Cathode ray
hideCathode rays (also called an electron beam or e-beam) are streams of electrons observed in vacuum tubes, i.e. evacuated glass tubes that are equipped with at least two metal electrodes to which a voltage is applied, a cathode or negative electrode and an anode or positive electrode. They were discovered by German scientist Johann Hittorf in 1869 and in 1876 named by Eugen Goldstein kathodenstrahlen (cathode rays). Electrons were first discovered as the constituents of cathode rays. In 1897 British physicist J. J. Thompson showed the rays were composed of a previously unknown negatively charged particle, which was named electron.
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News tagged with electron beam
Caltech scientists film photons with electrons
Dec 16, 2009 |
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(PhysOrg.com) -- Techniques recently invented by researchers at the California Institute of Technology -- which allow the real-time, real-space visualization of fleeting changes in the structure of nanoscale ...
Microscopy reveals structure of calcite shells
Nov 30, 2009 |
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(PhysOrg.com) -- Lara Estroff and colleagues have taken a deep, detailed look at the way lab-created calcite crystals, similar to those found in nature, grow in tandem with proteins and other large molecules.
Tapering a Free-Electron Laser to Extract More Juice
Nov 20, 2009 |
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(PhysOrg.com) -- Researchers from the NSLS and Science Applications International Corporation (SAIC) have demonstrated a technique that could be used to significantly improve the quantity and quality of light ...
Novel nano-devices developed by U of T researchers
Nanotechnology / Nanomaterials
Nov 10, 2009 |
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(PhysOrg.com) -- University of Toronto researchers continue to uncover the mysteries of space. But even the best astronauts in the world are stymied if the spaceship doesn't launch. When the countdown stops, it is often because ...
Electron self-injection into an evolving plasma bubble
Nov 02, 2009 |
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Particle accelerators are among the largest and most expensive scientific instruments. Thirty years ago, theorists John Dawson and Toshiki Tajima proposed an idea for making them thousands of times smaller: ...
Micro Sparky: Engineering the tiniest Sun Devil
Oct 30, 2009 |
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(PhysOrg.com) -- An Arizona State University engineering student may have found the tiniest - yet most cleverly inventive - way to show school spirit.
Simultaneous Nanoscale Imaging of Surface and Bulk Atoms
Sep 21, 2009 |
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(PhysOrg.com) -- Brookhaven Lab scientists have developed a new scanning electron microscope capable of selectively imaging single atoms on a surface while simultaneously probing atoms throughout the sample?s ...
New interferometer could simplify materials research
Aug 13, 2009 |
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(PhysOrg.com) -- “Most current hard x-ray interferometers are based on crystals, which require their high quality and high mechanical stability,” Anatoly Snigirev tells PhysOrg.com. “This can make x-ray interferometry quite ...
World's Most Precise Microscope Headed For UVic
Jul 16, 2009 |
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A new microscope that views the subatomic universe -- the first of its kind in the world -- is being built for the University of Victoria, Canada, in collaboration with Hitachi High-Technologies.
Aluminum-oxide nanopore beats other materials for DNA analysis
Nanotechnology / Nanomaterials
Jun 02, 2009 |
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Fast and affordable genome sequencing has moved a step closer with a new solid-state nanopore sensor being developed by researchers at the University of Illinois.
Molecules which flip into their own mirror image
May 29, 2009 |
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Catalysts do function, despite the fact that not all the chemical reactions (and partial reactions) which occur are fully understood, including those which take place during the treatment of automobile exhaust. ...
Picosecond Oscilloscope
May 26, 2009 |
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An oscilloscope is a device for displaying signals that are too fast to be seen by the human eye. Typically the signal consists of a voltage level that changes quickly moment by moment (over millisecond to nanosecond timescales). ...
World's First Hard X-ray Laser Achieves 'First Light'
Apr 21, 2009 |
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(PhysOrg.com) -- The world's brightest X-ray source sprang to life last week at the U.S. Department of Energy's SLAC National Accelerator Laboratory. The Linac Coherent Light Source (LCLS) offers researchers ...
A miniature synchrotron for your home lab
Jan 07, 2009 |
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In 2004 Lyncean Technologies announced the construction of the Compact Light Source (CLS), a miniature synchrotron which uses inverse Compton scattering to produce high-intensity, tunable, near-monochromatic ...
Free Electron Lasers and You: An LCLS Primer
Dec 05, 2008 |
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(PhysOrg.com) -- In a few short months, the Linac Coherent Light Source will start operation as the world's first hard X-ray free electron laser, pushing SLAC National Accelerator Laboratory to the frontier ...
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