6399 K
126 pp.
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TitleObservation of the Forbidden Magnetic Dipole Transition 6{sup 2}P{sub } --> 7{sup 2}P{sub } in Atomic Thallium
Author(s)Chu, S.
Publication DateOctober 1976
Report NumberLBL-5731
Unique IdentifierACC0284
Other NumbersOSTI ID: 7330001
Research OrgLawrence Berkeley Laboratory, University of California, Berkeley CA (USA) [LBL, LBNL]
Contract NoW-7405-ENG-48
Sponsoring OrgU.S. Energy Research and Development Administration (ERDA)
Subject640302 -- Atomic, Molecular & Chemical Physics -- Atomic & Molecular Properties & Theory; Thallium -- Energy-Level Transitions; Electric Dipole Moments; Electric Fields; Excited States; Fluorescence; Ground States; Hyperfine Structure; Interference; Lasers; Magnetic Dipole Moments; Matrix Elements; P States; Polarization; Scattering Amplitudes; Vapors
KeywordsAmplitudes; Dipole Moments; Electric Moments; Elements; Energy Levels; Fluids; Gases; Luminescence; Magnetic Moments; Metals
Related Web PagesSteven Chu: Laser Cooling and Trapping of Atoms
AbstractA measurement of the 6{sup 2}P{sub } --> 7{sup 2}P{sub } forbidden magnetic dipole matrix element in atomic thallium is described. A pulsed, linearly polarized dye laser tuned to the transition frequency is used to excite the thallium vapor from the 6{sup 2}P{sub } ground state to the 7{sup 2}P{sub } excited state. Interference between the magnetic dipole M1 amplitude and a static electric field induced E1 amplitude results in an atomic polarization of the 7{sup 2}P{sub } state, and the subsequent circular polarization of 535 nm fluorescence. The circular polarization is seen to be proportional to / as expected, and measured for several transitions between hyperfine levels of the 6{sup 2}P{sub } and 7{sup 2}P{sub } states. The result is = -(2.11 +- 0.30) x 10{sup -5} parallel bar e parallel bar dirac constant/2mc, in agreement with theory.
6399 K
126 pp.
View Document 

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