APPENDIX A.NATURALUNITSThe dimensionless constant11.,which was named the fine structu re con-stant, has a significance which goes beyond its role in Equation 4.13.Itsmagnitude may be regarded as a measur e of th e strength of the coupling ofparticles of charge±eto electromagnetic fields.Indeed, one may calle2the"strength"of the interactionbetween±eand electro-magnetic fields, but it is more "natural" to use th e dimensionless quantity11.=e2Jficfor this purpose.Since oc is independent of mass it can be used todescribe the electromagneti c interactions of all particles of charge±e.An appropriate set of natural units for describing atomic phenomena isas follows :In terms of th e natural units and the coupling constant11.,the relationshipsthat were previously found for the hydrogen atom may be expressed as follows:CHAPTER 4Variablemasslengthtimeenergyvelocityangular momentumFirst Bohr orbit :APPENDIX ANatural UnitDescriptionmoelectron rest massIi
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This note was uploaded on 08/06/2008 for the course PHYS 25 taught by Professor Nelson during the Spring '08 term at UCSB.