Comparative Study Of Electron And Positron Scattering By H2: The Role Of The Σg+2 Feshbach Resonance

We report two-channel calculations for e± - H2 scattering (X Σg+1 →X Σg+1, B Σu+3 for electrons and X Σg+1 →X Σg+1, B Σu+1 for positrons). We provide independent estimates of the electron Σg+2 Feshbach resonance (though for a limited range of interatomic distances) in good agreement with benchmark calculations. Resonance enhanced vibrational excitation cross sections were obtained with a time-dependent local complex potential approach and compare favorably with recent calculations and experimental data. The time resolution also provides good physical insight into the transient dynamics. In a previous work, we predicted the existence of a positron-hydrogen Σg+2 Feshbach resonance based on a fixed-nuclei scattering calculation (equilibrium geometry) that was not observed experimentally. We further investigate the resonance potential in this study and our results indicate that the Σg+2 potential crosses the B Σu+1 state just above the equilibrium interatomic distance of the ground state, giving rise to a short-lived transient. Though the positronium formation channel could also play a role, the state crossing sheds light on the controversy between theory and experiment. © 2008 The American Physical Society.784Schulz, G.J., (1973) Rev. Mod. Phys., 45, p. 423. , 10.1103/RevModPhys.45.423Grill, A., (1994) Cold Plasma Materials Fabrication: From Fundamentals to Applications, , IEEE Press, New YorkBoudaïffa, B., Cloutier, P., Hunting, D., Huels, M.A., Sanche, L., (2000) Science, 287, p. 1658. , 10.1126/science.287.5458.1658Pan, X., Cloutier, P., Hunting, D., Sanche, L., (2003) Phys. Rev. Lett., 90, p. 208102. , 10.1103/PhysRevLett.90.208102De Carvalho, C.R.C., Varella Do N, M.T., Lima, M.A.P., Da Silva, E.P., (2003) Phys. Rev. A, 68, p. 062706. , 10.1103/PhysRevA.68.062706Do Varella, N.M.T., De Oliveira, E.M., Lima, M.A.P., (2008) Nucl. Instrum. Methods Phys. Res. B, 266, p. 435. , 10.1016/j.nimb.2007.12.020Gribakin, G.F., (2002) Nucl. Instrum. Methods Phys. Res. B, 192, p. 26. , 10.1016/S0168-583X(02)00702-4Gribakin, G.F., Lee, C.M.R., (2006) Phys. Rev. Lett., 97, p. 193201. , 10.1103/PhysRevLett.97.193201Gilbert, S.J., Barnes, L.D., Sullivan, J.P., Surko, C.M., (2002) Phys. Rev. Lett., 88, p. 043201. , 10.1103/PhysRevLett.88.043201Barnes, L.D., Gilbert, S.J., Surko, C.M., (2003) Phys. Rev. A, 67, p. 032706. , 10.1103/PhysRevA.67.032706Bromley, M.W.J., Mitroy, J., (2006) Phys. Rev. Lett., 97, p. 183402. , 10.1103/PhysRevLett.97.183402Mitroy, J., Bromley, M.W.J., (2007) Phys. Rev. Lett., 98, p. 173001. , 10.1103/PhysRevLett.98.173001Comer, J., Read, F.H., (1971) J. Phys. B, 4, p. 368. , 10.1088/0022-3700/4/3/009Joyez, G., Comer, J., Read, F.H., (1973) J. Phys. B, 6, p. 2427. , 10.1088/0022-3700/6/11/038Stibbe, D.T., Tennyson, J., (1997) Phys. Rev. Lett., 79, p. 4116. , 10.1103/PhysRevLett.79.4116Stibbe, D.T., Tennyson, J., (1997) J. Phys. B, 30, p. 301. , 10.1088/0953-4075/30/9/003Stibbe, D.T., Tennyson, J., (1998) J. Phys. B, 31, p. 815. , 10.1088/0953-4075/31/4/027Celiberto, R., Janev, R.K., Wadehra, J.M., Laricchiuta, A., (2008) Phys. Rev. A, 77, p. 012714. , 10.1103/PhysRevA.77.012714Da Silva, A.J.R., Lima, M.A.P., Brescansin, L.M., McKoy, V., (1990) Phys. Rev. A, 41, p. 2903. , 10.1103/PhysRevA.41.2903Do Varella, N.M.T., De Carvalho, C.R.C., Lima, M.A.P., (2001) New Directions in Antimatter Chemistry and Physics, , edited by C. M. Surko and F. A. Gianturco (Kluwer, AmsterdamSullivan, J.P., Gilbert, S.J., Buckman, S.J., Surko, C.M., (2001) J. Phys. B, 34, p. 467. , 10.1088/0953-4075/34/15/102Arretche, F., Da Costa, R.F., D'A. Sanchez, S., Hisi, A.N.S., De Oliveira, E.M., Do Varella, N.M.T., Lima, M.A.P., (2006) Nucl. Instrum. Methods Phys. Res. B, 247, p. 13. , 10.1016/j.nimb.2006.01.032Marler, J.P., Surko, C.M., (2005) Phys. Rev. A, 72, p. 062702. , 10.1103/PhysRevA.72.062702Capitelli, M., Gorse, C., (2005) IEEE Trans. Plasma