The unit sphere representation method of (hyper)polarizabilities, which can visually exhibit the characteristics of molecular response properties in terms of (hyper)polarizability tensors, is a powerful means for comprehensive characterization of molecular (hyper)polarizabilities . The unit sphere representation of the (hyper)polarizabilities of C 18 -(CO) n (n = 2, 4, and 6) in the static field are depicted in As shown in Tables and, with regard to molecular polarizability and second hyperpolarizability, the X-axis tensorial components of C 18 -(CO) 2 and the Y-axis tensorial components of C 18 -(CO) 4 account for the main contribution to the response properties. However, the tensorial components of the polarizability and second hyperpolarizability of molecule C 18 -(CO) 6 are exactly equal for X-and Y-axes. Since their molecular orientation is set to be symmetrical about the X-axis as shown in Fig. , the three molecules only have a nonvanishing first hyperpolarizability component along the X-axis, while the components in directions of other two axes (Y-and Z-axes) are zero. The (hyper)polarizability tensorial components listed in Tables and mutually confirm the correctness of the conclusion drawn from the molecular (hyper)polarizability tensor map in Fig. . Therefore, we will focus on those tensorial components that contribute most to the overall (hyper)polarizabilities of the molecules in the following discussion.