Absolute dipole oscillator strengths for photoabsorption and the molecular and dissociative photoionization of ethylene

Ibuki, Toshio; Cooper, Glyn; Brion, C.E.

doi:10.1016/0301-0104(89)85002-5

Cited by 34 publications

(26 citation statements)

References 37 publications

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“…The sum of the photo double ionization cross sections for the channels measured in this work is about 10% of the total photo absorption cross section of 10 Mb at 40 eV photon energy [24,52,53]. We do not have a direct comparison for the double ionization cross sections of ethylene estimated in this work to previous works, but a similar percentage of double ionization relative to the single ionization was observed for alkanes with two carbon atoms in Ref.…”

Section: Summary: Ethylene Photo Double Ionizationmentioning

confidence: 46%

“…The double ionization of these molecules with photon and particle impact has been explored heavily in the past both in theory and experiment (ethylene [6][7][8] and acetylene [9][10][11][12][13][14][15][16]). Previous studies in ethylene include methods like double-charge-transfer spectroscopy [7,17,18], charge-stripping-mass spectroscopy [19,20], Auger spectroscopy [21,22], and time-of-flight mass spectrometry [23][24][25]. In all these experiments the detection of the doubly charged ion C 2 H 4 2+ is elusive.…”

Section: Introductionmentioning

confidence: 99%

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Photo-double-ionization of ethylene and acetylene near threshold

Gaire¹,

Lee²,

Haxton³

et al. 2014

Phys. Rev. A

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We present kinematically complete measurements of the photo double ionization of ethylene (double CC bond) and acetylene (triple CC bond) hydrocarbons just above the double ionization threshold. We discuss the results in terms of the coincident kinetic energy of the photo electrons and the nuclear kinetic energy release of the recoiling ions. We have incorporated quantum chemistry calculations to interpret which of the electronic states of the dication have been populated and trace the various subsequent fragmentation channels. We suggest pathways that involve the electronic ground and excited states of the precursor ethylene dication and explore the strong influence of the conical intersections between the different electronic states. The nondissociative ionization yield is small in ethylene and high in acetylene when compared with the dissociative ionization channels.The reason for such a striking difference is explained in part on the basis of a propensity rule which influences the population of states in the photo double ionization of a centrosymmetric closed shell molecule by favoring singlet ungerade and triplet gerade final states. This propensity rule and the calculated potential energy surfaces clarify a picture of the dynamics leading to the observed dication dissociation products.

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Section: Summary: Ethylene Photo Double Ionizationmentioning

confidence: 46%

Section: Introductionmentioning

confidence: 99%

Photo-double-ionization of ethylene and acetylene near threshold

Gaire¹,

Lee²,

Haxton³

et al. 2014

Phys. Rev. A

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“…dependence which is only expected to be valid at extremely high photon energies (see section 4 below). For example, in the cases of C2Hz (25), C2H4 (26), and CH30H (27) these procedures have led to satisfactory absolute oscillator strength scales. This curve was then integrated from 250 eV to infinite energy for each spectrum in order to provide an estimate of the valence-shell oscillator strength contribution above the last measured differential oscillator strength data point at 250 eV.…”

Section: Experimental Methodsmentioning

confidence: 99%

Valence shell absolute photoabsorption oscillator strengths, constrained dipole oscillator strength distributions, and dipole properties for CH₃NH₂, (CH₃)₂NH, and (CH₃)₃N

Burton¹,

Chan²,

Cooper³

et al. 1994

Can. J. Chem.

