Journal
ASTROPHYSICAL JOURNAL
Volume 536, Issue 1, Pages L15-L18Publisher
UNIV CHICAGO PRESS
DOI: 10.1086/312720
Keywords
atomic processes; cosmic microwave background; dust, extinction; polarization
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We show that the energy-level splitting that arises from grain rotation ensures that paramagnetic dissipation acts at its maximum rate, i.e., the conditions for paramagnetic resonance are automatically fulfilled. We refer to this process as resonance relaxation. The differences between the predictions of classical Davis-Greenstein relaxation and resonance relaxation are most pronounced for grains rotating faster than 1 GHz, i.e., in the domain in which classical paramagnetic relaxation is suppressed. This mechanism can partially align even very small grains, resulting in linearly polarized microwave emission that could interfere with efforts to measure the polarization of the cosmic microwave background.
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