By Louis J. Allamandola (auth.), Professor Dr. Ivan Gutman, Professor Dr. Sven J. Cyvin (eds.)

Contents: L.J. Allamandola, Moffett box, CA, united states: Benzenoid Hydrocarbons in area: The proof and Implications

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196:269 11. L~ger A, Puget JL (1984) Astron. Ap. 137:L5 12. Allamando|a LJ, Tielens AGGM, Barker JR (1985) Ap. J. (Letters) 290:L25 13. Allamandola LJ, Tielens AGGM, Barker JR (t987) In: L6ger A, d'Hendecourt LB, Boccara N (eds) Polycyclic aromatic hydrocarbons and astrophysics. D. Reidel, Dordrecht p 255 14. Duley WW (1989) In: Allamandola LJ, Tielens AGGM (eds) Interstellar dust. Kluwer, Dordrecht p 141 15. Cohen M, Allamandola LJ, Tielens AGGM, Bregman JD, Simpson JP, Witteborn F, Wooden D, Rank D (1986) Ap.

J. 341:270 55. Allamandola LJ, Sandford SA (1988) In: Bailey ME, Williams DA (eds) Dust in the universe Cambridge University Press p 229 56. Cohen M, Tielens AGGM, Allamandola LJ (1985) Ap. J. (Letters) 299:L93 57. Castelaz MW, Sellgren K, Werner MW (1987) Ap. J. 313:853 58. Sellgren K (1989) In: Allamandola LJ, Tielens AGGM (eds) Interstellar dust, Kluwer, Dordrecht, p 103 59. Boulanger F, Beichman C, Desert FX, Helou G, Perault M, Ryter C (1988) Ap. j. 332:328 60. Russell RW, Soifer BT, Willner SP (1977) Ap.

The total distortion energies, as well as their cr and n components are displayed in Table 3, as calculated at the 6-31G/n-CI level. 1 Six-Membered Rings The qualitative VB model predicts that the n distortive propensity varies like the strength of the two-electron-two-center (2e-2c) n bond, or its singlet-triplet energy gap AEsT. This latter value increases from column V to column VI in the periodic table, and decreases from first row to second row. In accord with the VB model, the calculated AE" values follow the same tendency.

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