K-shell photoionization of CO: II. Determination of dipole matrix elements and phase differences

Cherepkov, N. A.; Raşeev, G.; Adachi, Jun‐ichi; Hikosaka, Y.; Ito, Kenji; Motoki, Shinichi; Sano, Mutsumi; Soejima, Kazutaka; Yagishita, Akira

doi:10.1088/0953-4075/33/20/302

Cited by 81 publications

(112 citation statements)

References 30 publications

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“…On the other hand, those for CO are asymmetric [2,3,5,8], due to the asymmetric nature of the hetero-nuclear diatom. Calculations employing Hartree-Fock and random-phase-approximation methods and an extension of the standard multiple scattering approach reproduce key features of the measured MF-PADs well [4,7,10].…”

mentioning

confidence: 80%

Molecular frame photoelectron angular distribution for oxygen 1s photoemission from CO₂molecules

Saitô

Ueda

Fanis

et al. 2005

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

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We have measured photoelectron angular distributions in the molecular frame (MF-PADs) for O 1s photoemission from CO 2 , using photoelectron-O + -CO + coincidence momentum imaging. Results for the molecular axis at 0, 45 and 90• to the electric vector of the light are reported. The major features of the MF-PADs are fairly well reproduced by calculations employing a relaxed-core Hartree-Fock approach. Weak asymmetric features are seen through a plane perpendicular to the molecular axis and attributed to symmetry lowering by anti-symmetric stretching motion.(Some figures in this article are in colour only in the electronic version) Photoelectron angular distributions in the molecular frame (MF-PADs) have been investigated extensively for K-shell photoemission from the diatomic molecules CO and N 2 [1-9]. The MF-PADs for molecules aligned parallel to the electric vector of the linearly polarized light exhibit rich structure in regions of shape resonances and provide a dynamical window on the underlying partial-wave composition of the photoelectron as it scatters off the anisotropic potential of the ion. It is worth noting that the observed MF-PADs for N 2 display reflection

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mentioning

confidence: 80%

Molecular frame photoelectron angular distribution for oxygen 1s photoemission from CO₂molecules

Saitô

Ueda

Fanis

et al. 2005

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

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“…At higher energies the RCHF approximation has also been used (CO 43,44,50,52,54,67,[115][116][117][118][119][120] , N 2 3 ). This is in contrast with the frozen core Hartree Fock (FCHF) approximation, which has widely been used in most earlier and some recent works (CO 42,48,58,74,75,106,121 , N 2 22,27,32,58,74,75,106 ).…”

Section: Theoretical Methods Within the Fixed-nuclei Approximationmentioning

confidence: 99%

Vibrational branching ratios in the photoelectron spectra of N2 and CO: interference and diffraction effects

Plésiat

Decleva

Martín

2012

Phys. Chem. Chem. Phys.

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Esta es la versión de autor del artículo publicado en: This is an author produced version of a paper published in: We present a detailed account of existing theoretical methods specially designed to provide vibrationally resolved photoionization cross sections of simple molecules within the Born-Oppenheimer approximation, with emphasis on newly developed methods based on density functional theory. The performance of these methods is shown for the case of N 2 and CO photoionization. Particular attention is paid to the region of high photon energies, where the electron wavelength is comparable to the bond length and, therefore, two-center interferences and diffraction are expected to occur. As shown in a recent work [Canton et al., Proc. Natl. Acad. Sci., 2011, 108, 73027306], the main experimental difficulty, which is to extract the relatively small diffraction features from the rapidly decreasing cross section, can be easily overcome by determining ratios of vibrationally resolved photoelectron spectra and existing theoretical calculations. From these ratios, one can thus get direct information about the molecular geometry. In this work, results obtained in a wide range of photon energies and for many different molecular orbitals of N 2 and CO are discussed and compared with the available experimental measurements. From this comparison, limitations and further possible improvements of the existing theoretical methods are discussed. The new results presented in the manuscript confirm that the conclusions reported in the above reference are of general validity.

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“…Electron angular distributions for molecules fixed in space by detection of the molecular fragments have been first performed by Shigemasa and coworkers with traditional analyzers for electrons and ions (Shigemasa et al 1995) (see also Shigemasa et al (1998); Watanabe et al (1997); Cherepkov et al (2000); Cherepkov et al (2000a); Ito et al (2000); Ito et al (2000a); Motoki et al (2002) for later experiments by this group). One other group has combined timeof-flight electron spectrometers (Golovin et al 1997;Heiser et al 1997;Gessner et al 2002) with imaging of the molecular fragments.…”

Section: Photoionisation Of Fixed-in-space Moleculesmentioning

confidence: 99%

Recoil-ion and electron momentum spectroscopy: reaction-microscopes

et al. 2003

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Recoil-ion and electron momentum spectroscopy is a rapidly developing technique that allows one to measure the vector momenta of several ions and electrons resulting from atomic or molecular fragmentation. In a unique combination, large solid angles close to π Microccopes -the "bubble chambers of atomic physics" -mark the decisive step forward to investigate many-particle quantum-dynamics occurring when atomic and molecular systems or even surfaces and solids are exposed to time-dependent external electromagnetic fields.The present review concentrates on just these latest technical developments and on at least four new classes of fragmentation experiments that have emerged within about the last five years. First, multi-dimensional images in momentum space brought unprecedented information on the dynamics of single-photon induced fragmentation of fixed-in-space molecules and on their structure. Second, a break-through in the investigation of highintensity short-pulse laser induced fragmentation of atoms and molecules has been achieved by using Reaction Microccopes. Third, for electron and ion-impact, the investigation of twoelectron reactions has matured to a state such that first fully differential cross sections (FDCS) are reported. Forth, comprehensive sets of FDCS for single ionisation of atoms by ion-impact, the most basic atomic fragmentation reaction, brought new insight, a couple of surprises and unexpected challenges to theory at keV to GeV collision energies. In addition, a brief summary on the kinematics is provided at the beginning. Finally, the rich future potential of the method is shortly envisaged.2

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K-shell photoionization of CO: II. Determination of dipole matrix elements and phase differences

Cited by 81 publications

References 30 publications

Molecular frame photoelectron angular distribution for oxygen 1s photoemission from CO₂molecules

Molecular frame photoelectron angular distribution for oxygen 1s photoemission from CO₂molecules

Vibrational branching ratios in the photoelectron spectra of N2 and CO: interference and diffraction effects

Recoil-ion and electron momentum spectroscopy: reaction-microscopes

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K-shell photoionization of CO: II. Determination of dipole matrix elements and phase differences

Cited by 81 publications

References 30 publications

Molecular frame photoelectron angular distribution for oxygen 1s photoemission from CO2molecules

Molecular frame photoelectron angular distribution for oxygen 1s photoemission from CO2molecules

Vibrational branching ratios in the photoelectron spectra of N2 and CO: interference and diffraction effects

Recoil-ion and electron momentum spectroscopy: reaction-microscopes

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Molecular frame photoelectron angular distribution for oxygen 1s photoemission from CO₂molecules

Molecular frame photoelectron angular distribution for oxygen 1s photoemission from CO₂molecules