Journal of Chemical Physics
Feedback | Help | Exit
The Journal of Chemical Physics
   
 
 
 
Previous Article
Reaction dynamics from orbital alignment dependence and angular distributions of ions produced in collision of Ba(1P) with NO2 and O3
Angular distributions, orbital alignment dependence, and energy dependence of the relative cross sections of various ions produced in crossed beams collisions of electronically excited barium with O3 ...
Next Article
Theoretical studies of the reactivity and spectroscopy of H+CO=HCO. I. Stabilization and scattering studies of resonances for J=0 on the Harding ab initio surface
We report stabilization and coupled-channel scattering calculations of isolated resonances for a triatomic molecule HCO using a global, ab initio potential energy surface. The lowest nine resonances a...

Experimental determination of the specific opacity function for the Ba+HI-->BaI(v=0)+H reaction

J. Chem. Phys. 96, 2786 (1992); doi:10.1063/1.462027

Issue Date: 15 February 1992

You are not logged in to this journal. Log in

Patrick H. Vaccaro, Athanassios A. Tsekouras, Daqing Zhao, Christine A. Leach, and Richard N. Zare
Department of Chemistry, Stanford University, Stanford, California 94305-5080
Through the use of laser-induced fluorescence spectroscopy, product rotational population distributions were recorded for the Ba(1S0)+HI(X 1Sigma+)-->BaI(X2 Sigma+,v=0)+H(2S1/2) reaction under well-defined, crossed-beam conditions. In this kinematically constrained reaction, orbital angular momentum of the reagents Lreag is channeled almost exclusively into rotational angular momentum of the products Jprod. Consequently, ||Jprod||[approximately-equal-to]µvrelb, where µ is the reduced mass of the reactants, vrel is their relative velocity, and b is the impact parameter of the reactive collision. For relative velocity distributions with mean values ranging from 860 to 1000 m s−1, the BaI v=0 rotational distributions were found to peak sharply at high J values (>~420). Nonlinear least-squares analysis showed the specific opacity function (impact parameter distribution) for the formation of vibrationless BaI product to be exceptionally narrow (~0.3 Å FWHM) with a pronounced maximum at the highest energetically allowed impact parameter ~4.5 Å. The Journal of Chemical Physics is copyrighted by The American Institute of Physics.
History: Received 16 September 1991; accepted 5 November 1991
Permalink: http://link.aip.org/link/?JCPSA6/96/2786/1
BUY THIS ARTICLE   (US$28)
Download PDF (1773 kB) View Cart

KEYWORDS and PACS

Keywords
PACS
  • 82.30.Hk
    Physical chemistry Specific chemical reactions; reaction mechanisms Chemical exchanges (substitution, atom transfer, abstraction, disproportionation, and group exchange)
  • 82.20.Hf
    Physical chemistry Chemical kinetics Mechanisms and product distribution
  • 82.40.Dm
    Physical chemistry Chemical kinetics and reactions: special regimes and techniques Atomic and molecular beam reactions
  • YEAR: 1992

RELATED DATABASES


To view database links for this article,
you need to log in.
To view database links for this article,
you need to log in.

PUBLICATION DATA

ISSN:
0021-9606 (print)   1089-7690 (online)
Publisher:
AIP is a member of CrossRef AIP

