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Generation of an intense molecular beam of CO2 by a gasdynamic method

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Abstract

The idea of using the core of a jet of expanding gas to form a molecular beam has led to the construction of complex gasdynamic facilities and has prescribed a number of specific requirements for the creation of high-intensity molecular beams. Two basic requirements are high pumping speed and a skimmer, the first element in the beam-generating system, which does not react appreciably on the jet. The present article gives the results of an experimental investigation of conditions for creating a molecular beam from a jet of carbon dioxide downstream of a sonic nozzle. The position of maximum intensity with room temperature gas in the source is given by the group of variables (P0 d*)0.4. Kn. By measuring the intensity and by mass-spectrometric analysis of a molecular beam for specific conditions we have established the CO2 pressure in the stagnation chamber at which condensation begins. The investigations were carried out in a molecular-beam generator with cryogenic pumping.

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Literature cited

  1. 1.

    K. Bier and O. Hagena, “Influence of shock waves on generation of high-intensity molecular beams by nozzles,” in: Proceedings of the Third International Symposium on Rarefied Gas Dynamics, Vol. 1, Academic Press, New York-London (1963), p. 478.

  2. 2.

    G. T. Skinner and J. Moyzis, “Experimental study of the collimation problem in a high-intensity molecular beam,” Phys. Fluids,8, No. 3, 452 (1965).

  3. 3.

    K. Bier and O. Hagena, “Optimum conditions for generating supersonic molecular beams,” in: Proceedings of the Fourth International Symposium on Rarefied Gas Dynamics, Vol. 2, Academic Press, New York-London (1966).

  4. 4.

    G. E. McMichael and G. B. French, “Electron beam studies of skimmer interaction in a free jet,” Phys. Fluids,9, No. 7, 1419 (1966).

  5. 5.

    Skofronik, “Intense beam source with a nozzle for measurement of molecular-collision total cross sections,” PNI, No. 1 (1967).

  6. 6.

    U. Bossel, F. C. Hurlbut, and F. S. Sherman, “Extraction of molecular beams from nearly inviscid hypersonic free jets,” in: Proceedings of the Sixth International Symposium on Rarefied Gas Dynamics, Vol. 2, Academic Press, New York-London (1966), p. 945.

  7. 7.

    U. Bossel, “On the optimization of skimmer geometry,” Entropie, No. 42, 12 (1971).

  8. 8.

    J. B. Fenn and J. B. Anderson, “Background and sampling effects in free jet studies by molecular beam measurements,” in: Proceedings of the Fourth International Symposiom on Rarefied Gas Dynamics, Vol. 2, Academic Press, New York-London (1966), p. 311.

  9. 9.

    R. F. Brown and J. H. Heald, “Background gas scattering and skimmer interaction studies using a cryogenically pumped molecular beam generator,” in: Proceedings of the Fifth International Symposium on Rarefied Gas Dynamics, Vol. 2, Academic Press, New York-London (1967), p. 1407.

  10. 10.

    T. R. Covers, R. L. Leroy, and J. M. Deckers, “The concurrent effects of skimmer interactions and background scattering on the intensity of a supersonic molecular beam,” in: Proceedings of the Sixth International Symposium on Rarefied Gas Dynamics, Vol. 2, Academic Press, New York-London (1969), p. 985.

  11. 11.

    R. Campargue, “Dimensionless number linked to background and skimmer jet interaction in nozzle beam generation,” in: Proceedings of the Sixth International Symposium on Rarefied Gas Dynamics, Vol. 2, Academic Press, New York-London (1969), p. 1003.

  12. 12.

    A. A. Vostrikov, Yu. S. Kusner, A. K. Rebrov, and B. E. Semyachkin, “A molecular-beam generator,” in: Experimental Methods in Rarefied Gasdynamics [in Russian] (edited by S. S. Kutateladze), Novosibirsk (1974).

  13. 13.

