25) That the type 2 transition (see Figure 4) for QNO•is divided into the 2.17and 1.90-eV bands (see Table I) and mixes greatly with the 7 -9 transition (type A) should be noted. ( 26) It Is noted that the orbital energy change of MO 10 and 11 (see Figure 4) of ANO•by introducing the N atom at the 8 position (see Table I) is quite small, since the symmetry of these orbitals is a2, having the nodal plane through the C2 axis, so that the atomic orbital coefficient at the atoms along the C2 axis is zero. We can find the same relation as the above in anthracene and naphthalene, too. The atomic orbital coefficients at the 1 and 8 positions of the anthracene anion radical and at the 1, 4, 6, and 9 positions of the naphthalene anion radical are zero for the lowest vacant MO and the next higher MO of the former, and almost are zero for the lowest vacant MO of the latter. The orbital energies of these MO's are therefore insensitive to the replacement of the carbon atoms by nitrogen. (27) In the case of pyrazine di-W-oxide this fact was confirmed by analysis of photoelectron spectra.24 (28) (a) J.