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, 529 (1994).Dipole (e,e) spectroscopy has been used to measure the absolute photoabsorption oscillator strengths (cross sections) for the valence shells of CH3NH?, (CH&NH, and (CH3)3N from the photoabsorption threshold to 250 eV at low resolution (-1 eV fwhm) and to 31 eV at high resolution (0.048 eV fwhm). The observed peaks in the photoabsorption spectra of the methylamines have been assigned to transitions to Rydberg orbital upper states. Our measured photoabsorption data, augmented by mixture rule estimates for high photon energies, have been used in conjunction with Thomas-Reiche-Kuhn sum rule and molar refractivity constraints, to construct constrained dipole oscillator strength distributions for each of the methylamlnes. From these constrained dipole oscillator strength distributions a wide range of related dipole properties have been calculated for each of the methylamines, and in most cases the results so obtained represent the first (reliable) determination of these properties. On fait appel i la spectroscopic dipolaire (e,e) pour mesurer la photoabsorption absolue, les intensitis de l'oscillateur (section droite) des Clectrons de valence du CH3NHI, (CH3)2NH et du (CH&N i partir du seuil de photoabsorption de 250 eV i basse rCsolution (environ 1 eV fwhm) et i 31 eV i haute rtsolution (0,048 eV fwhm). On a attribut les pics observes dans les spectres de photoabsorption des mCthylamines ?I des transitions de Rydberg des orbitales des Ctats supCrieurs. Nous avons utilist nos donnCes de photoabsorption mesurtes et des Cvaluations par la rkgle de mklanges pour les photons de haute Cnergie, de concert avec la rkgle de la somrne de Thomas-Reiche-Khulm et avec les contraintes de rkfractiviti molaire, pour construire la distribution des intensitks de l'oscillateur du dipBle contraint de chaque mithylamine. A partir des distributions des intensitks de l'oscillateur du dip6le contraint, on a calculk un trks grand nombre de propriktCs des dipSles apparentks pour chaque mkthylamine et les rksultats ainsi obtenus represkntent dans la plupart des cas la premikre dkterrnination (fiable) de ces propribtks.[Traduit par la rCdaction]

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“…(b) Comparison between the photon energies and the vertical excitation to the main cationic states. (c) Population of the cationic states after excitation by the spectra shown in (b), calculated with the tabulated values for monochromatic excitation 157 . As it is possible to observe, both the full spectrum (blue) and a filtered spectrum composed of only two harmonics (orange) can efficiently populate only the first four states of the molecular cation.…”

Section: Intramolecular Charge Transfermentioning

confidence: 99%

“…The XUV spectrum is composed of four main harmonics with energies between 20 and 30 eV [see Fig. 8(a)] and therefore has the energy required to ionize the molecule and populate the first excited states of the cation 157 . In particular, a comparison with the tabulated value for the fragment yield after ionization with monochromatic light shows that the population after ionization is mainly confined to the cation ground state and its first three excited states [see Figs.…”

Section: Intramolecular Charge Transfermentioning

confidence: 99%

Charge migration and charge transfer in molecular systems

Wörner

Arrell

Banerji

et al. 2017

Structural Dynamics

188

163

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The transfer of charge at the molecular level plays a fundamental role in many areas of chemistry, physics, biology and materials science. Today, more than 60 years after the seminal work of R. A. Marcus, charge transfer is still a very active field of research. An important recent impetus comes from the ability to resolve ever faster temporal events, down to the attosecond time scale. Such a high temporal resolution now offers the possibility to unravel the most elementary quantum dynamics of both electrons and nuclei that participate in the complex process of charge transfer. This review covers recent research that addresses the following questions. Can we reconstruct the migration of charge across a molecule on the atomic length and electronic time scales? Can we use strong laser fields to control charge migration? Can we temporally resolve and understand intramolecular charge transfer in dissociative ionization of small molecules, in transition-metal complexes and in conjugated polymers? Can we tailor molecular systems towards specific charge-transfer processes? What are the time scales of the elementary steps of charge transfer in liquids and nanoparticles? Important new insights into each of these topics, obtained from state-of-the-art ultrafast spectroscopy and/or theoretical methods, are summarized in this review.

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Absolute dipole oscillator strengths for photoabsorption and the molecular and dissociative photoionization of ethylene

Cited by 34 publications

References 37 publications

Photo-double-ionization of ethylene and acetylene near threshold

Photo-double-ionization of ethylene and acetylene near threshold

Valence shell absolute photoabsorption oscillator strengths, constrained dipole oscillator strength distributions, and dipole properties for CH₃NH₂, (CH₃)₂NH, and (CH₃)₃N

Charge migration and charge transfer in molecular systems

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Absolute dipole oscillator strengths for photoabsorption and the molecular and dissociative photoionization of ethylene

Cited by 34 publications

References 37 publications

Photo-double-ionization of ethylene and acetylene near threshold

Photo-double-ionization of ethylene and acetylene near threshold

Valence shell absolute photoabsorption oscillator strengths, constrained dipole oscillator strength distributions, and dipole properties for CH3NH2, (CH3)2NH, and (CH3)3N

Charge migration and charge transfer in molecular systems

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Valence shell absolute photoabsorption oscillator strengths, constrained dipole oscillator strength distributions, and dipole properties for CH₃NH₂, (CH₃)₂NH, and (CH₃)₃N