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Laser spectroscopy of crossed molecular beams: The dissociation energy of BaI from energy-balance measurements

J. Chem. Phys. 93, 8544 (1990); doi:10.1063/1.459292

Issue Date: 15 December 1990

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P. H. Vaccaro, D. Zhao, A. A. Tsekouras, C. A. Leach, W. E. Ernst, and R. N. Zare
Department of Chemistry, Stanford University, Stanford, California 94305-5080
Through application of energy-balance arguments to the crossed-beam reaction Ba(1S0)+HI(X 1Sigma+) -->BaI(X 2Sigma+) +H(2S1/2), a lower limit for the BaI bond dissociation energy is determined to be D<sup>0</sup><sub>0</sub>(BaI) >~76.8±1.7 kcal/mol (3.33±0.07 eV). Based on the upper bound of D<sup>0</sup><sub>0</sub>(BaI) <~78.5±0.5 kcal/mol, as determined from earlier predissociation studies [M. A. Johnson, J. Allison, and R. N. Zare, J. Chem. Phys. 85, 5723 (1986)], we recommend a BaI bond strength of 77.7±2.0 kcal/mol (3.37±0.09 eV). This dissociation energy is more than 5 kcal/mol higher than the previously accepted value of D<sup>0</sup><sub>0</sub>(BaI) as derived from mass spectrometric measurements. The Journal of Chemical Physics is copyrighted by The American Institute of Physics.
History: Received 30 August 1990; accepted 13 September 1990
Permalink: http://link.aip.org/link/?JCPSA6/93/8544/1
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KEYWORDS and PACS

Keywords
PACS
  • 34.50.Lf
    Atomic and molecular collision processes and interactions Inelastic scattering of atoms and molecules Chemical reactions, energy disposal, and angular distribution, as studied by atomic and molecular beams
  • 35.20.Gs
    Experimentally derived information on atoms and molecules; instrumentation and techniques Molecules Bond strengths, dissociation energies, hydrogen bonding, etc.
  • 82.40.Dm
    Physical chemistry Chemical kinetics and reactions: special regimes and techniques Atomic and molecular beam reactions
  • YEAR: 1990

