Threshold photoelectrons coincidence spectroscopy of the rare gases Ne, Ar, Kr and Xe

Hall, R. I.; Dawber, G; McConkey, A G; MacDonald, M A; King, G C

doi:10.1007/bf01429261

Cited by 26 publications

(8 citation statements)

References 18 publications

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“…First of all it is evident that there is no suppression of the 3po channel with respect to the I po channel. This result is in agreement with the relative threshold signals measured by photoelectron coincidence spectroscopy (Hall et al 1992a). It is in contradiction to the propensity mies for direct DPI (Huetz et al 1991).…”

supporting

confidence: 86%

State-selective study of the direct double photoionization of the Ne valence shell

Schartner¹,

Mentzel²,

Magel³

et al. 1993

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

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Cross sections for double photoionization of the Ne L shell into the 2s2p5 3po and I P" and the 2s02p6 I se states were measured for energies from threshold up to 150 eV. using photon induced fluorescence spectroscopy. Both 2s2p5 channeIs were observed with comparable magnitude in contradienon to a propensity rule based on the Wannier-Peterkop-Rau theory. A comparison of the summed 3po and IP" cross sections with MBPT calculations results in a deviation of 50%.

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supporting

confidence: 86%

State-selective study of the direct double photoionization of the Ne valence shell

Schartner¹,

Mentzel²,

Magel³

et al. 1993

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

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“…However, this spectrum differs dramatically from the experimental spectrum (see, for example, Refs. [9,13]), which shows the pronounced intensity decrease when going from outer-valence to inner-valence spectral regions. The intensity of the 2s 0 2p 6 ( 1 S 0 ) state is particularly weak.…”

Section: B Krypton Argon and Neonmentioning

confidence: 99%

“…Except for some anomalies in the intensity distributions [8,9,13,15], the main states in the low-energy spectral regions of these ions describing the removal of the two outermost p electrons are well understood, which makes this class of dications excellent candidates for testing and calibration of new methods. The situation is more complex in deeper energy regions, where at least one of the emitted electrons belongs to the outermost s shell.…”

Section: Introductionmentioning

confidence: 99%

Strong configuration interaction in the double ionization spectra of noble gases studied by the relativistic propagator method

2012

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In this work, the four-component two-particle propagator technique is employed for the calculation of double ionization spectra of the noble gas atoms Ne through Rn. For a correct assignment of the individual final states, inclusion of spin-orbit coupling and electron correlation is mandatory and is accounted for in the framework of the relativistic propagator. It was observed that the ns 2 np 4 ( 3 P 2,1,0 , 1 D 2 , 1 S 0 ) manifolds of all investigated noble gas dications exhibit a clear main-state character with only small admixture from other configurations. This also refers to the 2s 1 2p 5 ( 3 P o 2,1,0 , 1 P o 1 ) states of Ne 2+ . In the argon, krypton, and xenon dications, the ns 1 np 5 ( 3 P o 2,1,0 ) states, and especially the ns 1 np 5 ( 1 P o 1 ) ones, lose intensity due to pronounced configuration interaction. These states experience strong mixings with ground-state shake-up satellites, which occupy the same energy region. The composition of the 5s 1 5p 5 ( 1 P o 1 ) singlet state of Xe 2+ is studied in detail by analyzing the corresponding eigenvector. As long as a LS coupling picture can be approximately maintained, the amount of singlet-triplet splitting decreases in the sequence from neon to xenon. In the 6s 1 6p 5 manifold of Rn 2+ , a complete disappearance of well-defined main states takes place leading to a dense and complicated spectrum governed by very strong multiconfiguration effects. Relativistic corrections to the Coulomb interaction are accounted for by inclusion of the Gaunt (magnetic) term.

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“…The real power of the penetrating field approach, besides its ability to easily collect threshold photoelectron spectra with excellent resolution, was realized by reversing the voltage on the ion side so that both electrons in double ionization processes could be extracted in opposite directions and collected in coincidence (threshold photoelectron photoelectron coincidence, or TPEPECO). 31,32 That is, one detector is tuned to collect threshold electrons, while the other detector is tuned to collect electrons of slightly positive energy. Whilst initially applied to atoms, it was later appreciated that high-resolution spectra of vibrationallyresolved dications of molecules could then be determined with a resolution essentially limited to that of the photon source.…”

Section: Detection Of Threshold Electrons By Time Of Flightmentioning

confidence: 99%

Advances in threshold photoelectron spectroscopy (TPES) and threshold photoelectron photoion coincidence (TPEPICO)

Baer

Tuckett

2017

Phys. Chem. Chem. Phys.

124

116

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The history and evolution of molecular threshold photoelectron spectroscopy and threshold photoelectron photoion coincidence spectroscopy (TPEPICO) over the last fifty years are reviewed. Emphasis is placed on instrumentation and the extraction of dynamical information about energy selected ion dissociation, not on the detailed spectroscopy of certain molecules. Three important advances have expanded greatly the power of the technique, and permitted its implementation on modern synchrotron radiation beamlines. The use of velocity focusing of threshold electrons onto an imaging detector in the 1990s simultaneously improved the sensitivity and electron energy resolution, and also facilitated the subtraction of hot electron background in both threshold electron spectroscopy and TPEPICO studies. The development of multi-start multi-stop collection detectors for both electrons and ions in the 2000s permitted the use of the full intensity of modern synchrotron radiation thereby greatly improving the signal-to-noise ratio. Finally, recent developments involving imaging electrons in a range of energies as well as ions onto separate position-sensitive detectors has further improved the collection sensitivity so that low density samples found in a variety of studies can be investigated. As a result, photoelectron photoion coincidence spectroscopy is now well positioned to address a range of challenging problems that include the quantitative determination of compositions of isomer mixtures, and the detection and spectroscopy of free radicals produced in pyrolysis or discharge sources as well as in combustion studies.

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Threshold photoelectrons coincidence spectroscopy of the rare gases Ne, Ar, Kr and Xe

Cited by 26 publications

References 18 publications

State-selective study of the direct double photoionization of the Ne valence shell

State-selective study of the direct double photoionization of the Ne valence shell

Strong configuration interaction in the double ionization spectra of noble gases studied by the relativistic propagator method

Advances in threshold photoelectron spectroscopy (TPES) and threshold photoelectron photoion coincidence (TPEPICO)

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