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3 Apr 2006

Volume 88, Issue 14, Articles (14xxxx)

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Appl. Phys. Lett. 88, 143508 (2006); http://dx.doi.org/10.1063/1.2191448 (3 pages)

R. Chan, M. Feng, N. Holonyak, A. James, and G. Walter
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Optimization of laser parameters for the maximum efficiency in the generation of water-window radiation using a liquid nitrogen jet

B. Kim, B. Ahn, D. Lee, J. Kim, and D. Kim

Appl. Phys. Lett. 88, 141501 (2006); http://dx.doi.org/10.1063/1.2192088 (3 pages) | Cited 3 times

Online Publication Date: 4 April 2006

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A laser-produced plasma is a suitable compact x-ray source that can be of broad band or quasimonochromatic with a proper choice of material and filter. To address the maximum conversion efficiency for an efficient, quasimonochromatic source at 2.88 nm (N VI 1s2‐1s2p transition) using liquid nitrogen jet for soft x-ray microscopy, the radiation characteristics such as absolute intensity, spectra, and angular distribution have been investigated for different laser pulse durations (picosecond and femtosecond pulses) and laser energies The comparison of conversion efficiencies between picosecond [120 ps full width at half maximum (FWHM)] and femtosecond (40–500 fs FWHM) lasers indicates that the picosecond laser would provide better conversion efficiency, which is 1.6% at 2×1013 W/cm2. The investigation shows that the laser intensity for the maximum conversion efficiency scales as Im∝1/τα, where α = 0.9±0.15. This empirical formula is useful to choose the laser parameters properly for a given pulse width.
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52.38.Ph X-ray, γ-ray, and particle generation
52.25.Os Emission, absorption, and scattering of electromagnetic radiation
52.70.La X-ray and γ-ray measurements

External magnetic field influence on Hα line in abnormal glow discharge

B. M. Obradović, I. P. Dojčinović, M. M. Kuraica, and J. Purić

Appl. Phys. Lett. 88, 141502 (2006); http://dx.doi.org/10.1063/1.2193052 (3 pages) | Cited 3 times

Online Publication Date: 5 April 2006

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Influence of the external axial magnetic field on the hydrogen Hα line profiles in an abnormal glow discharge has been studied. It has been found that the applied magnetic field predominantly increases the intensity of central component of the characteristic excessively broadened Hα profile. Magnetic filed causes helical motion of electrons along the electric field lines and prolongs their trajectories increasing the number of collisions with matrix gas. This explains the increase of the central component of Hα profile and can be regarded as an experimental proof for the main contribution of electron excitation to that part of the profile.
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52.30.Cv Magnetohydrodynamics (including electron magnetohydrodynamics)
52.80.Hc Glow; corona
52.70.Kz Optical (ultraviolet, visible, infrared) measurements
52.25.Fi Transport properties
52.20.Fs Electron collisions
52.20.Hv Atomic, molecular, ion, and heavy-particle collisions

Controlled particle generation in an inductively coupled plasma

M. Schulze, A. von Keudell, and P. Awakowicz

Appl. Phys. Lett. 88, 141503 (2006); http://dx.doi.org/10.1063/1.2193041 (3 pages) | Cited 7 times

Online Publication Date: 6 April 2006

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By injecting pulses of acetylene into an inductive argon/helium discharge, carbon clusters with diameters in the range of 10–50 nm are produced. These particles cause an instability of the plasma, which becomes visible as an oscillation of the emission intensity. The particles are analyzed ex situ using atomic force microscopy and scanning electron micrographs. A unique linear dependence between particle size and oscillation time period is found. Thereby the oscillation phenomenon can serve as monitor signal to control the size of plasma produced particles.
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52.50.Dg Plasma sources
52.80.-s Electric discharges
52.77.Dq Plasma-based ion implantation and deposition
52.35.Qz Microinstabilities (ion-acoustic, two-stream, loss-cone, beam-plasma, drift, ion- or electron-cyclotron, etc.)
52.35.Fp Electrostatic waves and oscillations (e.g., ion-acoustic waves)
52.25.Tx Emission, absorption, and scattering of particles
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