Single-particle spectrum
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] References
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