REFERENCES (42)
View in Separate Window/Tab
For access to fully linked references, you need to log in. For access to fully linked references, you need to Log in.
  1. R. D. Levine and R. B. Bernstein, Molecular Reaction Dynamics and Chemical Reactivity (Oxford University, New York, 1987).
  2. D. J. Rakestraw, K. G. McKendrick, and R. N. Zare, J. Chem. Phys. 87, 7341 (1987);
    3. R. Zhang, D. J. Rakestraw, K. G. McKendrick, and R. N. Zare, ibid. 89, 6283 (1988);
    R. Zhang, W. J. van der Zande, M. J. Bronikowski, and R. N. Zare, ibid. 94, 2704 (1991).
  3. D. M. Neumark, A. M. Wodtke, G. N. Robinson, C. C. Hayden, and Y. T. Lee, J. Chem. Phys. 82, 3045 (1985);
    4. D. M. Neumark, A. M. Wodtke, G. N. Robinson, C. C. Hayden, K. Shobatake, R. K. Sparks, T. P. Schafer, and Y. T. Lee, ibid. 82, 3067 (1985).
  4. R. B. Bernstein and A. H. Zewail, J. Chem. Phys. 90, 829 (1989);
    5. M. Dantus, M. J. Rosker, and A. H. Zewail, ibid. 89, 6128 (1988);
    A. H. Zewail, Science 242, 1645 (1988);
    M. J. Rosker, M. Dantus, and A. H. Zewail, ibid. 241, 1200 (1988);
    M. Dantus, M. J. Rosker, and A. H. Zewail, J. Chem. Phys. 87, 2395 (1987).
  5. P. R. Brooks, Chem. Rev. 88, 407 (1988);
    6. T. C. Maguire, P. R. Brooks, R. F. Curl, J. H. Spence, and S. J. Ulvick, J. Chem. Phys. 85, 844 (1986);
    T. C. Maguire, P. R. Brooks, and R. F. Curl, Phys. Rev. Lett. 50, 1918 (1983).
  6. I. W. M. Smith, Kinetics and Dynamics of Elementary Gas Phase Reactions (Butterworths, London, 1980).
  7. D. R. Herschbach, Faraday Discuss. Chem. Soc. 33, 281 (1962);
    8. D. R. Herschbach, Adv. Chem. Phys. 10, 319 (1966).
  8. C. Noda, J. S. McKillop, M. A. Johnson, J. R. Waldeck, and R. N. Zare, J. Chem. Phys. 85, 856 (1986).
  9. C. Noda and R. N. Zare, J. Chem. Phys. 86, 3968 (1987).
  10. P. R. Brooks, Science 193, 11 (1976);
    11. G. Marcelin and P. R. Brooks, J. Am. Chem. Soc. 95, 7885 (1973);
    E. M. Jones and P. R. Brooks, J. Chem. Phys. 53, 55 (1970);
    P. R. Brooks, E. M. Jones, and K. Smith, ibid. 51, 3073 (1969).
  11. S. R. Gandhi, Q.-X. Xu, T. J. Curtiss, and R. B. Bernstein, J. Phys. Chem. 91, 5437 (1987);
    12. S. R. Gandhi, T. J. Curtiss, Q.-X. Xu, S. E. Choi, and R. B. Bernstein, Chem. Phys. Lett. 132, 6 (1986);
    K. K. Chakravorty, D. H. Parker, and R. B. Bernstein, Chem. Phys. 68, 1 (1982).
  12. B. Friedrich and D. R. Herschbach, Nature (London) 353, 412 (1991).
  13. R. N. Zare, Ber. Bunsenges. Phys. Chem. 86, 422 (1982).
  14. M. Hoffmeister, R. Schleysing, and H. Loesch, J. Phys. Chem. 91, 5441 (1987).
  15. C. T. Rettner and R. N. Zare, J. Chem. Phys. 77, 2416 (1982);
    16. 75, 3636 (1981).
  16. The most prevalent isotope of barium, 18Ba, has an intrinsic nuclear spin angular momentum of zero [I(138Ba) = 0]. The BaI molecules observed in the present study are believed to originate exclusively from the reactive scattering of this isotope with HI. Justification for this presumption can be found both in the 71.66% natural abundance of138Ba and in the detailed analysis of hyperfine structure for the nascent BaI(X2Sigma+) product.
