APL Nameplate
  • Volume/Page
  • Keyword
  • DOI
  • Citation
  • Advanced
   
 
 
 

Flickr Twitter iResearch App Facebook

BROWSE VOLUMES

Year Range: 
Search Issue | RSS Feeds RSS
Previous Issue Next Issue

25 Feb 2008

Volume 92, Issue 8, Articles (08xxxx)

Issue Cover Spotlight Figure

Appl. Phys. Lett. 92, 081101 (2008); http://dx.doi.org/10.1063/1.2883874 (3 pages)

Marcel W. Pruessner, Todd H. Stievater, and William S. Rabinovich
Enlarge Image | Read More
Return to All Sections
back to top
RSS Feeds

Laser-induced breakdown spectroscopy in reactive flows of hydrocarbon-air mixtures

Amalia Michalakou, Polychronis Stavropoulos, and Stelios Couris

Appl. Phys. Lett. 92, 081501 (2008); http://dx.doi.org/10.1063/1.2839378 (3 pages) | Cited 7 times

Online Publication Date: 25 February 2008

Full Text: Read Online (HTML) | Download PDF

Show Abstract
Laser-induced breakdown spectroscopy is used for the determination of the local equivalence ratio (i.e., the ratio of the actual fuel-to-oxidizer mass over the ratio of the fuel-to-oxidizer mass at stoichiometry) in different methane-, ethylene-, and propane-air mixtures. In particular, it is shown that the ratio of the intensities of the atomic spectral lines of H, C, and O, emitted from a laser-induced spark in the gaseous mixture, can be used for the rapid and accurate determination of the local equivalence ratio.
Show PACS
47.70.-n Reactive and radiative flows
51.70.+f Optical and dielectric properties

An 11 cm long atmospheric pressure cold plasma plume for applications of plasma medicine

XinPei Lu, ZhongHe Jiang, Qing Xiong, ZhiYuan Tang, XiWei Hu, and Yuan Pan

Appl. Phys. Lett. 92, 081502 (2008); http://dx.doi.org/10.1063/1.2883945 (2 pages) | Cited 50 times

Online Publication Date: 26 February 2008

Full Text: Read Online (HTML) | Download PDF

Show Abstract
In this letter, a room temperature atmospheric pressure plasma jet device is reported. The high voltage electrode of the device is covered by a quartz tube with one end closed. The device, which is driven by a kilohertz ac power supply, is capable of generating a plasma plume up to 11 cm long in the surrounding room air. The rotational and vibrational temperatures of the plasma plume are 300 and 2300 K, respectively. A simple electrical model shows that, when the plasma plume is contacted with a human, the voltage drop on the human is less than 66 V for applied voltage of 5 kV (rms).
Show PACS
87.80.-y Biophysical techniques (research methods)
52.77.-j Plasma applications
52.75.-d Plasma devices

Nonequilibrium atmospheric pressure plasma with ultrahigh electron density and high performance for glass surface cleaning

Masahiro Iwasaki, Hirotoshi Inui, Yuto Matsudaira, Hiroyuki Kano, Naofumi Yoshida, Masafumi Ito, and Masaru Hori

Appl. Phys. Lett. 92, 081503 (2008); http://dx.doi.org/10.1063/1.2885084 (3 pages) | Cited 17 times

Online Publication Date: 26 February 2008

Full Text: Read Online (HTML) | Download PDF

Show Abstract
We produced a nonequilibrium atmospheric pressure plasma by applying an alternative current between two electrodes. The gas temperature and electron density were evaluated using optical emission spectroscopy. It was found that the plasma had gas temperatures from 1800 to 2150 K and ultrahigh electron densities in the order of 1016 cm−3. A remarkably high oxygen radical concentration of 1.6×1015 cm−3 was obtained at a 1% O2/Ar gas flow rate of 15 slm (standard liters per minute). Contact angles below 10° were obtained in the process of glass cleaning with a plasma exposure time of 23 ms.
Show PACS
52.70.Kz Optical (ultraviolet, visible, infrared) measurements
52.25.-b Plasma properties
52.77.Bn Etching and cleaning
81.65.Cf Surface cleaning, etching, patterning
61.43.Fs Glasses
81.05.Kf Glasses (including metallic glasses)

A concept of ferroelectric microparticle propulsion thruster

D. Yarmolich, V. Vekselman, and Ya. E. Krasik

Appl. Phys. Lett. 92, 081504 (2008); http://dx.doi.org/10.1063/1.2888955 (3 pages) | Cited 5 times

Online Publication Date: 28 February 2008

Full Text: Read Online (HTML) | Download PDF

Show Abstract
A space propulsion concept using charged ferroelectric microparticles as a propellant is suggested. The measured ferroelectric plasma source thrust, produced mainly by microparticles emission, reaches ∼ 9×10−4 N. The obtained trajectories of microparticles demonstrate that the majority of the microparticles are positively charged, which permits further improvement of the thruster.
Show PACS
52.75.Di Ion and plasma propulsion
52.50.Dg Plasma sources

Acceleration gradient of a plasma wakefield accelerator

Han S. Uhm

Appl. Phys. Lett. 92, 081505 (2008); http://dx.doi.org/10.1063/1.2887877 (3 pages) | Cited 3 times

Online Publication Date: 28 February 2008

Full Text: Read Online (HTML) | Download PDF

Show Abstract
The phase velocity of the wakefield waves is identical to the electron beam velocity. A theoretical analysis indicates that the acceleration gradient of the wakefield accelerator normalized by the wave breaking amplitude is K0(ξ)/K1(ξ), where K0(ξ) and K1(ξ) are the modified Bessel functions of the second kind of order zero and one, respectively and ξ is the beam parameter representing the beam intensity. It is also shown that the beam density must be considerably higher than the diffuse plasma density for the large radial velocity of plasma electrons that are required for a high acceleration gradient.
Show PACS
41.75.Jv Laser-driven acceleration
29.20.Ej Linear accelerators
52.38.Kd Laser-plasma acceleration of electrons and ions
52.35.-g Waves, oscillations, and instabilities in plasmas and intense beams

Application of quantum cascade lasers in studies of low-pressure plasmas: Characterization of rapid passage effects on density and temperature measurements

J. H. van Helden, S. J. Horrocks, and G. A. D. Ritchie

Appl. Phys. Lett. 92, 081506 (2008); http://dx.doi.org/10.1063/1.2885725 (3 pages) | Cited 9 times

Online Publication Date: 29 February 2008

Full Text: Read Online (HTML) | Download PDF

Show Abstract
The application of quantum cascade lasers in the intrapulse operation mode for low-pressure plasma spectroscopy is hampered by the observation of rapid passage effects, leading to lower quantitative accuracy. We demonstrate that accurate densities and rotational temperatures of CH4 within a CH4 plasma can be obtained by characterizing the rapid passage effects in gas phase conditions prior to carrying out the plasma measurements. Furthermore, we show that the ratios of the integrated absorption of two transitions are not affected by the rapid passage effect and, thus, rotational temperatures of species can be obtained.
Show PACS
52.25.-b Plasma properties
52.70.Kz Optical (ultraviolet, visible, infrared) measurements
Return to All Sections
Close

Google Calendar

ADVERTISEMENT

Go to AIP Home   © AIP Publishing LLC
close