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Physical Review

Polarization of Fluorescence Radiation

Irving S. Lowen, GREGORY A. BREIT

Published Jan 15, 1934• 2 citations
Publisher
DOI
10.1103/physrev.45.120

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If the distance between two or more energy levels is comparable to their natural breadth, the levels cease to act independently. The coupling between the levels is then describable by means of a "damping constant matrix." The usual discussions concern themselves with a diagonal damping constant. Below a systematic treatment of emission, absorption and fluorescence is given without this restriction and it is shown how in general the frequencies of emission lines are affected by this radiation coupling. The theory is applied to the calculation of the polarization of fluorescence radiation. It is shown that the coupling state of the lower group of levels of the fluorescence line does not influence the polarization. Results of detailed calculations are given for the polarization of $\mathrm{H}\ensuremath{\alpha}$ excited by absorption of the second line of the Lyman series.
The atomic fluorescence can be explained perfectly by the classical theories of electric dipole radiation.The changes of fluorescence intensity of Sr atomic beam are detected and analysed by changing the polarization of the laser beam which interacts with Sr atomic beam,and the characterization of the electric dipole radiation of Sr atom is detected in the far zone.It is experimentally demonstrated that the electric dipole radiates energy in the far zone is based upon the relationship of sin2θ,by which the fluorescence can be detected more effectively.