  17. The single naturally occurring isotope of iodine, 127I, has an intrinsic nuclear spin of 5/2[I(127I) = 5/2], which manifests itself as hyperfine splittings on individual rovibronic transitions of iodine-containing molecules. While such hyperfine interactions can be observed readily in the nascent BaI product and are presumed to exist in the HI reactant, the small magnitude of I(127I) suggests that it can be neglected for the present kinematic analysis.
  18. K. P. Huber and G. Herzberg, Molecular Spectra and Molecular Structure. IV. Constants of Diatomic Molecules (Van Nostrand Reinhold, New York, 1979).
  19. G. Herzberg, Molecular Spectra and Molecular Structure. I. Spectra of Diatomic Molecules (Van Nostrand Reinhold, New York, 1950).
  20. T. Töning and K. Döbl, Chem. Phys. Lett. 115, 328 (1985).
  21. H. W. Cruse, P. J. Dagdigian, and R. N. Zare, Faraday Discuss. Chem. Soc. 55, 277 (1973);
    22. C. A. Mims, S.-M. Lin, and R. R. Herm, J. Chem. Phys. 57, 3099 (1972).
  22. The potential energy hypersurface for theBa+HI reaction system is expected to exhibit an early barrier that channels most of the exoergicity into product internal excitation rather than product recoil. See, for example, M. H. Mok and J. C. Polanyi, J. Chem. Phys. 51, 1451 (1969).
  23. P. H. Vaccaro, D. Zhao, A. A. Tsekouras, C. A. Leach, W. E. Ernst, and R. N. Zare, J. Chem. Phys. 93, 8544 (1990).
  24. A. Siegel and A. Schultz, J. Chem. Phys. 76, 4513 (1982).
  25. D. Zhao and R. N. Zare (unpublished results).
  26. N. H. Hijazi and K. J. Laider, J. Chem. Phys. 58, 349 (1973).
  27. J. O. Hirschfelder, Int. J. Quantum Chem. 3, 17 (1969).
  28. J. Vigué, P. Grangier, and A. Aspect, Phys. Rev. A 30, 3317 (1984);
    29. H. K. Haugen, E. Weitz, and S. R. Leone, J. Chem. Phys. 83, 3402 (1985).
  29. M. A. Johnson, C. Noda, J. S. McKillop, and R. N. Zare, Can. J. Phys. 62, 1467 (1984).
  30. M. M. Patel and N. R. Shah, Indian J. Pure Appl. Phys. 8, 681 (1970);
    31. P. Mesnage, Ann. Phys. (Paris) 12, 5 (1939).
  31. D. Zhao, P. H. Vaccaro, A. A. Tsekouras, C. A. Leach, and R. N. Zare, J. Mol. Spectrosc. 148, 226 (1991).
  32. P. J. Dagdigian, H. W. Cruse, and R. N. Zare, J. Chem. Phys. 60, 2330 (1974).
  33. M. L. P. Rao, D. V. K. Rao, P. T. Rao, and P. S. Murty, Fizika 9, 25 (1977).
  34. M. A. Johnson and R. N. Zare, J. Chem. Phys. 82, 4449 (1985).
  35. M. A. Johnson, C. R. Webster, and R. N. Zare, J. Chem. Phys. 75, 5575 (1981).
  36. C. A. Leach, J. R. Waldeck, C. Noda, J. S. McKillop, and R. N. Zare, J. Mol. Spectrosc. 146, 465 (1991).
  37. R.N. Zare, Angular Momentum: Understanding Spatial Aspects in Chemistry and Physics (Wiley, New York, 1988).
  38. W. E. Ernst, J. Kändler, C. Noda, J. S. McKillop, and R. N. Zare, J. Chem. Phys. 85, 3735 (1986);
    39. C. A. Leach, W. E. Ernst, J. Kändler, C. Noda, J. S. McKillop, and R. N. Zare ibid. 95, 9433 (1991).
  39. S. Datz, D. R. Herschbach, and E. H. Taylor, J. Chem. Phys. 35, 1549 (1961).
  40. C. A. Leach, A. A. Tsekouras, P. H. Vaccaro, R. N. Zare, and D. Zhao, Faraday Discuss. Chem. Soc. 91 (in press).
  41. M. A. Johnson, J. Allison, and R. N. Zare, J. Chem. Phys. 85, 5723 (1986).
  42. D. L. Hildenbrand and K. H. Lau, J. Chem. Phys. (in press).

CITING ARTICLES
For access to citing articles, you need to log in.
For access to citing articles, you need to Log in.


Copyright © American Institute of Physics