Difference between revisions of "Fun with spins"
(basic page) |
(→Some other maybe interesting related trivia: added headlines and note on weak effect of nuclear spins) |
||
| Line 12: | Line 12: | ||
== Some other maybe interesting related trivia == | == Some other maybe interesting related trivia == | ||
| + | |||
| + | === Electron spins === | ||
Oxygen has as its unexcited state the [https://en.wikipedia.org/wiki/Triplet_state triplet state] with unpaired parallel electron spins | Oxygen has as its unexcited state the [https://en.wikipedia.org/wiki/Triplet_state triplet state] with unpaired parallel electron spins | ||
| Line 25: | Line 27: | ||
(Wikipedia: [https://en.wikipedia.org/wiki/Helium_atom Helium atom]) | (Wikipedia: [https://en.wikipedia.org/wiki/Helium_atom Helium atom]) | ||
| − | + | === Nuclear spins === | |
A rare case where nuclear spins have a huge (physical) effect are the | A rare case where nuclear spins have a huge (physical) effect are the | ||
[https://en.wikipedia.org/wiki/Spin_isomers_of_hydrogen nuclear spin isomers of hydrogen]. | [https://en.wikipedia.org/wiki/Spin_isomers_of_hydrogen nuclear spin isomers of hydrogen]. | ||
| + | |||
| + | Nuclear spins usually have only minor effect on physical and chemical properties. <br> | ||
| + | But they are very useful for analytic (and in the future maybe computation) purposes. | ||
== Related == | == Related == | ||
Revision as of 12:21, 16 June 2021
Contents
Spin in piezochemical mechanosynthesis
Intersystem_crossing:
This can lead to the problem in piezochemical mechanosynthesis that when pressing moieties together too fast to hard,
the reaction can actually lock up and slow down rather than speed up. (wiki-TODO: check details)
Spin flips in tool-tips (to create an anti-parallel bonding singlet state) can be influenced by
nearby massive atoms with high spin orbit coupling.
(wiki-TODO: find out how that is supposed to be working)
Electron spins
Oxygen has as its unexcited state the triplet state with unpaired parallel electron spins
(meaning it is a stable diradical). This is quite unusual.
The excited state of oxygen is singlet oxygen with paired antiparallel spins.
Singlet oxygen is quite metastable leading to fluorescence (red colored)
Ortohelium is heliums ground state (with necessarily paired antiparallel spins).
Parahelium with unpaired parallel spins (and necessarily one electron in the 2s shell)
is surprisingly metastable (despite being excited by a whopping 19,8 eV). There is a "forbidden" state transition.
(Wikipedia: Helium atom)
Nuclear spins
A rare case where nuclear spins have a huge (physical) effect are the nuclear spin isomers of hydrogen.
Nuclear spins usually have only minor effect on physical and chemical properties.
But they are very useful for analytic (and in the future maybe computation) purposes.
Related
- Mechanically stable electronically excited states
- Polyaromatic pigments, F-centers in gemstones, ...See: color emulation
