Brus equation emission energy Δ"E" = "hc"/λ, where c is the speed of light). This is useful for calculating the radius of a quantum dot from experimentally determined parameters. The overall equation is "E", "m"*, and "m"* are unique for each nanocrystal composition. For example, with CdSe nanocrystals: Brus equation The Brus equation can be used to describe the emission energy of quantum dot semiconductor nanocrystals (such as CdSe nanocrystals) in terms of the band gap energy "E", Planck's constant "h", the radius of the quantum dot "r", as well as the effective mass of the excited electron "m"* and of the
Helmholtz equation the original complex amplitude "A": The Fresnel diffraction integral is an exact solution to the paraxial Helmholtz equation. There is even a subject named "Helmholtz optics" based on the equation, named in honour of Helmholtz. The inhomogeneous Helmholtz equation is the equation where "ƒ" : R → C is a function with compact support, and "n" = 1, 2, 3. This equation is very similar to the screened Poisson equation, and would be identical if the plus sign (in front of the "k" term) is switched to a minus sign. In order to solve this equation uniquely, one needs to