Single-particle spectrum
Template:Short description Template:Refimprove The single-particle spectrum is a distribution of a physical quantity such as energy or momentum.
In formal Quantum field theory, a single-particle spectrum is defined as: "the spectrum of the operators of H, P on the space B."[1]
The study of particle spectra allows us to visualize the global picture of particle production.[2] This is especially helpful for visualizing the structure of nanoparticles.[3]
The existence of a "non-smooth" single-particle spectrum is a piece of evidence (proof) that the Fermi level exists.[4]
The spectrum are particles that are in space: "the single particle spectrum overlaps ... and the excitations of the electron gas becomes a particle."[5] This process uses Raman spectroscopy, developed by Chandrasekhar Venkata Raman.[3]