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We report an experimental observation of intramolecular electron-spin relaxation in isolated, collision-free molecules, in a molecular-beam apparatus. The relaxation was probed by a Stern-Gerlach experiment with Rabi-type inhomogeneous magnets. Relaxation was found to be very efficient for molecules such as chromium acetylacetonate and UCl₄. For the nitroxide free radical TEMPO (2,2,6,6-tetramethylpiperidinooxy) relaxation times of about 0.4 and 200 {μ}s were found in effusive and supersonic beams, respectively.
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Amirav et al. (1981) studied this question.
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