Spectroscopic and thermodynamic study of the ... - ACS Publications

torsional transitions of both conformers in the gaseous phase. A vibrational ..... Our assignments of the important torsional vibrations will be discu...
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J. Phys. Chem. 1980, 84, 773-781

lating discussions with Professor E. A. Halevi are highly appreciated.

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(7) (a) F. P. Schafer, 2s. Bor, W. Luttke, and B. Liphardt, Chem Phys. Lett., 56, 455 (1978); S. Speiser, Appl. Phys., in press; (b) B. Kopainsky, W. Kaiser, and F. P. Schafer, Chem. Phys. Lett., 56, 458 (1978). (8) D. L. Dexter, J . Chem. Phys., 21, 836 (1953). (9) G. Weber, Trans. Faraday Soc., 44, 185 (1950). (10) G. Weber, Nature (London), 180, 1409 (1957). (1 1) G. Weber and F. W. J. Teale, Trans. Faraday Soc., 54, 640 (1958). (12) 0. Schnepp and M. Levy, J . Am. Chem. Soc., 84, 172 (1962). (13) S. Speiser, R. Katraro, S.Welner, and M. B. Rubin, Chem. Phys. Lett., 61, 199 (1979). (14) M. Orenstein, S. Kimel, and S.Speiser, Chem. Phys. Lett., 58, 582 (1978); R. Katraro, A. Ron, and S.Spelser, Chem. Phys., in press. (15) M. B. Rubin and S.Welner, J. Org. Chem., accepted for publication; S.Welner DSc. thesis, Technion, 1978. (16) (a) M. B. Rubin, Top. Curf. Chem., 13(2), 251 (1969); (b) T. Mori, T. Nakahara, and H. Nozaki, Can. J . Chem., 47, 3266 (1969). (17) J. B. Birks, “Photophysics of Aromatic Molecules”, Interscience, New York, 1970. (18) I. B. Berlman, “Handbook of Fluorescence Spectra of Aromatic Molecules”, 2nd ed., Academic Press, New York, 1971. (19) J. T. Dubols and M. Cox, J . Chem. Phys., 38, 2536 (1963). (20) I. Kaplan and J. Jortner, Chem. Phys., 32, 381 (1978). (21) S.Speiser, R. van der Werf, and J. Kommandeur, Chem. Phys., 1, 297 (1973). (22) (a) T. Azumi and S.P. McGlynn, J . Chem. Phys., 37, 2413 (1962); (b) R. M. Hochstrasser and G. J. Small, ibid., 45, 2270 (1965). (23) A. Laubereau and W. Kaiser, Rev. Mod. Phys., 50, 607 (1978). (24) R. Wier, R. Bartetzko, P. Hofmann, and H. D. Scharf, Angew. Chem., Int. Ed. fngl., 16, 400 (1977). (25) Gleiter uses a different notation.24

References and Notes (1) F. C. De Schtyver, N. Boens, and J. Put, Adv. Photochem., 10,359 (1977), and references cited therein. (2) (a) H. D. Ekcker and K. Sandors, Chem. Phys. Lett., 53, 228 (1978); (b) H. D. Becker, I