期刊
ORIGINS OF LIFE AND EVOLUTION OF BIOSPHERES
卷 35, 期 1, 页码 29-60出版社
SPRINGER
DOI: 10.1007/s11084-005-7770-6
关键词
circularly polarized light; enantiomers; homochirality; origins of life; star formation regions
类别
Ultraviolet circularly polarised light has been suggested as the initial cause of the homochirality of organic molecules in terrestrial organisms, via enantiomeric selection of prebiotic molecules by asymmetric photolysis. We present a theoretical investigation of mechanisms by which ultraviolet circular polarisation may be produced in star formation regions. In the scenarios considered here. light scattering produces only a small percentage of net circular polarisation at any point in space, due to the forward throwing nature of the phase function in the ultraviolet. By contrast, dichroic extinction can produce a fairly high percentage of net circular polarisation (similar to 10%) and may therefore play a key role in producing an enantiomeric excess.
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