Typically, lasers emit
light of one pure color, or wavelength.
Materials engineering allowed the Bell Labs researchers to achieve a high-powered laser that can emit
light over a broad range of the electromagnetic spectrum.
Scheinberg has turned to bismuth-213, which emits only alpha radiation, to treat leukemia (SN: 2/22/97, p.
This isotope, which emits beta particles and low-energy gamma rays, would also be injected directly into the joints.
Our new OLED compound emits
a very bright, beautiful green color that is 50% more efficient than previously published results for OLED's.
Black holes that emit
their highest-intensity radiation at an X-ray energy of 1,000 electronvolts; were found to spin rapidly but in a direction opposite to the disk.
A group led by Jean Frechet of the University of California, Berkeley has also made significant progress in developing dendrimer LEDs that emit
Subsequent material falling onto a black hole might not emit
significant amounts of radiation.
A dye molecule emits
a photon only after taking in two photons of half the energy.
2, 1995, by NASA's Compton Gamma Ray Observatory (GRO), a spacecraft carrying X-ray and gamma-ray telescopes, this celestial source emits
pulses of X rays every 2 seconds.
The large ephemeral field should energize electrons in the mesosphere, causing them to crash into nitrogen, which then emits
red light, he says.
An atom caught between the laser beams moves around in a random fashion as it emits
photons until by chance it stops for an instant.
The dye in turn emits
orange light with a wavelength of 617 nanometers.
The "semiconducting conjugated polymer" emits
light when positive and negative charges, supplied by electrodes on opposite sides of he thin plastic film, meet on the same bit of polymer chain.
When electrons drop into those middle levels, they emit
photons with less energy, and therefore longer wavelengths, than usual.