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The dichroic tensor of flexible helices in a magnetic field

✍ Scribed by Robert W. Wilson

Publisher
Wiley (John Wiley & Sons)
Year
1978
Tongue
English
Weight
188 KB
Volume
17
Category
Article
ISSN
0006-3525

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✦ Synopsis

Recently Maret et al.' presented the results of experiments on the birefringence of DNA oriented by means of a strong magnetic field. These measurements can be theoretically related to stiffness parameters of the chain in a way closely related to the calculation of the dichroism or polarizability of a chain relative to its end-to-end vector. In a previous paper,2 the calculation of the dichroism of DNA-like helices was outlined using two rather simple models for the bending of the helix. This communication shall draw on these calculations in deriving an expression for the linear dichroism or optical polarizability of a flexible helix in a magnetic field. Although the final results given here apply only to the isotropic model for bending, the method of calculation for other models will be indicated.

Consider a diamagnetic molecule in a magnetic field with the laboratory axis, 3, being in the direction of the applied field. The energy of a molecule in a given configuration in this field is given by

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