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7 Sep 2009

Volume 95, Issue 10, Articles (10xxxx)

Issue Cover Spotlight Figure

Appl. Phys. Lett. 95, 083506 (2009); http://dx.doi.org/10.1063/1.3216851 (3 pages)

J. Z. Sun, M. C. Gaidis, E. J. O’Sullivan, E. A. Joseph, G. Hu, D. W. Abraham, J. J. Nowak, P. L. Trouilloud, Yu Lu, S. L. Brown, D. C. Worledge, and W. J. Gallagher

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Ion implantation and energy loss effect during high-voltage pulsed glow discharge in a tube

Langping Wang, Yang Lu, Xiaofeng Wang, Zhiwen Xie, Lei Huang, and Yanhong Wei

Appl. Phys. Lett. 95, 101501 (2009); http://dx.doi.org/10.1063/1.3225155 (3 pages)

Online Publication Date: 9 September 2009

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Plasma parameters of high-voltage pulsed glow discharge in a tube were studied using a static probe and optical emission spectrometry. Experiment results show that two kinds of plasma can be obtained in the tube and a virtual anode can be formed at the center of the tube. The potential of the virtual anode is about 20%–30% of the applied bias. The Auger electron spectroscopy depth profile shows that the peak depth of the implanted ions in the tube is about 70%–80% of that outside the tube, owing to the virtual anode.
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52.25.Os Emission, absorption, and scattering of electromagnetic radiation
52.25.Tx Emission, absorption, and scattering of particles
52.50.-b Plasma production and heating
52.70.Ds Electric and magnetic measurements
52.77.Dq Plasma-based ion implantation and deposition
52.80.Hc Glow; corona

Photoelectric charging of dust particles: Effect of spontaneous and light induced field emission of electrons

M. S. Sodha and A. Dixit

Appl. Phys. Lett. 95, 101502 (2009); http://dx.doi.org/10.1063/1.3223618 (3 pages) | Cited 1 time

Online Publication Date: 10 September 2009

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The authors have analyzed the charging of dust particles in a plasma, taking into account the electron/ion currents to the particles, electron/ion generation and recombination, electric field emission, photoelectric emission and photoelectric field emission of electrons under the influence of light irradiation; the irradiance has been assumed to be at a level, which lets the particles retain the negative sign of the charge. Numerical results and discussion conclude the papers.
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52.27.Lw Dusty or complex plasmas; plasma crystals
52.25.Tx Emission, absorption, and scattering of particles
52.40.Db Electromagnetic (nonlaser) radiation interactions with plasma
52.20.Fs Electron collisions
52.20.Hv Atomic, molecular, ion, and heavy-particle collisions

MeV proton beams generated by 3 mJ ultrafast laser pulses at 0.5 kHz

Bixue Hou, John Nees, James Easter, Jack Davis, George Petrov, Alexander Thomas, and Karl Krushelnick

Appl. Phys. Lett. 95, 101503 (2009); http://dx.doi.org/10.1063/1.3224180 (3 pages) | Cited 4 times

Online Publication Date: 10 September 2009

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Well-collimated proton beams are generated from bulk glass along the target normal direction by tightly focused 55 fs, 3 mJ pulses from a laser operating at 0.5 kHz repetition rate. Proton beams with energies of >265 keV have an emission angle of about 16° full width at half maximum. Spectral measurements indicate proton energies exceeding 0.5 MeV with a flux of 3.2×109 s−1 sr−1 and the flux of measured protons with energies of greater than 90 keV is 8.5×1011 s−1 sr−1 on center.
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42.65.Re Ultrafast processes; optical pulse generation and pulse compression
41.75.Ak Positive-ion beams

Properties of electron swarms in CF3I

H. Hasegawa, H. Date, M. Shimozuma, and H. Itoh

Appl. Phys. Lett. 95, 101504 (2009); http://dx.doi.org/10.1063/1.3224197 (3 pages)

Online Publication Date: 11 September 2009

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We report the electron swarm parameters, the drift velocity, and the ionization coefficients in CF3I gas for relatively wide ranges of reduced electric fields (E/N). The drift velocity is measured based on the arrival-time spectra of electrons for E/N = 200–3000 Td, and the first and second ionization coefficients are determined by the steady-state Townsend method for E/N = 400–5000 Td. The results are compared with those of CF4 to show that CF3I has a high reactivity for electron attachment in a low E/N region resulting in a much higher limiting E/N value (440 Td) than that of CF4.
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51.50.+v Electrical properties (ionization, breakdown, electron and ion mobility, etc.)
52.80.Dy Low-field and Townsend discharges
51.10.+y Kinetic and transport theory of gases
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