Effects of strong electric fields on resonant structures in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="normal">H</mml:mi></mml:mrow><mml:mrow><mml:mo>−</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>photodetachment

Bryant, H. C.; Clark, David; Butterfield, K. B.; Frost, C.A.; Sharifian, H.; Tootoonchi, H.; Donahue, J. B.; Gram, P. A. M.; Hamm, Marianne E.; Hamm, Robert W.; Pratt, J.C.; Yates, M. A.; Smíth, W. W.

doi:10.1103/physreva.27.2889

Cited by 89 publications

(10 citation statements)

References 35 publications

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“…The shape resonance [24], a doubly excited feature involving an electron bound to the first excited state of hydrogen, can be added by hand to this cross-section to test whether it makes any contribution to the stripping. (As we shall see below, it does not.)…”

Section: Introducing the Shape Resonancementioning

confidence: 99%

Atomic physics with a relativisticH⁻beam

Bryant

Herling

2006

Journal of Modern Optics

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A study is currently under way at the Fermi National Accelerator Laboratory for a superconducting linear accelerator that will accelerate H À ions to 8 GeV. This Proton Driver beam is intended to be injected, stripped down to protons, into the 120 GeV Main Injector for the mass production of neutrinos aimed at a neutrino detector (MINOS) in a mine shaft in Soudan, Minnesota, USA, for the study of neutrino oscillations. The highly relativistic kinematics of the oneand two-electron atomic systems (H 0 and H À ) that could be produced by this accelerator present unique research opportunities in atomic physics for the study of fundamental questions. Finally we shall discuss the effects of black-body radiation on high-energy H À beams.

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Section: Introducing the Shape Resonancementioning

confidence: 99%

Atomic physics with a relativisticH⁻beam

Bryant

Herling

2006

Journal of Modern Optics

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“…Static electric field strengths of up to 3.5 MV cm −1 have been achieved in experiments using a relativistic H atom beam to convert a modest laboratory magnetic field into a static electric field in the atom rest frame [7,8]. Similar experiments for the H − ion have employed rest-frame static electric fields of 1.3 MV cm −1 and higher to examine the effect of such fields on the well known photodetachment resonance structures near the n = 2 threshold [8,9]. For static fields above 2 MV cm −1 the process of field ionization becomes increasingly important [9].…”

Section: Introductionmentioning

confidence: 99%

“…Similar experiments for the H − ion have employed rest-frame static electric fields of 1.3 MV cm −1 and higher to examine the effect of such fields on the well known photodetachment resonance structures near the n = 2 threshold [8,9]. For static fields above 2 MV cm −1 the process of field ionization becomes increasingly important [9]. Nevertheless, the essential point is that, first, experiments for photodetachment of H − in static electric fields of the order of 1 MV cm −1 are capable of being done, and, second, that such experiments would clearly differentiate among the various theoretical predictions which are analysed in this review.…”

Section: Introductionmentioning

confidence: 99%

Interaction of laser radiation with a negative ion in the presence of a strong static electric field

Manakov

Frolov

Starace

et al. 2000

J. Phys. B: At. Mol. Opt. Phys.

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Abstract. This paper provides a general theoretical description of a weakly bound atomic system (a negative ion) interacting simultaneously with two (generally strong) fields, a static electric field and a monochromatic laser field having an arbitrary elliptical polarization. The zerorange δ-potential is used to model the interaction of a bound electron in a negative ion as well as the interaction of a detached electron with the residual atom. Our treatment combines the quasistationary (complex energy) and quasienergy (Floquet) approaches. This quasistationary, quasienergy state (QQES) formalism is the most appropriate one for analysing a decaying quantum system under the influence of a periodic external perturbation. Existing QQES theory is reviewed and some new results are discussed: the Hellmann-Feynman theorem and the normalization procedure for QQES, and the definition of the dipole moment and the dynamic polarizability for a decaying atomic system (in strong static electric and/or laser fields). These results are illustrated using analytical formulae obtained from an exact solution of the QQES problem for a δ-model potential in two strong fields. Finally, from the imaginary part of the dynamic polarizability we obtain analytic results (to first order in the laser-field intensity) for the photodetachment cross section. Our results are then compared with those of previous theoretical studies.

