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Dissociative recombination and low-energy inelastic electron collisions of the helium dimer ion

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Pedersen, HB Buhr, H. Altevogt, S. Andrianarijaona, V Kreckel, H. de Ruette, Nathalie [UCL] Urbain, Xavier [UCL] Wolf, A.

The dissociative recombination (DR) of He-3 He-4(+) has been investigated at the heavy-ion Test Storage Ring (TSR) in Heidelberg by observing neutral products from electron-ion collisions in a merged beams configuration at relative energies from near-zero (thermal electron energy about 10 meV) up to 40 eV. After storage and electron cooling for 35 s, an effective DR rate coefficient at near-zero energy of 3 x 10(-9) cm(3)s(-1) is found. The temporal evolution of the neutral product rates and fragment imaging spectra reveals that the populations of vibrational levels in the stored ion beam are nonthermal with fractions of similar to 0.1-1% in excited levels up to at least v=4, having a significant effect on the observed DR signals. With a pump-probe-type technique using DR fragment imaging while switching the properties of the electron beam, the vibrational excitation of the ions is found to originate mostly from ion collisions with the residual gas. Also, the temporal evolution of the DR signals suggests that a strong electron induced rotational cooling occurs in the vibrational ground state, reaching a rotational temperature near or below 300 K. From the absolute rate coefficient and the shape of the fragment imaging spectrum observed under stationary conditions, the DR rate coefficient from the vibrational ground state is determined; converted to a thermal electron gas at 300 K it amounts to (3.3 +/- 0.9) x 10(-10) cm(3)s(-1). The corresponding branching ratios from v=0 to the atomic final states are found to be (3.7 +/- 1.2) % for 1s2s S-3, (37.4 +/- 4.0) % for 1s2s S-1, (58.6 +/- 5.2) % for 1s2p P-3, and (2.9 +/- 3.0) % for 1s2p P-1. A DR rate coefficient in the range of 2 x 10(-7) cm(3)s(-1) or above is inferred for vibrational levels v=3 and higher. As a function of the collision energy, the measured DR rate coefficient displays a structure around 0.2 eV. At higher energies, it has one smooth peak around 7.3 eV and a highly structured appearance at 15-40 eV. The small size of the observed effective DR rate coefficient at near-zero energy indicates that the electron induced rotational cooling is due to inelastic electron-ion collisions and not due to selective depletion of rotational levels by DR.

Document type Article de périodique (Journal article) – Article de recherche
Access type Accès restreint
Publication date 2005
Language Anglais
Journal information "Physical review. A, Atomic, molecular, and optical physics" - Vol. 72, no. 1 (2005)
Peer reviewed yes
Publisher American Physical Soc (College Pk)
issn 1050-2947
e-issn 1094-1622
Publication status Publié
Affiliation UCL - SC/PHYS - Département de physique
Links
  1. D. R. Bates, Adv. At., Mol., Opt. Phys., 34, 427 (1994)
  2. Larsson Mats, DISSOCIATIVE RECOMBINATION WITH ION STORAGE RINGS, 10.1146/annurev.physchem.48.1.151
  3. Kella D., The Source of Green Light Emission Determined from a Heavy-Ion Storage Ring Experiment, 10.1126/science.276.5318.1530
  4. Guberman S. L., Mechanism for the Green Glow of the Upper Ionosphere, 10.1126/science.278.5341.1276
  5. Vejby-Christensen L., Kella D., Pedersen H. B., Andersen L. H., Dissociative recombination of NO+, 10.1103/physreva.57.3627
  6. Sun Hosung, Nakamura Hiroki, Theoretical study of the dissociative recombination of NO+ with slow electrons, 10.1063/1.458966
  7. Bates D. R., Electron Recombination in Helium, 10.1103/physrev.77.718
