Artículos de revistas
Electronic Excitation Of H2 By Positron Impact
Registro en:
Physical Review A - Atomic, Molecular, And Optical Physics. , v. 74, n. 4, p. - , 2006.
10502947
10.1103/PhysRevA.74.042713
2-s2.0-33750023185
Autor
Arretche F.
Lima M.A.P.
Institución
Resumen
Recent experiments on electronic excitation of molecules by positron impact have shown much larger cross sections than in the electron scattering case. The challenge of understanding the origin of this enhancement, especially just above electronic excitation thresholds, motivates the search of theoretical explanations of the phenomenon as well as new experimental efforts to confirm the data. In an earlier theoretical effort, an application of the Schwinger multichannel method at two-state level of approximation for the X Σg+1 â†B Σu+1 electronic excitation of the H2 molecule, gave cross sections with smaller magnitude but reasonable qualitative agreement with the experimental data. The purpose of this work was to study the numerical stability of the previous calculation and to investigate the influence of open channels (energetically accessible electronic statesâ€"multichannel effects) and closed channels (energetically inaccessible electronic statesâ€"polarization effects) on this transition. Our results show minor multichannel effects and a significative enhancement of the X Σg+1 â†'B Σu+1 cross section at the threshold due to polarization effects if compared to the usual static results. © 2006 The American Physical Society. 74 4
Makkonen, I., Hakala, M., Puska, M.J., (2006) Phys. Rev. B, 73, p. 035103. , PRBMDO 0163-1829 10.1103/PhysRevB.73.035103 Guessoum, N., Jean, P., Gillard, W., (2005) Astron. Astrophys., 436, p. 171. , AAEJAF 0004-6361 10.1051/0004-6361:20042454 Surko, C.M., Gribakin, G.F., Buckman, S.J., (2005) J. Phys. B, 38, p. 57. , JPAPEH 0953-4075 10.1088/0953-4075/38/6/R01 Murphy, T.J., Surko, C.M., (1992) Phys. Rev. A, 46, p. 5696. , PLRAAN 1050-2947 10.1103/PhysRevA.46.5696 Sueoka, O., (1982) J. Phys. Soc. Jpn., 51, p. 3757. , JUPSAU 0031-9015 10.1143/JPSJ.51.3757 Coleman, P.G., Hutton, J.T., Cook, D.R., Chandler, C.A., (1982) Can. J. Phys., 60, p. 584. , CJPHAD 0008-4204 Mori, S., Sueoka, O., (1994) J. Phys. B, 27, p. 4349. , JPAPEH 0953-4075 10.1088/0953-4075/27/18/028 Sueoka, O., Jin, B., Hamada, A., (1995) Appl. Surf. Sci., 85, p. 59. , ASUSEE 0169-4332 Chaudhuri, P., Adhikari, S.K., (1998) Phys. Rev. A, 57, p. 984. , PLRAAN 1050-2947 10.1103/PhysRevA.57.984 Chaudhuri, P., Adhikari, S.K., (1998) Nucl. Phys. A, 631, pp. 715C. , NUPABL 0375-9474 Chaudhuri, P., Adhikari, S.K., (1999) J. Phys. B, 31, p. 3057. , JPAPEH 0953-4075 10.1088/0953-4075/31/13/022 Chaudhuri, P., Adhikari, S.K., (1999) J. Phys. B, 32, p. 129. , JPAPEH 0953-4075 Parcell, L.A., McEachran, R.P., Stauffer, A.D., (1998) Nucl. Instrum. Methods Phys. Res. B, 143, p. 37. , NIMBEU 0168-583X Parcell, L.A., McEachran, R.P., Stauffer, A.D., (2000) Nucl. Instrum. Methods Phys. Res. B, 171, p. 113. , NIMBEU 0168-583X 10.1016/S0168-583X(00)00061-6 Sullivan, J.P., Marler, J.P., Gilbert, S.J., Buckman, S.J., Surko, C.M., (2001) Phys. Rev. Lett., 87, p. 073201. , PRLTAO 0031-9007 10.1103/PhysRevLett.87.073201 Mukherjee, T., Sur, S., Ghosh, A.S., (1991) J. Phys. B, 24, p. 1449. , JPAPEH 0953-4075 10.1088/0953-4075/24/6/028 Mukherjee, M., Mukherjee, T., Ghosh, A.S., (1991) J. Phys. B, 24, p. 463. , JPAPEH 0953-4075 10.1088/0953-4075/24/18/006 Ghosh, A.S., Mukherjee, T., (1994) Hyperfine Interact., 