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11 Aug 2003

Volume 83, Issue 6, pp. 1063-1275

Issue Cover Spotlight Figure

Appl. Phys. Lett. 83, 1163 (2003); http://dx.doi.org/10.1063/1.1599972 (3 pages)

M. C. Rogge, C. Fühner, U. F. Keyser, R. J. Haug, M. Bichler, G. Abstreiter, and W. Wegscheider
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Size determination of nanoparticles in low-pressure plasma with laser-induced incandescence technique

G. S. Eom, C. W. Park, Y. H. Shin, K. H. Chung, S. Park, W. Choe, and J. W. Hahn

Appl. Phys. Lett. 83, 1261 (2003); http://dx.doi.org/10.1063/1.1599965 (3 pages) | Cited 10 times

Online Publication Date: 5 August 2003

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We derive analytic formulas describing the temporal behavior of the laser-induced incandescence (LII) signal in both case of the heat transfer governed by radiation and collision. Using these formulas, we can describe the temporal behavior of the LII signal and determine the dimension of nanosize particles in low-pressure plasma. Simple calibration procedure is introduced for quantitative measurement of the particle size with the LII technique. © 2003 American Institute of Physics.
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06.30.Bp Spatial dimensions (e.g., position, lengths, volume, angles, and displacements)
61.46.-w Structure of nanoscale materials
42.62.Eh Metrological applications; optical frequency synthesizers for precision spectroscopy

Measurements of electron emission uniformity from cathodes in high-voltage electron beam diodes

A. E. Blaugrund

Appl. Phys. Lett. 83, 1264 (2003); http://dx.doi.org/10.1063/1.1600509 (2 pages) | Cited 10 times

Online Publication Date: 5 August 2003

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Spatial uniformity of electron emission from velvet cathodes has been measured by observing the distribution of electrons hitting the anode in a planar high-voltage diode. It is shown that unless all electrons move parallel to the diode axis, the electron distribution measured at the anode does not represent the cathode emission pattern. Here, parallel trajectories were achieved by applying a strong, uniform axial magnetic field. A 5 ns gated ICCD camera recorded light from a fast anode scintillator. The emission from two brands of velvet was found to be mostly concentrated in small spots with density of about 55/cm2. The pixel-to-pixel standard deviation of the emission amounted to at least 16%. © 2003 American Institute of Physics.
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84.47.+w Vacuum tubes
84.70.+p High-current and high-voltage technology: power systems; power transmission lines and cables

Carbon nanotube tips for thermomechanical data storage

Mark A. Lantz, Bernd Gotsmann, Urs T. Dürig, Peter Vettiger, Yoshikazu Nakayama, Tetsuo Shimizu, and Hiroshi Tokumoto

Appl. Phys. Lett. 83, 1266 (2003); http://dx.doi.org/10.1063/1.1600835 (3 pages) | Cited 21 times

Online Publication Date: 5 August 2003

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We report the demonstration of thermomechanical data storage in a poly(methylmethacrylate) film using a multiwalled carbon nanotube (MWCNT) tip. Indentation densities of >250 Gbits/in2 are achieved. The power efficiency of indent writing with MWCNT tips is found to be higher than that of conventional silicon tips owing to better heat transfer at the tip–polymer interface. © 2003 American Institute of Physics.
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07.79.Lh Atomic force microscopes
85.35.Kt Nanotube devices

Infrared photoelectron emission from Scandate dispenser cathodes

Kevin L. Jensen, Donald W. Feldman, Matt Virgo, and Patrick G. O’Shea

Appl. Phys. Lett. 83, 1269 (2003); http://dx.doi.org/10.1063/1.1600514 (3 pages)

Online Publication Date: 5 August 2003

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Nonlinear photoelectric emission from Scandate dispenser cathodes using 1.064-μm radiation in nanosecond-scale pulses has been observed. Unlike single-photon emission, the photocurrent is a strong function of both the initial lattice temperature and the applied electric field as well as laser intensity. The parametric data is compared to a theoretical model for the process, and the data is shown to be explicable in terms of laser heating of the electron gas and subsequent photoemission. © 2003 American Institute of Physics.
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85.60.Ha Photomultipliers; phototubes and photocathodes
79.60.-i Photoemission and photoelectron spectra
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