7旋光色散和圆二色光谱OVERVIEW 1. A molecule is optically active if it interacts differently with left and right circularly polarized light. This interaction can be detected either as a differential change in velocity of the two beams through the sample optical rotatory dispersion (ORD) or as a differential absorption of each beam circular dichroism (CD).2.ORDspectraarecharacterizedby ， whichis thespecificrotationatagivenwavelength，orthe molar rotation . Both have units of degree cm 2 dmol 1 .CDspectraarec
