Hanle effect

The Hanle effect,^[1] also known as zero-field level crossing,^[2] is a reduction in the polarization of light when the atoms emitting the light are subject to a magnetic field in a particular direction, and when they have themselves been excited by polarized light.

Experiments which utilize the Hanle effect include measuring the lifetime of excited states,^[3] and detecting the presence of magnetic fields.^[4]

^ Kastler, Alfred (1974). "50 Jahre Hanle-Effekt: Rückblick und Vorblick" [50 year Hanle Effect: Review and Prospects]. Physik Journal (in German). 30 (9): 394–404. doi:10.1002/phbl.19740300903. ISSN 0031-9279.
^ Lurio, Allen; deZafra, R. L.; Goshen, Robert J. (1964-06-01). "Lifetime of the First ¹P₁ State of Zinc, Calcium, and Strontium". Physical Review. 134 (5A): A1198–A1203. Bibcode:1964PhRv..134.1198L. doi:10.1103/physrev.134.a1198. ISSN 0031-899X.
^ Zimmermann, Dieter (1975). "Determination of the lifetime of the 4p_1/2-state of potassium by Hanle-effect". Zeitschrift für Physik A. 275 (1): 5–10. Bibcode:1975ZPhyA.275....5Z. doi:10.1007/bf01409492. ISSN 0340-2193. S2CID 119987034.
^ Dupont-Roc, J.; Haroche, S.; Cohen-Tannoudji, C. (1969). "Detection of very weak magnetic fields (10⁻⁹ gauss) by ⁸⁷Rb zero-field level crossing resonances". Physics Letters A. 28 (9): 638–639. Bibcode:1969PhLA...28..638D. doi:10.1016/0375-9601(69)90480-0. ISSN 0375-9601.

[1] Kastler, Alfred (1974). "50 Jahre Hanle-Effekt: Rückblick und Vorblick" [50 year Hanle Effect: Review and Prospects]. Physik Journal (in German). 30 (9): 394–404. doi:10.1002/phbl.19740300903. ISSN 0031-9279.

[2] Lurio, Allen; deZafra, R. L.; Goshen, Robert J. (1964-06-01). "Lifetime of the First ¹P₁ State of Zinc, Calcium, and Strontium". Physical Review. 134 (5A): A1198–A1203. Bibcode:1964PhRv..134.1198L. doi:10.1103/physrev.134.a1198. ISSN 0031-899X.

[3] Zimmermann, Dieter (1975). "Determination of the lifetime of the 4p_1/2-state of potassium by Hanle-effect". Zeitschrift für Physik A. 275 (1): 5–10. Bibcode:1975ZPhyA.275....5Z. doi:10.1007/bf01409492. ISSN 0340-2193. S2CID 119987034.

[4] Dupont-Roc, J.; Haroche, S.; Cohen-Tannoudji, C. (1969). "Detection of very weak magnetic fields (10⁻⁹ gauss) by ⁸⁷Rb zero-field level crossing resonances". Physics Letters A. 28 (9): 638–639. Bibcode:1969PhLA...28..638D. doi:10.1016/0375-9601(69)90480-0. ISSN 0375-9601.

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