  8. Kokoouline Viatcheslav, Greene Chris H., Unified theoretical treatment of dissociative recombination ofD3htriatomic ions: Application toH3+andD3+, 10.1103/physreva.68.012703
  9. Mulliken Robert S., Rare-Gas and Hydrogen Molecule Electronic States, Noncrossing Rule, and Recombination of Electrons with Rare-Gas and Hydrogen Ions, 10.1103/physrev.136.a962
  10. Carata L., Orel A. E., Suzor-Weiner A., Dissociative recombination ofHe2+molecular ions, 10.1103/physreva.59.2804
  11. Stancil P. C., Lepp S., Dalgarno A., The Deuterium Chemistry of the Early Universe, 10.1086/306473
  12. Deloche R., Monchicourt P., Cheret M., Lambert F., High-pressure helium afterglow at room temperature, 10.1103/physreva.13.1140
  13. Phelps Arthur V., Brown Sanborn C., Positive Ions in the Afterglow of a Low Pressure Helium Discharge, 10.1103/physrev.86.102
  14. Hornbeck John A., Molnar J. P., Mass Spectrometric Studies of Molecular Ions in the Noble Gases, 10.1103/physrev.84.621
  15. X. Urbain, Proceedings of the 1999 Conference on Dissociative Recombination, Theory, Experiment and Applications IV (1999)
  16. M. Cheret, C.R. Seances Acad. Sci., Ser. A, 275, 77 (1972)
  17. Biondi Manfred A., Brown Sanborn C., Measurement of Electron-Ion Recombination, 10.1103/physrev.76.1697
  18. V. A. Ivanov, Opt. Spectrosc., 54, 552 (1983)
  19. V. A. Ivanov, Opt. Spektrosk., 54, 927 (1983)
  20. V. A. Ivanov, Opt. Spectrosc., 65, 445 (1989)
  21. V. A. Ivanov, Opt. Spektrosk., 65, 750 (1989)
  22. Cencek Wojciech, Rychlewski Jacek, Many‐electron explicitly correlated Gaussian functions. II. Ground state of the helium molecular ion He+2, 10.1063/1.468682
  23. Ackermann J., Hogreve H., Adiabatic calculations and properties of the He2+ molecular ion, 10.1016/0301-0104(91)87132-f
  24. Maas J.G., Van Asselt N.P.F.B., Nowak P.J.C.M., Los J., Peyerimhoff S.D., Buenker R.J., Ab initio calculation of the X2Σ+u state of He+2 and adjustment governed by translational spectroscopic measurements, 10.1016/0301-0104(76)80102-4
  25. Flamme J.P., Mark T., Los J., Laser-induced photodissociation of He+2, 10.1016/0009-2614(80)80546-x
  26. Yu Nan, Wing William H., Observation of the infrared spectrum of the helium molecular ion(3He4He)+, 10.1103/physrevlett.59.2055
  27. Coman L., Guna M., Simons L., Hardy K. A., First Measurement of the Rotational Constants for the Homonuclear Molecular IonHe2+, 10.1103/physrevlett.83.2715
  28. van der Zande W. J., Ubachs W., Comment on “First Measurement of the Rotational Constants for the Homonuclear Molecular IonHe2+”, 10.1103/physrevlett.84.3212
  29. Hardy K., Wang X. W., Hardy and Wang Reply:, 10.1103/physrevlett.84.3213
  30. Cohen James S., Diabatic-states representation forHe*(n≥3)+ He collisions, 10.1103/physreva.13.86
  31. S. L. Guberman, Physics of Ion-Ion and Electron-Ion Collisions, Vol. 83 of NATO Advanced Study Institute Series B: Physics (1983)
  32. Habs D., Baumann W., Berger J., Blatt P., Faulstich A., Krause P., Kilgus G., Neumann R., Petrich W., Stokstad R., Schwalm D., Szmola E., Welti K., Wolf A., Zwickler S., Jaeschke E., Krämer D., Bisoffi G., Blum M., Friedrich A., Geyer C., Grieser M., Heyng H.W., Holzer B., Ihde R., Jung M., Matl K., Ott W., Povh B., Repnow R., Steck M., Steffens E., Dutta D., Kühl T., Marx D., Schröder S., Gerhard M., Grieser R., Huber G., Klein R., Krieg M., Schmidt N., Schuch R., Babb J.F., Spruch L., Arnold W., Noda A., First experiments with the heidelberg test storage ring TSR, 10.1016/0168-583x(89)90383-2
  33. X. Urbain, Proceedings of the 1999 Conference on Dissociative Recombination, Theory, Experiment and Applications IV (1999)
  34. Kilgus G., Habs D., Schwalm D., Wolf A., Badnell N. R., Müller A., High-resolution measurement of dielectronic recombination of lithiumlikeCu26+, 10.1103/physreva.46.5730
