The contribution of the saddle point mechanism to the total ionization cross section in slow atomic collisions

Pieksma, Marc; Ovchinnikov, S. Yu.

doi:10.1088/0953-4075/24/11/012

Cited by 49 publications

(25 citation statements)

References 21 publications

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“…Therefore, used a TOF-spectrometer with large acceptance angle to measure the longitudinal electron momentum distribution at 1-6 keV p + H collisions. They found agreement with the theoretical results (Pieksma and Ovchinnikov 1991) but did not resolve the transversal momentum. First two-dimensional momentum distributions of SP electrons were measured by Kravis et al (1996) and Abdallah et al (1997) by projecting the electrons and recoil ions with a high electric field onto position sensitive detectors.…”

Section: Ionisation By Slow Projectiles: Saddle Point Electronsmentioning

confidence: 69%

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Recoil-ion and electron momentum spectroscopy: reaction-microscopes

et al. 2003

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Recoil-ion and electron momentum spectroscopy is a rapidly developing technique that allows one to measure the vector momenta of several ions and electrons resulting from atomic or molecular fragmentation. In a unique combination, large solid angles close to π Microccopes -the "bubble chambers of atomic physics" -mark the decisive step forward to investigate many-particle quantum-dynamics occurring when atomic and molecular systems or even surfaces and solids are exposed to time-dependent external electromagnetic fields.The present review concentrates on just these latest technical developments and on at least four new classes of fragmentation experiments that have emerged within about the last five years. First, multi-dimensional images in momentum space brought unprecedented information on the dynamics of single-photon induced fragmentation of fixed-in-space molecules and on their structure. Second, a break-through in the investigation of highintensity short-pulse laser induced fragmentation of atoms and molecules has been achieved by using Reaction Microccopes. Third, for electron and ion-impact, the investigation of twoelectron reactions has matured to a state such that first fully differential cross sections (FDCS) are reported. Forth, comprehensive sets of FDCS for single ionisation of atoms by ion-impact, the most basic atomic fragmentation reaction, brought new insight, a couple of surprises and unexpected challenges to theory at keV to GeV collision energies. In addition, a brief summary on the kinematics is provided at the beginning. Finally, the rich future potential of the method is shortly envisaged.2

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Section: Ionisation By Slow Projectiles: Saddle Point Electronsmentioning

confidence: 69%

“…At complex R the states of the same symmetry are connected by branch points. The Hidden Crossing theory (Solov'ev 1986, Pieksma andOvchinnikov 1991) deter-mines the ionisation probability for p + H collisions by integration in the plane of complex R.…”

Section: Ionisation By Slow Projectiles: Saddle Point Electronsmentioning

confidence: 99%

Recoil-ion and electron momentum spectroscopy: reaction-microscopes

et al. 2003

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“…The one-channel adiabatic calculation of ionization has been compared with measurements of the Hf + H + H+ + H + + e by Pieksma and Ovchinnikov (20) and by Pieksma et al (22) at velocities well above the threshold region. These workers find good agreement between theory and experiment thus this method is well established when 1/M << 1.…”

Section: Pw(e)mentioning

confidence: 99%

Adiabatic theory of Wannier threshold laws and ionization cross sections

Macek¹,

Ovchinnikov²

1995

AIP Conference Proceedings

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“…It has been shown [1] that the S superseries provide strong (diabatic) channels for promotion of the system to the continuum ("superpromotion") on the incoming stage of the collision, while the T superseries provide such superpromotion ionization channels during the receding of nuclei [4,9]. It has been also shown [4] that there is a close con- nection between the S and T superpromotion ionization channels with the unstable electron trajectories in the classical treatment of the one-electrontwo-Coulombcenter problem: the S series are related to unstable trajectories of the electrons located on the top of the centrifugal barrier, while the T series are related to the unstable trajectories of electrons located on the top of the potential barrier between the nuclei (" saddle-point electrons" [13]).…”

mentioning

confidence: 99%

“…The relative importance of the two ionization mechanisms in the H(ls)+H+ and H(ls)+He2+ systems has been investigated in Ref. [9].…”

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confidence: 99%

Ionization of hydrogen atoms by multiply charged ions at low energies: The scaling law

1994

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Using the adiabatic superpromotion model of low-energy atomic collisions, a simple scaling relationship is derived for the ionization cross section of hydrogen atoms colliding with multiply charged ions.Detailed ionization-cross-section calculations for the systems H(1s)+He +, C +, and 0 + have been performed and used to determine three numerical constants in the cross-section-scaling relationship. The scaled cross section represents well the available data for fully stripped ions with charge Z ) 2 in the energy region below the cross-section maximum.PACS number(s): 34.50.Fa, 35.80.+s

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The contribution of the saddle point mechanism to the total ionization cross section in slow atomic collisions

Cited by 49 publications

References 21 publications

Recoil-ion and electron momentum spectroscopy: reaction-microscopes

Recoil-ion and electron momentum spectroscopy: reaction-microscopes

Adiabatic theory of Wannier threshold laws and ionization cross sections

Ionization of hydrogen atoms by multiply charged ions at low energies: The scaling law

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