Comment on 'e+-H- four-particle threshold break-up'

H. Bluhme; H. Knudsen; J. P. Merrison

doi:10.1088/0953-4075/33/23/401

Comment on 'e+-H- four-particle threshold break-up'

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Department of Physics and Astronomy - Centre for Storage Ring Facilities (ISA)

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Abstract

Poelstra et al (1994 J. Phys. B: At. Mol. Opt. Phys. 27 781-94) have presented a calculation of the Wannier exponent for the four-particle threshold break-up in double ionization of H^- by positron impact. These authors find the threshold power law to be governed by a planar break-up configuration with only one unstable mode. This result has recently been questioned by Kuchiev and Ostrovsky (1998 Phys. Rev. A 58 321-35), who find two unstable modes for the same configuration. The reason for this disagreement remained unclear. In this comment we show both by an intuitive argument and by a simple calculation that it is an unfortunate reduction of coordinates performed in the calculation by Poelstra et al that causes this disagreement.

Original language	English
Journal	Journal of Physics B: Atomic, Molecular and Optical Physics
Volume	33
Issue	23
Pages (from-to)	5463-5466
Number of pages	4
ISSN	0953-4075
DOIs	https://doi.org/10.1088/0953-4075/33/23/401
Publication status	Published - 14 Dec 2000

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abstract = "Poelstra et al (1994 J. Phys. B: At. Mol. Opt. Phys. 27 781-94) have presented a calculation of the Wannier exponent for the four-particle threshold break-up in double ionization of H- by positron impact. These authors find the threshold power law to be governed by a planar break-up configuration with only one unstable mode. This result has recently been questioned by Kuchiev and Ostrovsky (1998 Phys. Rev. A 58 321-35), who find two unstable modes for the same configuration. The reason for this disagreement remained unclear. In this comment we show both by an intuitive argument and by a simple calculation that it is an unfortunate reduction of coordinates performed in the calculation by Poelstra et al that causes this disagreement.",

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AU - Knudsen, H.

AU - Merrison, J. P.

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N2 - Poelstra et al (1994 J. Phys. B: At. Mol. Opt. Phys. 27 781-94) have presented a calculation of the Wannier exponent for the four-particle threshold break-up in double ionization of H- by positron impact. These authors find the threshold power law to be governed by a planar break-up configuration with only one unstable mode. This result has recently been questioned by Kuchiev and Ostrovsky (1998 Phys. Rev. A 58 321-35), who find two unstable modes for the same configuration. The reason for this disagreement remained unclear. In this comment we show both by an intuitive argument and by a simple calculation that it is an unfortunate reduction of coordinates performed in the calculation by Poelstra et al that causes this disagreement.

AB - Poelstra et al (1994 J. Phys. B: At. Mol. Opt. Phys. 27 781-94) have presented a calculation of the Wannier exponent for the four-particle threshold break-up in double ionization of H- by positron impact. These authors find the threshold power law to be governed by a planar break-up configuration with only one unstable mode. This result has recently been questioned by Kuchiev and Ostrovsky (1998 Phys. Rev. A 58 321-35), who find two unstable modes for the same configuration. The reason for this disagreement remained unclear. In this comment we show both by an intuitive argument and by a simple calculation that it is an unfortunate reduction of coordinates performed in the calculation by Poelstra et al that causes this disagreement.

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Comment on 'e+-H- four-particle threshold break-up'

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