The Zeeman effect and optical pumping are two mechanisms capable of inducing polarization signals in the spectral lines that originate in the outer layers of stellar atmospheres. The Zeeman effect 12 ...

Astronomers have now observed the radio emission from the neutral hydrogen gas (HI) in a nearby galaxy. Hydrogen gas emits radio emission in a spectral line at a very specific frequency of 1420 MHz.

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Resonantly coupled photonic systems exhibiting dispersive and nontrivial line shapes are attracting growing attention in recent years. In particular, light–matter interactions are of interest owing to ...

Transitions between different electronic energy levels in elements occur at unique energies and intensities, giving each element a distinctive emission spectrum. When the energy of an incident photon ...

The groundbreaking discovery proves astronomers’ ability to study distant galaxies without having to venture into space. In a press release, researchers at Leiden University in the Netherlands called ...

SAN DIEGO, December 4, 2019 -- Atom music is a fun new way to explore the atomic world via musical synthesis techniques. Atoms absorb and release energy in the form of photons that we perceive as ...

X-rays are electromagnetic radiations having wavelengths roughly within the range from 0.05 to 100 Angstroms. They were discovered in 1895 by Rontgen. Their similarities to light led to the tests of ...

Yuri Ralchenko led one of the oldest teams at the National Institute of Standards and Technology. The fate of some experiments hangs in the air. Lost Science Yuri Ralchenko led one of the oldest teams ...

Spectral examination is now the norm in fundamental and applied research, in applications covering detection of chemicals, process instrumentation, characterization of novel materials, and disease ...