  35. Amitay Z., Zajfman D., Forck P., Hechtfischer U., Seidel B., Grieser M., Habs D., Repnow R., Schwalm D., Wolf A., Dissociative recombination ofCH+: Cross section and final states, 10.1103/physreva.54.4032
  36. Al-Khalili A., Rosén S., Danared H., Derkatch A. M., Källberg A., Larsson M., Le Padellec A., Neau A., Semaniak J., Thomas R., af Ugglas M., Vikor L., Zong W., van der Zande W. J., Urbain X., Jensen M. J., Bilodeau R. C., Heber O., Pedersen H. B., Safvan C. P., Andersen L. H., Lange M., Levin J., Gwinner G., Knoll L., Scheffel M., Schwalm D., Wester R., Zajfman D., Wolf A., Absolute high-resolution rate coefficients for dissociative recombination of electrons withHD+:Comparison of results from three heavy-ion storage rings, 10.1103/physreva.68.042702
  37. Wester R, Albrecht F, Grieser M, Knoll L, Repnow R, Schwalm D, Wolf A, Baer A, Levin J, Vager Z, Zajfman D, Coulomb explosion imaging at the heavy ion storage ring TSR, 10.1016/s0168-9002(98)00553-1
  38. Amitay Z., Baer A., Dahan M., Levin J., Vager Z., Zajfman D., Knoll L., Lange M., Schwalm D., Wester R., Wolf A., Schneider I. F., Suzor-Weiner A., Dissociative recombination of vibrationally excitedHD+: State-selective experimental investigation, 10.1103/physreva.60.3769
  39. Green T S, Intense ion beams, 10.1088/0034-4885/37/10/002
  40. Grieser M., Deitinghoff H., Habs D., von Hahn R., Jaeschke E., Kleffner C.-M., Kössler V., Papureanu S., Repnow R., Rhee M.-H., Schwalm D., Schempp A., Upgrading of the Heidelberg accelerator facility with a new high current injector, 10.1016/0168-9002(93)90618-r
  41. von Hahn R., Grieser M., Habs D., Jaeschke E., Kleffner C.-M., Liebmann J., Papureanu S., Repnow R., Schwalm D., Stampfer M., Development of seven-gap resonators for the Heidelberg high current injector, 10.1016/0168-9002(93)90639-y
  42. Steck M., Bisoffi G., Blum M., Friedrich A., Geyer C., Grieser M., Holzer B., Jaeschke E., Jung M., Krämer D., Matl K., Ott W., Repnow R., Electron cooling of heavy ions, 10.1016/0168-9002(90)91817-u
  43. Pastuszka S., Schramm U., Grieser M., Broude C., Grimm R., Habs D., Kenntner J., Miesner H.-J., Schüβler T., Schwalm D., Wolf A., Electron cooling and recombination experiments with an adiabatically expanded electron beam, 10.1016/0168-9002(95)00786-5
  44. Poth H, Electron cooling: Theory, experiment, application, 10.1016/0370-1573(90)90040-9
  45. Lampert A., Wolf A., Habs D., Kenntner J., Kilgus G., Schwalm D., Pindzola M. S., Badnell N. R., High-resolution measurement of the dielectronic recombination of fluorinelike selenium ions, 10.1103/physreva.53.1413
  46. Amitay Z., Zajfman D., Forck P., Rotational and vibrational lifetime of isotopically asymmetrized homonuclear diatomic molecular ions, 10.1103/physreva.50.2304
  47. Ellison Frank O., Intensities of Vibrational and Rotational Spectra of Charged Diatomic Molecules, 10.1063/1.1732535
  48. G. Herzberg, Spectra of Diatomic Molecules (1950)
  49. Zajfman D., Krohn S., Lange M., Kreckel H., Lammich L., Strasser D., Schwalm D., Urbain X., Wolf A., Physics with molecular ions in storage rings, 10.1016/s0168-583x(02)01934-1
  50. Lammich L., Strasser D., Kreckel H., Lange M., Pedersen H. B., Altevogt S., Andrianarijaona V., Buhr H., Heber O., Witte P., Schwalm D., Wolf A., Zajfman D., Evidence for Subthermal Rotational Populations in Stored Molecular Ions through State-Dependent Dissociative Recombination, 10.1103/physrevlett.91.143201
  51. Tanabe T., Takagi H., Katayama I., Chida K., Watanabe T., Arakaki Y., Haruyama Y., Saito M., Nomura I., Honma T., Noda K., Hosono K., Evidence of Superelastic Electron Collisions fromH2+Studied by Dissociative Recombination Using an Ultracold Electron Beam from a Cooler Ring, 10.1103/physrevlett.83.2163
