Chemists at Hokkaido University and the Institute for Chemical Reaction Design and Discovery (WPI-ICReDD) have developed the first high-performance catalyst specifically designed and optimized for solid-state, mechanochemical ...
Polymers
Mar 9, 2023
0
81
For now, Europe's Euclid spacecraft sits quietly in a sterilized room in the south of France, its golden trim gleaming under the fluorescent light.
Astronomy
Feb 25, 2023
1
231
An extremely large earthquake has occurred in the southeast of Turkey, near the border with Syria. Data from seismometers which measure shaking of the ground caused by earthquake waves suggest this this event, in the early ...
Earth Sciences
Feb 7, 2023
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54
Many people think of the annual UN climate talks as talkfests which achieve only incremental change, at best. Activist Greta Thunberg has described them as "blah blah blah" moments—grossly inadequate and too often hijacked ...
Environment
Jan 13, 2023
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36
In recent years, several states have created or helped to fund specialized banks that lend money to homeowners and businesses for energy-saving and climate projects. Now, states have billions more reasons to establish such ...
Economics & Business
Jan 9, 2023
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0
How will the map of global energy change? Will sky-high energy prices boost renewables? How will the industrial landscape shift? What will the lasting economic impacts be? How will the energy crisis affect climate action? ...
Economics & Business
Dec 22, 2022
0
2
Scientists in the STAR collaboration at the Relativistic Heavy Ion Collider (RHIC)—an atom smasher at the U.S. Department of Energy's Brookhaven National Laboratory—have published a comprehensive analysis aimed at determining ...
General Physics
Dec 19, 2022
0
326
As the United States and other countries around the world begin to transition to utilizing green technologies on a larger scale, it will be necessary to have access to the minerals needed to build the infrastructure for those ...
Environment
Dec 2, 2022
2
9
President Joe Biden on Thursday tried to allay concerns raised by French President Emmanuel Macron about a clean energy law that benefits electric vehicles and other products made in North America. But the U.S. and Europe ...
Environment
Dec 2, 2022
0
6
First, the bad news: Nothing is free. Moving the world energy system away from fossil fuels and into renewable sources will generate carbon emissions by itself, as construction of wind turbines, solar panels and other new ...
Environment
Nov 21, 2022
3
43
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.
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