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

7 Nov 2011

Volume 99, Issue 19, Articles (19xxxx)

Issue Cover Spotlight Figure

Appl. Phys. Lett. 99, 193101 (2011); http://dx.doi.org/10.1063/1.3657777 (3 pages)

Sungwook Chung, Jonathan R. Felts, Debin Wang, William P. King, and James J. De Yoreo
Enlarge Image | Read More
Return to All Sections
back to top
RSS Feeds

Negative ions: The overlooked species in thin film growth by pulsed laser deposition

M. Esposito, M. Bator, M. Döbeli, T. Lippert, C. W. Schneider, and A. Wokaun

Appl. Phys. Lett. 99, 191501 (2011); http://dx.doi.org/10.1063/1.3660399 (3 pages) | Cited 4 times

Online Publication Date: 8 November 2011

Full Text: Read Online (HTML) | Download PDF

Show Abstract
Plasma plume species from a ceramic La0.4Ca0.6MnO3 target were studied by plasma mass spectrometry as a function of laser fluence, background gas, and deposition pressure to understand the interplay between plasma composition and oxide thin film growth by pulsed laser deposition. The plume composition reveals a significant contribution of up to 24% of negative ions, most notably using a N2O background. The significance of negative ions for thin film growth is shown for La0.4Ca0.6MnO3 films grown in different background conditions where the best structural properties coincide with the largest amount of negative plasma species.
Show PACS
81.15.Fg Pulsed laser ablation deposition
68.55.A- Nucleation and growth
68.55.-a Thin film structure and morphology
52.77.Dq Plasma-based ion implantation and deposition
81.05.Je Ceramics and refractories (including borides, carbides, hydrides, nitrides, oxides, and silicides)

Extreme ultraviolet source at 6.7 nm based on a low-density plasma

Takeshi Higashiguchi, Takamitsu Otsuka, Noboru Yugami, Weihua Jiang, Akira Endo, Bowen Li, Deirdre Kilbane, Padraig Dunne, and Gerry O’Sullivan

Appl. Phys. Lett. 99, 191502 (2011); http://dx.doi.org/10.1063/1.3660275 (3 pages) | Cited 11 times

Online Publication Date: 9 November 2011

Full Text: Read Online (HTML) | Download PDF

Show Abstract
We demonstrate an efficient extreme ultraviolet (EUV) source for operation at λ = 6.7 nm by optimizing the optical thickness of gadolinium (Gd) plasmas. Using low initial density Gd targets and dual laser pulse irradiation, we observed a maximum EUV conversion efficiency (CE) of 0.54% for 0.6% bandwidth (BW) (1.8% for 2% BW), which is 1.6 times larger than the 0.33% (0.6% BW) CE produced from a solid density target. Enhancement of the EUV CE by use of a low-density plasma is attributed to the reduction of self-absorption effects.
Show PACS
52.77.-j Plasma applications
52.25.Os Emission, absorption, and scattering of electromagnetic radiation
52.50.Jm Plasma production and heating by laser beams (laser-foil, laser-cluster, etc.)
42.72.Bj Visible and ultraviolet sources

Oscillatory quantum screening effects on the positronium (Ps) formation in quantum plasmas

Chang-Geun Kim and Young-Dae Jung

Appl. Phys. Lett. 99, 191503 (2011); http://dx.doi.org/10.1063/1.3660741 (3 pages)

Online Publication Date: 9 November 2011

Full Text: Read Online (HTML) | Download PDF

Show Abstract
The oscillatory quantum screening effects on the positronium formation by the positron are investigated in quantum plasmas. It is found that the oscillatory screening effects suppress the positronium formation radius as well as the positronium formation cross section. It is also found that the positronium formation radius decreases with increasing quantum wave number. It is found that the peak position of the differential cross section is receded from the projectile with decreasing quantum wave number. In addition, the oscillatory screening effects on the positronium formation cross section are found to be decreased with an increase of the collision energy.
Show PACS
52.35.Fp Electrostatic waves and oscillations (e.g., ion-acoustic waves)
52.20.Hv Atomic, molecular, ion, and heavy-particle collisions
52.20.Fs Electron collisions

Single-molecule measurement of strand breaks on large DNA induced by atmospheric pressure plasma jet

Hirofumi Kurita, Tomoko Nakajima, Hachiro Yasuda, Kazunori Takashima, Akira Mizuno, John I. B. Wilson, and Samia Cunningham

Appl. Phys. Lett. 99, 191504 (2011); http://dx.doi.org/10.1063/1.3660581 (3 pages) | Cited 1 time

Online Publication Date: 10 November 2011

Full Text: Read Online (HTML) | Download PDF

Show Abstract
We report a single-molecule-based analysis of strand breakages on large DNA molecules induced by an atmospheric pressure plasma jet. We exposed DNA solution to an argon plasma jet; single-molecule observation that involved molecular combing was then used to measure the length of individual DNA molecules. The measured DNA length showed that plasma exposure caused a marked change in length of DNA molecules. The rate of plasma-induced strand breakage on large random-coiled DNA molecules was determined using a simple mathematical model. For strand breaks on large DNA molecules the rate was estimated.
Show PACS
87.14.gk DNA
87.15.B- Structure of biomolecules
Return to All Sections
Close

Google Calendar

ADVERTISEMENT

Go to AIP Home   © AIP Publishing LLC
close