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“…From the experimental side, the P states have been observed in laboratories using synchrotron radiation light sources [1,2]. Electric-field effects on such P-wave states in He have not been investigated, even though the experimental study of the field effects on their counterparts in H\ has a long history [3][4][5][6][7]. On the theoretical side, Nicolaides and Themelis [8] have recently carried out a calculation of DC field effects on the He 2s SC and 2s2p P states.…”

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Strong electric-field effects on the doubly-excited intrashell states of He below the He+(N = 2) threshold

1996

Z Phys D - Atoms, Molecules and Clusters

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The method of complex-coordinate rotation is used to investigate electric-field effects on the doublyexcited 2s2p P, 2p DC, 2p PC and 2s2p P states of He. Strong electric-field strengths up to F"0.02 Ry are used in our present study. Products of Slater orbitals are used to represent the two-electron wave functions, with l "8 being employed for the individual electron. Block matrices with up to¸ "5 (H-states) are used to investigate the convergence behavior for the resonance parameters (resonance energy and width). When the external electric field is turned on, ''classic'' Stark effect is observed for the M"0 and M"$1 components of the two singlet-spin states and for the M"$1 components of the triplet-spin states. Comparisons are made with other calculations when available.PACS: 31.15.Ar; 32.80.Dz; 32.60. #i I IntroductionThis work presents a theoretical investigation of electricfield effects on the doubly-excited states of He below the He>(N"2) threshold. The states under the present study are the 2p DC, 2s2p P, 2p PC and 2s2p P states. From the experimental side, the P states have been observed in laboratories using synchrotron radiation light sources [1,2]. Electric-field effects on such P-wave states in He have not been investigated, even though the experimental study of the field effects on their counterparts in H\ has a long history [3][4][5][6][7]. On the theoretical side, Nicolaides and Themelis [8] have recently carried out a calculation of DC field effects on the He 2s SC and 2s2p P states. In light of the theoretical and possible experimental interest, we now present a theoretical investigation of DC field effect on the doubly-excited 2p DC, 2s2p P, 2p PC and 2s2p P states of He. The method of complex-coordinate rotation [9!11] is used in the present study. This method was used to examine the Stark effect of hydrogen [12,13], and on the N"2 P shape resonance in H\ [14]. Recently, we have carried out investigations of the electric-field effects on the doubly-excited states of H\ by using the method of complex-coordinate rotation [15][16][17][18][19]. Electric-field effects on the M"0 of the 2s SC states were also investigated [20]. A comparison was made between our results for the 2s SC state with those in [8]. In the present work we extend the investigations to study the electric-field effects on the M"$1 components of the P and DC states, and the M"$2 components of the latter state. Furthermore, the present work also reports the electric-field effects on the M"0 and M"$1 components of the 2s2pP and 2p PC states. II Theory and wave functionsThe Hamiltonian of an atom in an external field iswhere F is the external field, and ¹ and » are the usual kinetic and potential operators, respectively. For the He system, ¹ and » are given byandwhere r and r are the coordinates of the electrons with respect to the nucleus and r ""rN !rN ". Z is the charge of the helium nucleus and Z"2. Atomic units are used in our work with energy in Rydberg units. The field strength is in Rydberg units, and 1 Ry"2.57;10 V/cm.In th...

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Effects of strong electric fields on resonant structures inH−photodetachment

Cited by 89 publications

References 35 publications

Atomic physics with a relativisticH⁻beam

Atomic physics with a relativisticH⁻beam

Interaction of laser radiation with a negative ion in the presence of a strong static electric field

Strong electric-field effects on the doubly-excited intrashell states of He below the He+(N = 2) threshold

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Effects of strong electric fields on resonant structures inH−photodetachment

Cited by 89 publications

References 35 publications

Atomic physics with a relativisticH−beam

Atomic physics with a relativisticH−beam

Interaction of laser radiation with a negative ion in the presence of a strong static electric field

Strong electric-field effects on the doubly-excited intrashell states of He below the He+(N = 2) threshold

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Product

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Atomic physics with a relativisticH⁻beam

Atomic physics with a relativisticH⁻beam