  52. Krohn S., Amitay Z., Baer A., Zajfman D., Lange M., Knoll L., Levin J., Schwalm D., Wester R., Wolf A., Electron-induced vibrational deexcitation ofH2+, 10.1103/physreva.62.032713
  53. Hechtfischer U., Amitay Z., Forck P., Lange M., Linkemann J., Schmitt M., Schramm U., Schwalm D., Wester R., Zajfman D., Wolf A., Near-Threshold Photodissociation of ColdCH+in a Storage Ring, 10.1103/physrevlett.80.2809
  54. Nakashima Keiji, Takagi Hidekazu, Nakamura Hiroki, Dissociative recombination of H+2, HD+, and D+2 by collisions with slow electrons, 10.1063/1.452275
  55. Rabadán Ismanuel, Sarpal Baljit K., Tennyson Jonathan, Calculated rotational and vibrational excitation rates for electron—HeH+ collisions, 10.1046/j.1365-8711.1998.01741.x
  56. Rabadán Ismanuel, Sarpal Baljit K, Tennyson Jonathan, On the calculation of electron-impact rotational excitation cross sections for molecular ions, 10.1088/0953-4075/31/9/020
  57. Faure A., Tennyson J., Electron-impact rotational excitation of linear molecular ions, 10.1046/j.1365-8711.2001.04480.x
  58. VAGER Z., NAAMAN R., KANTER E. P., Coulomb Explosion Imaging of Small Molecules, 10.1126/science.244.4903.426
  59. D. Zajfman, Comments At. Mol. Phys., 29, 369 (1994)
  60. Zajfman D., Graber T., Kanter E. P., Vager Z., Influence of multiple scattering on the Coulomb-explosion imaging of fast molecules, 10.1103/physreva.46.194
  61. Garcia-Molina Rafael, Denton Cristian D., Abril Isabel, Arista Néstor R., Energy-loss and exit-angle distributions of fragmentedH2+ions after traversing carbon foils, 10.1103/physreva.62.012901
  62. Lammich L., Buhr H., Kreckel H., Krohn S., Lange M., Schwalm D., Wester R., Wolf A., Strasser D., Zajfman D., Vager Z., Abril I., Heredia-Avalos S., Garcia-Molina R., Coulomb-explosion imaging ofCH2+: Target-polarization effects and bond-angle distribution, 10.1103/physreva.69.062904
  63. Forck P., Broude C., Grieser M., Habs D., Kenntner J., Liebmann J., Repnow R., Schwalm D., Wolf A., Amitay Z., Zajfman D., New resonances in the dissociative recombination of vibrationally coldCD+, 10.1103/physrevlett.72.2002
  64. Orel A. E., Kulander K. C., Resonance-enhanced dissociation of a molecular ion below its electronic excitation threshold, 10.1103/physreva.54.4992
  65. Urbain X, Djurić N, Safvan C P, Jensen M J, Pedersen H B, Søgaard L Vejby, Andersen L H, Storage ring study of the dissociative recombination of He+2, 10.1088/0953-4075/38/1/004
  66. J. Royal, Proc. 6th Int. Conf. on Dissociative Recombination, Theory, Experiments and Applications, Mosbach, Germany, 2004 (2004)
  67. Guberman Steven L., Dissociative recombination without a curve crossing, 10.1103/physreva.49.r4277
  68. Sarpal B K, Tennyson J, Morgan L A, Dissociative recombination without curve crossing: study of HeH+, 10.1088/0953-4075/27/24/017
  69. Semaniak J., Rosén S., Sundström G., Strömholm C., Datz S., Danared H., af Ugglas M., Larsson M., van der Zande W. J., Amitay Z., Hechtfischer U., Grieser M., Repnow R., Schmidt M., Schwalm D., Wester R., Wolf A., Zajfman D., Product-state distributions in the dissociative recombination ofHeD+3andHeH+4, 10.1103/physreva.54.r4617
  70. Krohn S., Lange M., Grieser M., Knoll L., Kreckel H., Levin J., Repnow R., Schwalm D., Wester R., Witte P., Wolf A., Zajfman D., Rate Coefficients and Final States for the Dissociative Recombination ofLiH+, 10.1103/physrevlett.86.4005
Bibliographic reference Pedersen, HB ; Buhr, H. ; Altevogt, S. ; Andrianarijaona, V ; Kreckel, H. ; et. al. Dissociative recombination and low-energy inelastic electron collisions of the helium dimer ion. In: Physical review. A, Atomic, molecular, and optical physics, Vol. 72, no. 1 (2005)
Permanent URL http://hdl.handle.net/2078.1/39190