### Abstract

Single differential cross-sections for transfer-loss (TL) leading to the production of O^{5+} (1s2s ^{3}S)nl ^{4}L states were computed for 0.2-1.2 MeV/u collisions of O^{5+}(1s^{2}2s) ions with He and H_{2} targets. At these collision energies, 1s loss is significant and electron transfer to n = 3 - 4 levels is dominant. Furthermore, due to spin conservation, quartet states can only be populated by TL.Within the independent particle model (IPM), the probability of 1s electron loss from O^{5+}(1s^{2}2s) projectiles was calculated using the semi-classical approach, while the probability for electron transfer to the O^{5+}(1s2s ^{3}S)nl ^{4}L states (n ≥ 2) was computed using the continuum distorted wave (CDW) approximation. The majority of states with n > 2 can be assumed to have sufficient time to eventually decay with an almost 100% probability to the long-living metastable 1s2s2p ^{4}P level via a much faster sequence of electric dipole transitions, thus establishing an upper limit to such cascade contributions. The inclusion of this cascade feeding is found to lead to a strong enhancement in the production of the 1s2s2p ^{4}P states, particularly for collisions with the H _{2} target, thus reducing dramatically the existing two-order of magnitude discrepancy between older TL calculations (for n = 2 only) and existing zero-degree Auger projectile electron spectroscopy measurements.

Original language | English |
---|---|

Pages (from-to) | 505-508 |

Number of pages | 4 |

Journal | Brazilian Journal of Physics |

Volume | 36 |

Issue number | 2 B |

Publication status | Published - Jun 2006 |

### Fingerprint

### Keywords

- Cascade feeding
- Electron capture
- Ion-atom collisions
- Metastable states

### ASJC Scopus subject areas

- Physics and Astronomy(all)

### Cite this

^{4}P states by transfer-loss cascades in O

^{5+}collisions with He and H

_{2}targets.

*Brazilian Journal of Physics*,

*36*(2 B), 505-508.

**Production of 1s2s2p ^{4}P states by transfer-loss cascades in O^{5+} collisions with He and H_{2} targets.** / Zouros, T. J M; Sulik, B.; Gulyás, L.; Orbán, A.

Research output: Contribution to journal › Article

^{4}P states by transfer-loss cascades in O

^{5+}collisions with He and H

_{2}targets',

*Brazilian Journal of Physics*, vol. 36, no. 2 B, pp. 505-508.

^{4}P states by transfer-loss cascades in O

^{5+}collisions with He and H

_{2}targets. Brazilian Journal of Physics. 2006 Jun;36(2 B):505-508.

}

TY - JOUR

T1 - Production of 1s2s2p4P states by transfer-loss cascades in O5+ collisions with He and H2 targets

AU - Zouros, T. J M

AU - Sulik, B.

AU - Gulyás, L.

AU - Orbán, A.

PY - 2006/6

Y1 - 2006/6

N2 - Single differential cross-sections for transfer-loss (TL) leading to the production of O5+ (1s2s 3S)nl 4L states were computed for 0.2-1.2 MeV/u collisions of O5+(1s22s) ions with He and H2 targets. At these collision energies, 1s loss is significant and electron transfer to n = 3 - 4 levels is dominant. Furthermore, due to spin conservation, quartet states can only be populated by TL.Within the independent particle model (IPM), the probability of 1s electron loss from O5+(1s22s) projectiles was calculated using the semi-classical approach, while the probability for electron transfer to the O5+(1s2s 3S)nl 4L states (n ≥ 2) was computed using the continuum distorted wave (CDW) approximation. The majority of states with n > 2 can be assumed to have sufficient time to eventually decay with an almost 100% probability to the long-living metastable 1s2s2p 4P level via a much faster sequence of electric dipole transitions, thus establishing an upper limit to such cascade contributions. The inclusion of this cascade feeding is found to lead to a strong enhancement in the production of the 1s2s2p 4P states, particularly for collisions with the H 2 target, thus reducing dramatically the existing two-order of magnitude discrepancy between older TL calculations (for n = 2 only) and existing zero-degree Auger projectile electron spectroscopy measurements.

AB - Single differential cross-sections for transfer-loss (TL) leading to the production of O5+ (1s2s 3S)nl 4L states were computed for 0.2-1.2 MeV/u collisions of O5+(1s22s) ions with He and H2 targets. At these collision energies, 1s loss is significant and electron transfer to n = 3 - 4 levels is dominant. Furthermore, due to spin conservation, quartet states can only be populated by TL.Within the independent particle model (IPM), the probability of 1s electron loss from O5+(1s22s) projectiles was calculated using the semi-classical approach, while the probability for electron transfer to the O5+(1s2s 3S)nl 4L states (n ≥ 2) was computed using the continuum distorted wave (CDW) approximation. The majority of states with n > 2 can be assumed to have sufficient time to eventually decay with an almost 100% probability to the long-living metastable 1s2s2p 4P level via a much faster sequence of electric dipole transitions, thus establishing an upper limit to such cascade contributions. The inclusion of this cascade feeding is found to lead to a strong enhancement in the production of the 1s2s2p 4P states, particularly for collisions with the H 2 target, thus reducing dramatically the existing two-order of magnitude discrepancy between older TL calculations (for n = 2 only) and existing zero-degree Auger projectile electron spectroscopy measurements.

KW - Cascade feeding

KW - Electron capture

KW - Ion-atom collisions

KW - Metastable states

UR - http://www.scopus.com/inward/record.url?scp=33749583366&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=33749583366&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:33749583366

VL - 36

SP - 505

EP - 508

JO - Brazilian Journal of Physics

JF - Brazilian Journal of Physics

SN - 0103-9733

IS - 2 B

ER -