PUBLICATION DATA

ISSN:
0021-9606 (print)   1089-7690 (online)
Publisher:
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REFERENCES (48)
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  1. A. G. Gaydon, Dissociation Energies and Spectra of Diatomic Molecules, 3rd ed. (Chapman and Hall, London, 1968).
  2. R. N. Zare, Ber. Bunsenges. Phys. Chem. 78, 153 (1974).
  3. P. H. Vaccaro, A. A. Tsekouras, D. Zhao, C. A. Leach, and R. N. Zare (in preparation).
  4. E. S. Rittner, J. Chem. Phys. 19, 1030 (1951).
  5. K. S. Krasnov and N. V. Karaseva, Opt. Spectrosc. 19, 14 (1965).
  6. C. A. Mims, S.-M. Lin, and R. R. Herm, J. Chem. Phys. 57, 3099 (1972).
  7. C. R. Dickson, J. B. Kinney, and R. N. Zare, Chem. Phys. 15, 243 (1976).
  8. R. C. Estler and R. N. Zare, Chem. Phys. 28, 253 (1978).
  9. P. D. Kleinschmidt and D. L. Hildenbrand, J. Chem. Phys. 68, 2819 (1978).
  10. D. L. Hildenbrand, J. Chem. Phys. 66, 3526 (1977).
  11. H. W. Cruse, P. J. Dagdigian, and R. N. Zare, Faraday Discuss. Chem. Soc. 55, 277 (1973).
  12. P. J. Dagdigian, H. W. Cruse, and R. N. Zare, Chem. Phys. 15, 249 (1976).
  13. M. A. Johnson, J. Allison, and R. N. Zare, J. Chem. Phys. 85, 5723 (1986).
  14. C. Noda, J. S. McKillop, M. A. Johnson, J. R. Waldeck, and R. N. Zare, J. Chem. Phys. 84, 856 (1986).
  15. C. Noda and R. N. Zare, J. Chem. Phys. 86, 3968 (1987).
  16. R. B. Bernstein and B. E. Wilcomb, J. Chem. Phys. 67, 5809 (1977).
  17. G. P. Smith, J. C. Whitehead, and R. N. Zare, J. Chem. Phys. 67, 4912 (1977).
  18. M. A. Johnson, C. W. Webster, and R. N. Zare, J. Chem. Phys. 75, 5575 (1981).
  19. M. A. Johnson, C. Noda, J. S. McKillop, and R. N. Zare, Can. J. Phys. 62, 1467 (1984);
    20. M. A. Johnson and R. N. Zare, J. Chem. Phys. 82, 4449 (1985).
  20. S. Datz, D. R. Herschbach, and E. H. Taylor, J. Chem. Phys. 35, 1549 (1961).
  21. K. P. Huber and G. Herzberg, Molecular Spectra and Molecular Structure. IV. Constants of Diatomic Molecules (Van Nostrand-Reinhold, New York, 1979).
  22. The potential surface governing the Ba+HI system is expected to exhibit an early barrier that channels most of the reaction exoergicity into product internal excitation rather than product recoil. See M. H. Mok and J. C. Polanyi, J. Chem. Phys. 51, 1451 (1969).
  23. A. Siegel and A. Schultz, J. Chem. Phys. 76, 4513 (1982).
  24. W. Braker and A. L. Mossman, Matheson Gas Data Book (Matheson Gas Products, Secaucus, N.J., 1980).
  25. C. T. Rettner, L. Wöste, and R. N. Zare, Chem. Phys. 58, 371 (1981).
  26. H. Hartmann and R. Schneider, Z. Anorg. Allgem. Chem. 180, 275 (1929);
    27. Ind. Eng. Chem. 39, 517 (1947);
    CRC Handbook of Chemistry and Physics (CRC, Boca Raton, 1984).
  27. S. Gerstenkorn and P. Luc, Atlas du Spectre d'Absorption de la Molecule d'lode (Centre National de la Recherche Scientifique, Paris, 1978);
    28. S. Gerstenkorn and P. Luc, Rev. Phys. Appl. 14, 791 (1979).
  28. D. J. Auerbach, in Atomic and Molecular Beam Methods, edited by G. Scoles (Oxford University, New York, 1988), Vol. 1.
  29. P. E. G. Baird, R. J. Brambley, K. Burnett, D. N. Stacey, D. M. Warrington, and G. K. Woodgate, Proc. R. Soc. London Ser. A 365, 567 (1979).
  30. W. Jitschin and G. Meisel, Z. Phys. A 295, 37 (1980).
  31. S. Niggli and M. C. E. Huber, Phys. Rev. A 39, 3924 (1989).
  32. C. J. Cannon, The Transfer of Spectral Line Radiation (Cambridge University, Cambridge, 1985).
  33. 56Ba138, the most prevalent isotope of barium at 71.66% natural abundance, has a nuclear spin of zero and, therefore, no hyperfine structure. While the largest peak in the Doppler-free spectra of Fig. 3 does correspond to 56Ba138, the contribution of other, less abundant isotopes has been grossly exaggerated by the detection geometry utilized in our LIF excitation scheme.
  34. U. Hefter and K. Bergmann, in Atomic and Molecular Beam Methods, edited by G. Scoles (Oxford University, New York, 1988), Vol. 1.
  35. D. W. Marquardt, J. Soc. Ind. Appl. Math. 11, 431 (1962).
  36. M. A. Johnson and R. N. Zare, J. Chem. Phys. 82, 4449 (1985).
  37. P. Mesnage, Ann. Phys. (Paris) 11, 5 (1939).
  38. M. M. Patel and N. R. Shah, Indian J. Pure Appl. Phys. 8, 681 (1970).
  39. W. E. Ernst, J. Kändler, C. Noda, J. S. McKillop, and R. N. Zare, J. Chem. Phys. 85, 3735 (1986).
  40. D. Zhao, P. H. Vaccaro, A. A. Tsekouras, C. A. Leach, and R. N. Zare (in preparation).
  41. P. J. Dagdigian, H. W. Cruse, and R. N. Zare, J. Chem. Phys. 60, 2330 (1974).
  42. T. Törring and K. Döbl, Chem. Phys. Lett. 115, 328 (1985).
  43. M. L. P. Rao, D. V. K. Rao, R. T. Rao, and P. S. Murty, Fizika 9, 25 (1977).
  44. The absence of “high-J” bandhead features in Fig. 6 has been demonstrated by seeding the HI reagent in helium carrier gas rather than nitrogen. The higher translational energies afforded by these experimental conditions permit direct identification and assignment of the P2(J) bandheads.
  45. The error bar placed on the HI bond dissociation energy reflects the spread of D<sub>0</sub><sup>0</sup> (HI) values calculated from various thermochemical measurements.
  46. C. E. Moore, Atomic Energy Levels (National Bureau of Standards, Washington, D.C., 1971), Vol. 3.
  47. Z. Karny and R. N. Zare, J. Chem. Phys. 68, 3360 (1978).
  48. D. L. Hildenbrand (private communication).

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