89, p. 299. , HYINDN 0304-3843 10.1007/BF02064514 Lino, J.L.S., Germano, J.S.E., Lima, M.A.P., (1994) J. Phys. B, 27, p. 1881. , JPAPEH 0953-4075 10.1088/0953-4075/27/9/023 Chaudhuri, P., Varella, M.T.D., De Carvalho, C.R.C., Lima, M.A.P., (2004) Nucl. Instrum. Methods Phys. Res. B, 221, p. 69. , NIMBEU 0168-583X 10.1016/j.nimb.2004.03.033 Chaudhuri, P., Varella, M.T.D., De Carvalho, C.R.C., Lima, M.A.P., (2004) Phys. Rev. A, 69, p. 042703. , PLRAAN 1050-2947 10.1103/PhysRevA.69.042703 Marler, J.P., Surko, C.M., (2005) Phys. Rev. A, 72, p. 062713. , PLRAAN 1050-2947 10.1103/PhysRevA.72.062713 Da Silva, E.P., Varella, M.T.D., Lima, M.A.P., (2005) Phys. Rev. A, 72, p. 062715. , PLRAAN 1050-2947 10.1103/PhysRevA.72.062715 Takatsuka, K., McKoy, V., (1981) Phys. Rev. A, 24, p. 2473. , PLRAAN 1050-2947 10.1103/PhysRevA.24.2473 Takatsuka, K., McKoy, V., (1984) Phys. Rev. A, 30, p. 1734. , PLRAAN 1050-2947 10.1103/PhysRevA.30.1734 Germano, J.S.E., Lima, M.A.P., (1993) Phys. Rev. A, 47, p. 3976. , PLRAAN 1050-2947 10.1103/PhysRevA.47.3976 MacHado, A.M., Taveira, A.M.A., Brescansin, L.M., Lee, M.-T., (2001) THEOCHEM, 574, p. 133. , THEODJ 0166-1280 Dunning, T.H., (1970) J. Chem. Phys., 53, p. 2823. , JCPSA6 0021-9606 10.1063/1.1674408 Huzinaga, S., Kolbukowski, M., (1993) Chem. Phys. Lett., 212, p. 260. , CHPLBC 0009-2614 10.1016/0009-2614(93)89323-A Carsky, P., Hrouda, V., Michl, J., (1995) Int. J. Quantum Chem., 53, p. 419. , IJQCB2 0020-7608 10.1002/qua.560530408 Carsky, P., Hrouda, V., Michl, J., (1995) Int. J. Quantum Chem., 53, p. 431. , IJQCB2 0020-7608 Carsky, P., Hrouda, V., Michl, J., Antic, D., (1995) Int. J. Quantum Chem., 53, p. 437. , IJQCB2 0020-7608 Fraser, P.A., (1968) Adv. At. Mol. Phys., 4, p. 63. , AAMOA2 0065-2199 Gibson, T.L., Lima, M.A.P., McKoy, V., Huo, W.M., (1987) Phys. Rev. A, 35, p. 2473. , PLRAAN 1050-2947 10.1103/PhysRevA.35.2473 Gibson, T.L., Lima, M.A.P., Takatsuka, K., McKoy, V., (1984) Phys. Rev. A, 30, p. 3005. , PLRAAN 1050-2947 10.1103/PhysRevA.30.3005 Lima, M.A.P., Gibson, T.L., Takatsuka, K., McKoy, V., (1984) Phys. Rev. A, 30, p. 1741. , PLRAAN 1050-2947 10.1103/PhysRevA.30.1741 Da Costa, R.F., Da Paixão, F.J., Lima, M.A.P., (2004) J. Phys. B, 37, p. 129. , JPAPEH. 0953-4075. 10.1088/0953-4075/37/6/L03 Da Costa, R.F., Da Paixão, F.J., Lima, M.A.P., (2005) J. Phys. B, 38, p. 4363. , JPAPEH. 0953-4075. 10.1088/0953-4075/38/24/003 Hunt, W.J., Goddard Iii, W.A., (1969) Chem. Phys. Lett., 3, p. 414. , CHPLBC 0009-2614 10.1016/S0009-2614(99)00340-1 Branchett, S.E., Tennyson, J., (1990) Phys. Rev. Lett., 64, p. 2889. , PRLTAO 0031-9007 10.1103/PhysRevLett.64.2889 Kolos, W., Rychlewski, J., (1977) J. Mol. Spectrosc., 66, p. 428. , JMOSA3 0022-2852 10.1016/0022-2852(77)90301-0 Rothenberg, S., Davidson, E.R., (1966) J. Chem. Phys., 44, p. 730. , JCPSA6 0021-9606 10.1063/1.1726753 Sharp, T.E., (1971) At. Data, 2, p. 119. , ATDAAE 0004-7082 Gibson, T.L., Lima, M.A.P., Takatsuka, K., McKoy, V., (1984) Phys. Rev. A, 30, p. 3005. , PLRAAN 1050-2947 10.1103/PhysRevA.41.327 Lima, M.A.P., Gibson, T.L., Takatsuka, K., McKoy, V., (1984) Phys. Rev. A, 30, p. 1741. , PLRAAN 1050-2947 10.1103/PhysRevA.41.327 Lima, M.A.P., Brescansin, L.M., Da Silva, A.J.R., Winstead, C., McKoy, V., (1990) Phys. Rev. A, 41, p. 327. , PLRAAN 1050-2947 10.1103/PhysRevA.41.327 Rescigno, T.N., private communicationLino, J.L.S., Germano, J.S.E., Da Silva, E.P., Lima, M.A.P., (1998) Phys. Rev. A, 58, p. 3502. , PLRAAN 1050-2947 10.1103/PhysRevA.58.3502