total spin momentum
81STS-82 — Infobox Space mission mission name = STS 82 insignia = Sts 82 patch.png shuttle = Discovery launch pad = 39 A launch = February 11, 1997, 3:55:17 am landing = February 21, 1997, 3:32 am EST, KSC, Runway 33 duration = 9 days, 23 hours, 38 minutes …
82List of mesons — The decay of a kaon (K+ ) into three pions (2 π+ …
83Mass-to-charge ratio — Charge to Mass ratio SI quantity dimension: M/(I⋅T) SI unit: kg/C other units: Th The mass to charge ratio ratio (m/Q) is a physical quantity that is widely used in the electrodynamics of c …
84Curie's law — In a paramagnetic material the magnetization of the material is (approximately) directly proportional to an applied magnetic field. However, if the material is heated, this proportionality is reduced: for a fixed value of the field, the… …
85Magnon — There is a place named Magnon in Gabon. A magnon is a collective excitation of the electrons spin structure in a crystal lattice. In contrast, a phonon is a collective excitation of the crystal lattice atoms or ions. In the equivalent wave… …
86Population inversion — In physics, specifically statistical mechanics, a population inversion occurs when a system (such as a group of atoms or molecules) exists in state with more members in an excited state than in lower energy states. The concept is of fundamental… …
87Lyman-alpha line — In physics, the Lyman alpha line is a spectral line of hydrogen, or more generally of one electron ions, in the Lyman series, emitted when the electron falls from the n = 2 orbital to the n = 1 orbital, where n is the principal quantum number. In …
88Casimir invariant — In mathematics, a Casimir invariant or Casimir operator is a distinguished element of the centre of the universal enveloping algebra of a Lie algebra. A prototypical example is the squared angular momentum operator, which is a Casimir invariant… …
89Selection rule — In physics and chemistry, especially in the context of quantum mechanics, a selection rule is a condition constraining the physical properties of the initial system and the final system that is necessary for a process to occur with a nonzero… …
90Observable — This article is about observables in physics. For the use of the term observable in control theory, see Observability. In physics, particularly in quantum physics, a system observable is a property of the system state that can be determined by… …
