Magnetic Dipoles and Angular Momenta

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Presentation transcript:

Magnetic Dipoles and Angular Momenta Orbital angular momentum of electron Primitive (wrong) model of the planetary atom The orbital angular momenta are quantized

Magnetic Dipoles and Angular Momenta Spin angular momentum of the electron In the center of mass frame there is a residual angular momentum due to particle spin The electron has spin 1/2 The total angular momentum is

Magnetic Dipoles and Angular Momenta Spin angular momentum of the proton In the center of mass frame there is angular momentum due to proton spin The proton has spin 1/2 g_p = 2(2.79) note that proton is composite

Magnetic Dipoles and Angular Momenta Spin angular momentum of the neutron In the center of mass frame there is angular momentum due to neutron spin The neutron has spin 1/2 g_n = 2(-1.91); note that neutron is electrically neutral, but is also a composite particle

Magnetic Dipoles and Angular Momenta Nuclear Angular Momentum In the center of mass frame the total nuclear angular momentum is quantized e.g. 3He has I=1/2 and g=2(-2.13) 16O* has I=3 and g=2(1.66) *=excited state

Magnetic Dipoles and Angular Momenta Bohr Magneton Nuclear Magneton g-factors Larmor Frequency