Fast-ion-beam photoelectron spectrometer

Hanold, K.; Sherwood, Christopher R.; Garner, M. C.; Continetti, Robert E.

doi:10.1063/1.1146075

Cited by 23 publications

(30 citation statements)

References 18 publications

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“…The experimental method has been previously described in detail 32,33 and will be only briefly reviewed here. A fast beam of mass-selected negative ions (H 2 O 2 Ϫ ) was intersected with a pulsed laser beam and the kinematic properties of the photoelectron and neutral fragments were measured in coincidence.…”

Section: Methodsmentioning

confidence: 99%

Transition state dynamics of the OH+OH→O+H2O reaction studied by dissociative photodetachment of H2O2−

Deyerl

Clements

Luong

et al. 2001

The Journal of Chemical Physics

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Photoelectron-photofragment coincidence ͑PPC͒ spectroscopy has been used to study the dissociative photodetachment of H 2 O 2 Ϫ and D 2 O 2 Ϫ . The observed partitioning of photoelectron and photofragment translational energies provides information on the dynamics in the transition state region of the reaction between two hydroxyl radicals: OHϩOH→O( 3 P)ϩH 2 O. The data reveal vibrationally resolved product translational energy distributions for both the entrance channel OHϩOH and the exit channel O( 3 P)ϩH 2 O upon photodetachment. The total translational energy distribution shows a convoluted vibrational progression consistent with antisymmetric stretch excitation of H 2 O in the exit channel and OH stretch in the entrance channel. The photoelectron spectra are compared to two-dimensional time-dependent wave packet dynamics simulations based on an anharmonic potential in the anion and a model collinear potential energy surface for the neutral complex. The PPC spectra also yield the dissociation energies D 0 (H 2 O 2 Ϫ →H 2 OϩO Ϫ ) ϭ1.15Ϯ0.08 eV and D 0 (D 2 O 2 Ϫ →D 2 OϩO Ϫ )ϭ1.05Ϯ0.08 eV.

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Section: Methodsmentioning

confidence: 99%

Transition state dynamics of the OH+OH→O+H2O reaction studied by dissociative photodetachment of H2O2−

Deyerl

Clements

Luong

et al. 2001

The Journal of Chemical Physics

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“…1 Several detachment studies of this species have probed the photon energy dependence of the total detachment cross section [19][20][21][22][23][24][25][26] or reported the photoelectron spectrum of O 2 − . 1,[27][28][29][30][31][32][33][34][35][36][37][38] Until very recently, much less data were reported regarding the PAD. 1,28,35 Among other anions, the prominent dependence of photoelectron anisotropy on the final vibrational state of the neutral was reported in the photodetachment of NO − .…”

Section: Introductionmentioning

confidence: 99%

Vibronic coupling in the superoxide anion: The vibrational dependence of the photoelectron angular distribution

Duzor

Mbaiwa

Wei

et al. 2010

The Journal of Chemical Physics

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The ZCC model invokes vibrational channel specific "detachment orbitals" and attributes this behavior to coupling of the electronic and nuclear motion in the parent anion. The spatial extent of the model detachment orbital is dependent on the final state of O 2 : the higher the neutral vibrational excitation, the larger the electron binding energy. Although vibronic coupling is ignored in most theoretical treatments of PADs in the direct photodetachment of molecular anions, the present findings clearly show that it can be important. These results represent a benchmark data set for a relatively simple system, upon which to base rigorous tests of more sophisticated models.

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“…The simultaneous determination of recoil angles and kinetic energies for all three particles is achieved with this apparatus. The photoelectron [17] and photofragment translational [15] spectrometers have been described in detail previously and will only be briefly described here. Anions are produced 0031-9007͞96͞77(16)͞3335(4)$10.00 and cooled in a pulsed free jet expansion of O 2 intersected by a 1 keV electron beam.…”

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confidence: 99%

Photoelectron-Photofragment Angular Correlation and Energy Partitioning in Dissociative Photodetachment

1996

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Measurements of photoelectron-photofragment angular correlation and energy partitioning in the dissociative photodetachment of O 4 2 ͑O 4 2 1 hn ! O 2 1 O 2 1 e 2 ͒ at 532 nm are reported. Using photofragment translational energy and photoelectron spectroscopy in coincidence, vibrationally resolved product translational energy distributions and a pronounced angular correlation between the photoelectron and photofragment recoil directions are observed. These results provide insights into the molecule-fixed photoelectron angular distribution of a negative ion and structural information on O 4 2 in the gas phase. [S0031-9007 (96)01411-1] PACS numbers: 33.80.EhThe dynamics of photodetachment and photoionization processes are sensitive probes of electron-molecule interactions. Photoelectron angular distributions provide detailed information on photodetachment dynamics due to the fact that they are a function of both the magnitude and relative phases of the degenerate electron continuum channels accessible in photodetachment processes [1,2]. Studying the photoelectron angular distribution in the molecular frame provides greater insights into the photodetachment dynamics. This results from the removal of the averaging over molecular orientations inherent in a laboratory angular distribution. Theoretical studies of such moleculefixed photoelectron angular distributions (MF-PAD) have been pursued for an improved understanding of the dynamics of photoionization [1,3-6] and electron interactions with molecules oriented on surfaces [7]. Evidence of anisotropic MF-PAD's have been observed in experiments on the dissociative photoionization of H 2 [8], O 2 [9], and several halomethanes [10,11]. Direct detailed measurements of the MF-PAD in the photoionization of NO have recently been reported [5]. Measurements of the MF-PAD for the photodetachment of negative ions are of interest as they will provide insights into the nature of both the bound electron in the anion and the anisotropy of electronmolecule interaction potentials.The structure and energetics of atomic and molecular cluster anions have received considerable attention in recent years. Translational energy spectroscopy can be used to determine bond energies and photofragment internal energy distributions [12]. Photoelectron kinetic energy spectroscopy has been used to characterize vibrational and electronic states of both anionic and neutral clusters [13]. In many systems, however, photodetachment produces the neutral far from the equilibrium geometry. The repulsive energy in the cluster can then lead to rapid dissociation. To study the dissociation dynamics of such short-lived neutral clusters, it is essential to measure the photoelectron kinetic energy and the translational energy released between the atomic or molecular fragments. Such mea-surements can reveal both the internal energy distribution of the photofragments and provide a direct measure of the repulsive energy in the complex. In this Letter, we report measurements in which a complete kinematic description...

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Fast-ion-beam photoelectron spectrometer

Cited by 23 publications

References 18 publications

Transition state dynamics of the OH+OH→O+H2O reaction studied by dissociative photodetachment of H2O2−

Transition state dynamics of the OH+OH→O+H2O reaction studied by dissociative photodetachment of H2O2−

Vibronic coupling in the superoxide anion: The vibrational dependence of the photoelectron angular distribution

Photoelectron-Photofragment Angular Correlation and Energy Partitioning in Dissociative Photodetachment

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