Acoustic modes and nonbonded interactions of the double helix

Abstract

Abstract Observations of acoustic velocities in DNA fibers have been used to refine nonbonded force constants for the DNA double helix. Long‐range forces are found to be needed for A conformation and are likely to dominate in B conformation as well. The acoustic dispersion curves are described and calculated. A correction due to the effects of water is calculated. The effect of nonbonded interaction on other vibrational modes is calculated.