A puff of lithium vapor red blob is cooled to few hundred microkelvins and levitated in an ultrahigh vacuum using electromagnetic fields. The program in atomic physics involves work with simple atomic and molecular systems in the gas phase, at surfaces, and in solids. The inherent precision of measurements on simple atomic and molecular systems is used in studies of fundamental physics as well as for certain applications. Experimental work frequently involves the use of Nd:YAG lasers, dye lasers, diode lasers, Ti:sapphire lasers, argon and krypton ion lasers, optical, ultraviolet and infrared spectrometers, microwave and radiofrequency spectrometers, signal processing equipment, and computers and their interfacing to apparatus.
Students often need a detailed theoretical understanding of certain aspects of quantum mechanics, group theory, electricity and magnetism, nuclear physics, surface physics, physical chemistry, fluid dynamics, and plasma physics to complete their dissertation work. An important area of active research is the study of spin interactions of atoms and nuclei.
Princeton has historically been, and continues to be, a world center for such activities. For instance, optical pumping is used to produce high polarizations in vapors of alkali-metal atoms.
Hyperpolarized Helium Lung Image Through spin-exchange collisions, the polarization of the alkali-metal atoms can be transferred to a variety of noble-gas nuclei. The use of "optical pumping spin-exchange" makes it possible to polarize the nuclei of large quantities of gases such as He-3 and Xe for a variety of applications.
One such application is a new technique for doing magnetic resonance imaging MRI. Polarized noble gases are introduced into the lungs of an animal and subsequently imaged using fairly standard MRI techniques. The use of laser-polarized noble gases results in enormous increases in signal strength, thus opening many new possibilities for medical imaging.
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Preface Part I. Static Field Scattering 1. Classical Scattering and Quantum Formulation 2. Partial Wave Analysis 3.
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