    E. G. Velikanov, A. A. Vostrikov, L. V. Vydrin, A. K. Rebrov, and B. E. Semyachkin, “A molecular-beam generator with cobined pumping,” in: Proceedings of the Fifth A11-Union Conference on Vacuum Technology [in Russian], Kazan (1972).

  14. 14.

    H. M. Parker, R. N. Zapata, and J. E. Scott, “The use of supersonic beam sources in investigations at low density and high speed,” in: Rarefied Gas Dynamics [Russian translation], Inostr. Lit., Moscow (1963).

  15. 15.

    A. F. Beylieh, “Experimental investigation of carbon dioxide jet plumes,” Phys. Fluids,14, No. 5, 898 (1971).

  16. 16.

    G. Potter, G. Arney, M. Kinslow, and V. Garden, “Gasdynamic diagnostics of high-speed flow expanded from plasma states,” IEEE Trans. Nucl. Sci., No. 1 145 (1964).

  17. 17.

    S. Dushman, Scientific Basis of Vacuum Technology [Russian translation] Mir, Moscow (1974).

  18. 18.

    H. Ashkenas and F. S. Sherman, “The structure and utilization of supersonic free jets in low-density wind tunnels,” Proceedings of the Fourth International Symposium on Rarefied Gas Dymamics, Vol. 2, Academic Press, New York-London (1966), p. 84.

  19. 19.

    J. S. Draper and J. A. F. Hill, “Rarefaction in underexpanded flows,” AIAA J., 7, No. 7 (1969).

  20. 20.

    P. V. Marrone, “Temperature and density measurements in free jets and shock waves,” Phys. Fluids,10, No. 3, 521 (1967).

  21. 21.

    Y. Nakamura, “Temperature and densitymeasurementsof induction-heated free jets of N2 and N2-seeded Ar,” University Southern California, No. 116 (1970).

  22. 22.

    N. I. Kislyakov, A. K. Rebrov, and R. G. Sharafutdinov, “Diffusion processes in the zone of a low-density supersonic jet,” Zh. Prikl. Mekh. Tekh. Fiz., No. 1 (1973).

  23. 23.

    E. W. Becker, K. Bier, and W. Henkes, Strahlen aus Kondensierten Atomen und Molekeln im Hochvakuum, Z. Physik,146. No. 3, 333 (1956).

  24. 24.

    R. Klingelhofer and H. O. Moser, “Production of large hydrogen clusters in condensed molecular beams,” J. Appl. Phys.,43, No. 11, 4575 (1972).

  25. 25.

    D. Golomb, R. E. Good, A. B. Bailey, M. R. Busby, and R. Dawbarn, “Dimers, clusters, and condensation in free jets,” J. Chem. Phys.,57, No. 9, 3844 (1972).

  26. 26.

    L. M. Davydov, “Investigation of nonequilibrium condensation in supersonic nozzles and jets,” Izv. Akad. Nauk SSSR, Mekh. Zhidk. Gaza, No. 3 (1971).

  27. 27.

    O. F. Hagena and W. Obert, “Cluster formation in expanding jets: effect of pressure, temperature, test gas, and nozzle size,” J. Chem. Phys.,56, No. 5, 1793 (1973).

  28. 28.

    J. L. Griffin and P. M. Sherman, “Computer analysis of condensation in highly expanded flows,” AIAA J.,3, No. 10 (1965).

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Translated from Zhurnal Prikladnoi Mekhaniki i Tekhnicheskoi Fiziki, No. 2, pp. 34–41, March–April, 1975.

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Vostrikov, A.A., Kusner, Y.S., Rebrov, A.K. et al. Generation of an intense molecular beam of CO2 by a gasdynamic method. J Appl Mech Tech Phys 16, 180–186 (1975). https://doi.org/10.1007/BF00858911

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Keywords

  • Dioxide
  • Mathematical Modeling
  • Carbon Dioxide
  • Mechanical Engineer
  • Experimental Investigation