i h-bar times r cross del.
A model of this quantity relies on setting up a correspondence between a "plus-type" and "minus-type" harmonic oscillator and calculating the eigenket. Chew and Frautschi showed that this quantity is equal to a constant times the squared-mass, with the constant identical between Regge trajectories. For a high-symmetry crystal, this quantity is decreased by the loss of symmetry in a given atom's potential well in a process called quenching. The subscript of a term symbol is equal to this quantity for a given energy level. The three operators for this quantity cyclically anticommute, and its operator is equal to (*) negative i h-bar times r cross del. Noether's theorem states that the rotational symmetry of a system leads to the conservation of this quantity; that conservation explains why a skater spins faster when pulling their arms in. For 10 points, name this quantity, which in classical mechanics is equal to the product of angular velocity and the moment of inertia.
A model of this quantity relies on setting up a correspondence between a "plus-type" and "minus-type" harmonic oscillator and calculating the eigenket.
angular momentum [prompt on L; prompt on J; do not accept or prompt on just "momentum"]