The fun way to manipulate atoms

With their potential to perform calculations far beyond the reach of conventional supercomputers, machines harnessing certain quantum physics phenomena are expected to change the way the world solves complex problems. They ...

X-ray imaging provides clues to fracture in solid-state batteries

Solid-state batteries—a new battery design that uses all solid components—have gained attention in recent years because of their potential to hold much more energy while simultaneously avoiding the safety challenges of ...

Science suffers collateral damage as US, China tensions rise

A rise in US visa denials for Chinese academics and intensified scrutiny of alleged links to Beijing over fears of potential espionage are having a chilling effect on long-standing research collaboration, researchers say.

Emissions rose an 'unsustainable' 2% in 2018: study

Global carbon emissions grew by 2.0 percent last year, the highest rate since 2010-2011, a closely-watched review by energy giant BP said Tuesday, calling the trend "unsustainable".

New York takes aim at skyscrapers' sky-high energy usage

It's a tall order indeed: How do you make aging, energy-hungry skyscrapers more efficient and less polluting? The city of New York, the historic capital of the skyscraper, is determined to do so by requiring the enormous ...

page 1 from 23

Energy level

A quantum mechanical system or particle that is bound, confined spatially, can only take on certain discrete values of energy, as opposed to classical particles, which can have any energy. These values are called energy levels. The term is most commonly used for the energy levels of electrons in atoms or molecules, which are bound by the electric field of the nucleus. The energy spectrum of a system with energy levels is said to be quantized.

If the potential energy is set to zero at infinity, the usual convention, then bound electron states have negative potential energy.

Energy levels are said to be degenerate, if the same energy level is obtained by more than one quantum mechanical state. They are then called degenerate energy levels.

This text uses material from Wikipedia, licensed under CC BY-SA