Angular distributions of Auger transitions of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">N</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>to dissociative final states

Edwards, A. K.; Zheng, Q.; Wood, R. M.; Mangan, M. A.

doi:10.1103/physreva.55.4269

Phys. Rev. A

1997

DOI: 10.1103/physreva.55.4269

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Angular distributions of Auger transitions ofN2to dissociative final states

A. K. Edwards

Q. Zheng

R. M. Wood

et al.

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Cited by 18 publications

(13 citation statements)

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“…A qualitative agreement between our observed single core-hole decay at 360 eV (marked in Fig. 3) with a previous coincidence experiment [15] validates our molecular frame measurement. We find that the yield of ssDCH Auger electrons is maximal along the molecular axis but similarly low for both 90 and 45 , as shown in Fig.…”

supporting

confidence: 91%

“…In addition, the angular distributions of Auger electrons carry information regarding the shape of core and valence orbitals. A wealth of angle-resolved measurements already exists for the decay of single core holes (SCHs) in molecules [15][16][17][18][19][20]. We use impulsive molecular alignment to fix the molecular axis in the laboratory frame in order to investigate the influence of the valence orbital structure on Auger relaxation of these novel doubly-excited ssDCH states.…”

mentioning

confidence: 99%

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Auger Electron Angular Distribution of Double Core-Hole States in the Molecular Reference Frame

et al. 2010

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supporting

confidence: 91%

mentioning

confidence: 99%

Auger Electron Angular Distribution of Double Core-Hole States in the Molecular Reference Frame

et al. 2010

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mentioning

confidence: 94%

“…On top of this a diffraction pattern from the interaction of the Auger electron wave with the molecular potential has been seen in the calculations. None of these effects have been observed experimentally until now [1,9].The experiment was performed at Bl 4.0 [10] of the Advanced Light Source using the COLTRIMS technique (Cold Target Recoil Ion Momentum Spectroscopy) [11]. The photon beam intersected a supersonic molecular gas jet.…”

mentioning

confidence: 99%

Auger Electron Emission from Fixed-in-Space CO

et al. 2003

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We have measured the angular distribution of Carbon K-Auger electrons from fixed in space, core-ionized, CO molecules in coincidence with the kinetic energy release of the C + and O + fragments . We find a very narrow ejection of Auger electrons in the direction of the oxygen and an oscillatory diffraction pattern. Even for similar electron energies, the angular distribution strongly depends on the symmetry of the final state. Our results do not support an earlier study (Guillemin et al [1]) which claimed observation of a breakdown of the two-step model of Auger and photoelectron emission.The study of Auger decay from molecules still pursues many open questions. One of the challenges results from the number and complexity of the final states. The many very broad overlapping structures in the Auger energy distribution often do not allow for a clear assignment of the decay channel [2]. A second challenge results from the interaction of the Auger electron with the molecular potential. Similar to photoelectrons [3,4] the Auger electron will be multiply scattered in the molecule hence modifying Auger rates and angular distributions. A third challenge was posed recently by the claim [1] that even off-resonance the creation of a core hole by photo-ionization and its subsequent Auger decay cannot be treated as two independent steps (two-step model), as has been commonly assumed [3,5].In the present letter we address these three challenges by reporting an experiment on the Auger decay of carbon K-shell ionized CO + . We have measured the Auger electron energy and angle in coincidence with the energy and angle of both fragment ions of the CO 2+ . Such complete monitoring of the process results in a qualitatively new level of insight into the molecular Auger decay. First the high resolution in electron energy and kinetic energy release (KER) allows determination of the final electronic states of the C + and O + fragments which in turn helps to identify the molecular decay channel. Second and more importantly, the measurement of the direction of fragmentation often, a posteriori, determines the molecular axis at the instant of Auger emission. We therefore obtain Auger electron angular distributions in * Electronic address: doerner@hsb.uni-frankfurt.de the molecular frame. These have, as we show below, a very rich structure. It has been emphasized from the theory side that the angular distributions from fixed in space molecules are a key to deeper understanding of the molecular Auger process [3,7,8]. Zähringer et al. have shown that the Auger electron angular distribution can be understood as resulting from two processes acting together. The symmetry of the molecular states involved and their nonspherical electron density lead to a coarse structure. On top of this a diffraction pattern from the interaction of the Auger electron wave with the molecular potential has been seen in the calculations. None of these effects have been observed experimentally until now [1,9].The experiment was performed at Bl 4.0 [10] of the Advanc...

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“…Several theoretical approaches to the description of Auger electron MFADs have been developed [19][20][21][22], but only a few numerical calculations are available for normal (i.e., nonresonant) Auger decay [20][21][22][23], and only two for resonant Auger decay [24,25].…”

mentioning

confidence: 99%

Molecular-Frame Angular Distributions of ResonantCO:C(1s)Auger Electrons

et al. 2008

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The molecular-frame angular distributions of resonantly excited CO:C(1s) --> pi* Auger electrons were determined using angle-resolved electron-ion coincidence spectroscopy in combination with a novel transformation procedure. Our new methodology yields full three-dimensional electron angular distributions with high energy resolution from the measurement of electrons at only two angles. The experimentally determined distributions are well reproduced by calculations performed in a simple one-center approximation, allowing an unambiguous identification of several overlapping Auger lines.

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Angular distributions of Auger transitions ofN2to dissociative final states

Cited by 18 publications

References 13 publications

Auger Electron Angular Distribution of Double Core-Hole States in the Molecular Reference Frame

Auger Electron Angular Distribution of Double Core-Hole States in the Molecular Reference Frame

Auger Electron Emission from Fixed-in-Space CO

Molecular-Frame Angular Distributions of ResonantCO:C(1s)Auger Electrons

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