Abstract
This paper reports results from an experiment designed to measure the nascent rovibrational population of H2 molecules that have formed through the heterogeneous recombination of H atoms on the surface of cosmic dust analogues under conditions approaching those of the interstellar medium (ISM). H2 that has formed on a highly oriented pyrolytic graphite (HOPG) surface has been detected, using laser induced resonance-enhanced multi-photon ionization (REMPI), in the v = 1 (J= 0–3) rovibrational states at surface temperatures of 30 K and 50 K. These excited product molecules display rotational temperatures significantly higher than the target surface temperature. These first results suggest that a considerable proportion of the binding energy released on formation of the H2 is deposited in the surface, in addition to internal excitation of the product molecules.
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Biham, O., Furman, I., Katz, N., Pirronello, V. and Vidali, G.: 1998, MNRAS 296, 869.
Farebrother, A.J., Meijer, A.J.H.M., Clary, D.C. and Fisher, A.J.: 2000, Chem. Phys. Lett. 319, 303
Ghio, E., Mattera, C., Salvo, C., Tommasini, F. and Valbusa, U.: 1980, J. Chem. Phys. 73, 556.
Gough, S., Schermann, C., Pichou, F., Landau, M., Cadez, I. and Hall, R.I.: 1996, Astron. Astrophys. 305, 687.
Gould, R.J. and Salpeter, E.E.: 1963, Astrophys. J. 138, 393.
Hollenbach, D. and Salpeter, E.E.: 1970, J. Chem. Phys. 53, 79.
Hollenbach, D. and Salpeter, E.E.: 1971, Astrophys. J. 163, 155.
Hollenbach, D., Werner, M.W. and Salpeter, E.E.: 1971, Astrophys. J. 163, 165.
Jeloaica, L. and Sidis, V.: 1999, Chem. Phys. Lett. 300, 157.
Katz, N., Furman, I., Biham, O., Pirronello, V. and Vidali, G.: 1999, Astrophys. J. 522, 305.
Manico, G., Raguni, G., Pirronello, V., Roser, J.E. and Vidali, G.: 2001, Astrophys. J. 548, L253.
Mathis, J.S.: 1990, Annu. Rev. Astron. Astrophys. 28, 37.
Meijer, A.J.H.M., Farebrother, A.J., Clary, D.C. and Fisher, A.J.: 2001, J. Phys. Chem. A 105, 2173.
Papoular, R., Conard, J., Guillois, O., Nenner, I., Reynaud, C. and Rouzaud, J.N.: 1996, Astron. Astrophys. 315, 222.
Perry, J.S.A., Gingell, J.M., Newson, K.A., To, J., Watanabe, N. and Price, S.D.: 2002, Meas. Sci. Technol. 13, 1414.
Pirronello, V., Liu, C., Shen, L.Y. and Vidali, G.: 1997a, Astrophys. J. 475, L69.
Pirronello, V., Biham, O., Liu, C., Shen, L.O. and Vidali, G.: 1997b, Astrophys. J. 483, L131.
Pirronello, V., Liu, C., Roser, J.E. and Vidali, G.: 1999, Astron. Astrophys. 344, 681.
Rutigliano, M., Cacciatore, M. and Billing, G.D.: 2001, Chem. Phys. Lett. 340, 13.
Sandford, S.A., Allamandola, L.J. and Geballe, T.R.: 1993, Science 262, 400.
Sha, X.W. and Jackson, B.: 2002, Surf. Sci. 496, 318.
Takahashi, J., Masuda, K. and Nagaoka, M.: 1999a, MNRAS 306, 22.
Takahashi, J., Masuda, K. and Nagaoka, M.: 1999b, Astrophys. J. 520, 724.
Walraven, J.T.M. and Silvera, I.F.: 1982, Rev. Sci. Instrum. 53, 1167.
Williams, D.A.: 1968, Astrophys. J. 151, 935.
Williams, D.A. and Hartquist, T.W.: 1999, Accounts Chem. Res. 32, 334.
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Perry, J., Price, S. Detection of rovibrationally excited H2 formed through the heterogeneous recombination of H atoms on a cold HOPG surface. Astrophysics and Space Science 285, 769–776 (2003). https://doi.org/10.1023/A:1026181815008
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DOI: https://doi.org/10.1023/A:1026181815008