2 more sources

The Use of Neutron Beam Therapy in the Management of Locally Advanced Nonresectable Radioresistant Tumors

Ca-A Cancer Journal for Clinicians, 1988
Frank R Hendrickson, F R Hendrickson
exaly  

External Beam Radiation Therapy for Prostate Cancer

Ca-A Cancer Journal for Clinicians, 2000
Eric M Horwitz, G E Hanks, Gerald E Hanks   +2 more
exaly