Physics and chemistry of the Purcell alignment

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Abstract
The paramagnetic alignment of suprathermally rotating grains is discussed in view of recent progress in understanding the subtle processes taking place over the grain surface. It is shown that, in typical ISM conditions, grains with surfaces of defected silicate or polymeric carbonaceous material are likely to exhibit enhanced alignment, while those with surfaces of aromatic carbonaceous material or graphite are not. The critical grain sizes and temperature for the Purcell alignment are obtained, and the preferential alignment of large grains is established.
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