[Hayao]

Short question, but what molecular design is suitable for creating a molecule with narrow energy potential curvature?

[Corribus]

Not 100% sure what you're after, but a narrow energy well implies a large force constant (in a classical Hooke's Law formulation). Does this give you some ideas?

[Enthalpy]

I too would like clarification about the "narrow energy potential curvature".

[Hayao]

Not 100% sure what you're after, but a narrow energy well implies a large force constant (in a classical Hooke's Law formulation). Does this give you some ideas?

Yes, that was what I was trying to ask.


I am currently looking for a molecule with the narrowest energy well, but have a pi-conjugated system capable of absorbing UV region.

Organic molecules are often weak in terms of bond, and therefore often have wider energy potential curve (surface). I want to make this narrow as possible.

[Enthalpy]

Do you need a molecule bigger than benzene?
http://satellite.mpic.de/spectral_atlas/cross_sections/Aromatic%20compounds/Benzene/C6H6.spc

A cage molecule like fullerenes?
https://commons.wikimedia.org/wiki/File:UV-Vis_C60.jpg

Do you need an organic molecule? Semiconductors (and insulators) permit to adjust many properties, including in the UV region now. You could get an absorption edge or an absorption band by design, which can be narrow depending on the design. Make a suspension of small particles if your compound must flow.

[Enthalpy]

A narrow UV absorption could make a UV imager working with faint light. Reasonably narrow filters would remove unwanted wavelengths including visible and IR light, keeping just one peak of a fluorescent compound, which would make the strong selectivity to remove most ambient light.

Or optical data transmission through the atmosphere despite ambiant light.

UV LEDs would illuminate the scene. Their composition tunes the emitted wavelength. They have some tolerance and some emission line width, so sorting the LEDs out would improve, filtering their output too, and laser diodes would be even better - that's emerging technology in UV.

A competitor is my evanescent wave filter
http://www.scienceforums.net/topic/74445-evanescent-wave-optical-filter/
which doesn't waste power to fluoresce - but is sensitive to the angle.