MIRA2015 Lecture Notes - Lecture 3: Angular Momentum, Gyromagnetic Ratio, Oscillation

• School: Curtin University
• Department: Medical Imaging, Radiology & Radiography
• Course: MIRA2015
• Professor: Cat Kealley

Document Summary

Do(cid:374)(cid:859)t (cid:374)eed to (cid:271)e rotati(cid:374)g to ha(cid:448)e a spi(cid:374). Charged parti(cid:272)le i(cid:374) earth(cid:859)s (cid:373)ag(cid:374)eti(cid:272) field so all parti(cid:272)les are pre(cid:272)essi(cid:374)g. pi(cid:374) is a pure quantum mechanical property that comes from solving some relativistic equations of quantum mechanics. Magnetic moment vector quantity, measures tendency of object (with small magnetic dipole/current loop) to interact with external magnetic field. with north and south poles (dipole) -> magnetic dipole moment. H ato(cid:373)(cid:859)s i(cid:374)tri(cid:374)si(cid:272) (cid:373)ag(cid:374)eti(cid:272) properties (cid:448)isualised as emanating from a tiny bar magnet. Magnetic moment () will seek to align with an externally applied magnetic field (b ). What is spinning? spin: intrinsic angular momentum magnetism of a particle, however particle itself is not actually spinning or rotating. Magnetic moment is a property of proton (same as charge is a property). Lone proton not rotating possesses spin, s -> magnetic moment, can point in any direction (not just spin up and spin down) Spin: spin angular momentum (incorporates intrinsic magnetism), s.