Sci., 33, p. 1832. , 10.1109/TPS.2005.860084Khare, B.N., Meyyappan, M., Cassell, A.M., Nguyen, C.V., Han, J., (2002) Nano Lett., 2, p. 73. , 10.1021/nl015646jZheng, G., Li, Q., Jiang, K., Zhang, X., Chen, J., Ren, Z., Fan, S., (2007) Nano Lett., 7, p. 1622. , 10.1021/nl070585wFeshbach, H., (1958) Ann. Phys. (N.Y.), 5, p. 357. , 10.1016/0003-4916(58)90007-1Feshbach, H., (1962) Ann. Phys. (N.Y.), 19, p. 287. , 10.1016/0003-4916(62)90221-XChen, J.C.Y., (1966) Phys. Rev., 148, p. 66. , 10.1103/PhysRev.148.66O'Malley, T.F., (1966) Phys. Rev., 150, p. 14. , 10.1103/PhysRev.150.14Bardsley, J.N., Herzenberg, A., Mandl, F., (1966) Proc. Phys. Soc. London, 89, p. 321. , 10.1088/0370-1328/89/2/313Bardsley, J.N., (1968) J. Phys. B, 1, p. 349. , 10.1088/0022-3700/1/3/303Dubé, L., Herzenberg, A., (1979) Phys. Rev. A, 20, p. 194. , 10.1103/PhysRevA.20.194Domcke, W., Cederbaum, L.S., (1977) Phys. Rev. A, 16, p. 1465. , 10.1103/PhysRevA.16.1465Hazi, A.U., Rescigno, T.N., Kurilla, M., (1981) Phys. Rev. A, 23, p. 1089. , 10.1103/PhysRevA.23.1089Born, M., Oppenheimer, J.R., (1927) Ann. Phys., 84, p. 457. , 10.1002/andp.19273892002Birtwistle, D.T., Herzenberg, A., (1971) J. Phys. B, 4, p. 53. , 10.1088/0022-3700/4/1/009McCurdy, C.W., Turner, J.L., (1983) J. Chem. Phys., 78, p. 6773. , 10.1063/1.444677Takatsuka, K., McKoy, V., (1984) Phys. Rev. A, 30, p. 1734. , 10.1103/PhysRevA.30.1734Lima, M.A.P., McKoy, V., (1988) Phys. Rev. A, 38, p. 501. , 10.1103/PhysRevA.38.501Germano, J.S.E., Lima, M.A.P., (1993) Phys. Rev. A, 47, p. 3976. , 10.1103/PhysRevA.47.3976Lino, J.L.S., Germano, J.S.E., Da Silva, E.P., Lima, M.A.P., (1998) Phys. Rev. A, 58, p. 3502. , 10.1103/PhysRevA.58.3502Varella Do N, M.T., Lima, M.A.P., (2007) Phys. Rev. A, 76, p. 052701. , 10.1103/PhysRevA.76.052701Gibson, T.L., Lima, M.A.P., McKoy, V., Huo, W.M., (1987) Phys. Rev. A, 35, p. 2473. , 10.1103/PhysRevA.35.2473Hunt, W.J., Goddart Iii, A., (1969) Chem. Phys. Lett., 3, p. 414. , 10.1016/0009-2614(69)80154-5Takahashi, K., Ikeda, K., (1993) J. Chem. Phys., 99, p. 8680. , 10.1063/1.465592Kosloff, D., Kosloff, R., (1983) J. Comput. Phys., 52, p. 35. , 10.1016/0021-9991(83)90015-3Kosloff, R., (1988) J. Phys. Chem., 92, p. 2087. , 10.1021/j100319a003Kolos, W., Wolniewicz, L., (1965) J. Chem. Phys., 43, p. 2429. , 10.1063/1.1697142Kolos, W., Rychlewski, J., (1995) J. Mol. Spectrosc., 169, p. 341. , 10.1006/jmsp.1995.1028Takatsuka, K., Hashimoto, N., (1995) J. Chem. Phys., 103, p. 6057. , 10.1063/1.470434Breit, G., Wigner, E.P., (1936) Phys. Rev., 49, p. 519. , 10.1103/PhysRev.49.519Orel, A.E., Kulander, K.C., Rescigno, T.N., (1995) Phys. Rev. Lett., 74, p. 4807. , 10.1103/PhysRevLett.74.4807Haxton, D.J., McCurdy, C.W., Rescigno, T.N., (2006) Phys. Rev. A, 73, p. 062724. , 10.1103/PhysRevA.73.062724Sullivan, J.P., Marler, J.P., Gilbert, S.J., Buckman, S.J., Surko, C.M., (2001) Phys. Rev. Lett., 87, p. 073201. , 10.1103/PhysRevLett.87.073201Zhou, S., Li, H., Kauppila, W.E., Kwan, C.K., Stein, T.S., (1997) Phys. Rev. A, 55, p. 361. , 10.1103/PhysRevA.55.361Kwan, C.K., Kauppila, W.E., Nazaran, S., Przybyla, D., Scahill, N., Stein, T.S., (1998) Nucl. Instrum. Methods Phys. Res. B, 143, p. 61. , 10.1016/S0168-583X(97)00936-

Elastic Scattering Of Low-energy Electron By Lignin Precursors

We present cross sections for electron collisions with monolignol precursors obtained with the Schwinger Multichannel method. For Cs phenol system, π* resonances are found in the A" irreducible representation. So, mechanisms for dissociative electron attachment could give rise if σ* resonances are found in the monolignols. © Published under licence by IOP Publishing Ltd.388PART 5De Cerqueira Leite, R.C., (2009) Energy, 34, p. 655. , 10.1016/j.energy.2008.11.001 0360-5442Oliveira, C., (2008) Appl. Phys. Lett., 93, p. 041503. , 10.1063/1.2967016 0003-6951Boudaïffa, B., (2000) Sience, 287, p. 1658. , 10.1126/science.287.5458.1658 0036-8075Da Costa, R.F., (2004) J. Phys. B: At. Mol. Phys., 37, p. 129. , 0953-4075 L0