Photoelectron angular distribution of simple molecules at 30.4 nm photons

A new development of electrostatic lenses for ion and/or electron trajectory focusing has been implemented in a double velocity spectrometer which combines time of flight resolved coincidence and imaging techniques using fast position sensitive detectors. Ions and electrons produced by photoionization are extracted from the interaction region by a unique uniform electrostatic field, while the electrostatic lenses create a nonuniform field outside the extraction region. The space focusing reducing the effect of the finite dimensions of the interaction region on one side, and the global bending of the ion and/or electron trajectories preserving the time of flight information on the other side, enable a significant improvement of the resolution of the three measured velocity components for each particle. Such a device is particularly well adapted for the study of vector correlations in dissociative photoionization of simple molecules in the vacuum ultraviolet photon energy range. The gain achieved in the energy resolution of the processes by ion-electron kinetic energy correlation, as well as in the polar and azimuthal angle resolution in the I( e , e ) molecular frame photoelectron angular distributions, is illustrated on the example of dissociative photoionization of the NO molecule.

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“…The spatial distribution for each vibrational level reflects the ␤ e Ϸ0.9 asymmetry parameter measured for this DPI process. 14,21,22 …”

Section: B Focusing Of the Photoion Trajectories: Dissociative Photomentioning

confidence: 99%

Ion–electron velocity vector correlations in dissociative photoionization of simple molecules using electrostatic lenses

Lebech

Houver

Dowek

2002

Review of Scientific Instruments

123

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“…Measured photoelectron asymmetry parameters of Katsumata et a/. 34 at 21.2 and40.8 eV are also shown in Figs. 4(a) and4(b).…”

Section: Resultsmentioning

confidence: 78%

Multiplet-specific shape resonant features in vibrationally resolved 3σg photoionization of O2

Braunstein

McKoy

1989

The Journal of Chemical Physics

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We report multiplet-specific vibrationally resolved photoionization cross sections and photoelectron angular distributions for the 3u 8 orbital of 0 2 leading to the v+ = 0-3 levels of the b 4 .1: 8 -and B 2 .1: 8 -states ofOt. These studies were motivated by recent work which shows significant nonstatistical behavior in the vibrationally unresolved spectrum at low photoelectron energies arising from the sensitivity of the ku u shape resonance to the multipletspecific exchange potentials. In addition to the anticipated non-Franck -Condon vibrational distributions arising from the kuu shape resonance, we also find substantial nonstatistical effects in our vibrationally resolved cross sections and particularly in our photoelectron angular distributions over a broad energy range. Extensive electronic autoionization due to Rydberg levels leading to the c 4 .l:u-(2u; 1 ) ion makes it difficult to assess these effects in the available experimental data.

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“…1, was recorded using the photon energy 67 eV. This spectrum is in all parts similar to spectra recorded previously using both HeI and HeII radiation as well as synchrotron radiation [1][2][3][4][5][6][7][8] in this photon energy range. In the outer valence region, four strong photoelectron bands can be observed and associated essentially with transitions to single-hole states in the cation, whereas two weak bands observed at 13.8 and 17 eV can be assigned as CI satellites.…”

Section: Resultsmentioning

confidence: 98%

“…Refs. [1][2][3][4][5][6][7][8] and references therein) and theoretically taking electron correlation into account (e.g. Refs.…”

Section: Introductionmentioning

confidence: 99%

Cationic Rydberg states observed in resonantly enhanced electron spectra of CS2

et al. 2009

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Photoelectron angular distribution of simple molecules at 30.4 nm photons

Cited by 53 publications

References 21 publications

Ion–electron velocity vector correlations in dissociative photoionization of simple molecules using electrostatic lenses

Ion–electron velocity vector correlations in dissociative photoionization of simple molecules using electrostatic lenses

Multiplet-specific shape resonant features in vibrationally resolved 3σg photoionization of O2

Cationic Rydberg states observed in resonantly enhanced electron spectra of CS2

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