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Conference Paper

Admixture of Dipole and Quadrupole Atomic Transitions in the Presence of External Magnetic Field

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Citation

Oo, Y. Y., Thant, W. M., Nagendra, K., & Ramachandran, G. (2019). Admixture of Dipole and Quadrupole Atomic Transitions in the Presence of External Magnetic Field. In A. M. Gandorfer, A. Lagg, & K. Raab (Eds.), Proceedings of the 9th Solar Polarization Workshop SPW9. doi:10.17617/2.3188298.

Abstract

The admixture effect of dipole and quadrupole type atomic transitions on the Stokes parameters characterizing the emitted radiation in the presence of an external magnetic field is studied.
The transition from an upper level with angular momentum J_u = 3/2 to a lower level with angular momentum J_l = 1/2 is considered to take account of the admixture effect. The analytical expressions
showing the emitted Stokes parameters for the case of upper and lower levels having same parities are derived. It is shown that the radiative transition probabilities of magnetic dipole (M1) and electric quadrupole transition (E2) are more intense than those of electric dipole transition (E1) and magnetic
quadrupole transition (M2). The polarization components that are not usually seen in the Stokes I; Q and V profiles appear due to the admixture effect. The interference of the polarization components with opposite signs is responsible for the smaller strength of Stokes I; Q; V in admixture transition compared
to those observed in pure transition. In pure dipole transition case, U Stokes profile is always zero for all emitted radiation directions. However, the Stokes U profile arises only due to the admixture effect.