Electronic transitions
From apm
Especially relevant of piezochemical mechanosynthesis is inter system crossing.
Flipping spins fast such that parallel spins don't block covalent bond formation, or make it unreliable, or make it inefficient.
Phosphorescense may be relevant for mechanooptical energy conversion where a long de-excitation/decay time allows for
a mechanical transport to a different location between mechanical excutation and optical deexcitation.
See: Optical effects "photonic steampunk" section
Overview:
| multiplicity constant | multiplicity gets changed (slow, since "forbidden") | ||
|---|---|---|---|
| energy is released | with emission of radiation | fluorescence z. B. [math]S_1 \rightarrow S_0[/math] |
phosphorescence z. B. [math]T_1 \rightarrow S_0[/math] |
| radiationless | Schwingungs- bzw. vibronic relaxation* z. B. [math]S_0^* \rightarrow S_0[/math] und [math]T_1^* \rightarrow T_1[/math] | ||
| energy stays constant | inner conversion z. B. [math]S_1 \rightarrow S_0^*[/math] |
Intersystem Crossing z. B. [math]S_1 \rightarrow T_1^*[/math] und [math]T_1 \rightarrow S_0^*[/math] | |
Related
External links
Wikipedia:
- (en): Intersystem crossing
- (de): Intersystem Crossing – (German version has a nice table)
- (en): Internal conversion (chemistry)
- (de): Innere Umwandlung – (German version has a nice table)
- (en): Vibronic coupling
- (en): Vibronic_spectroscopy
- (de): Photophysikalischer Prozess – no english version of this page as of yet (2021-06)
