Photoelectron spectroscopy of vibrationally excited<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">H</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>(<i>E</i>,F<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi>Σ</mml:mi></mml:mrow><mml:mrow><mml:mi>g</mml:mi></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow><mm

E, Xu; Ap, Hickman; Kachru, R.; Tsuboi, Toshio; Helm, H.

doi:10.1103/physreva.40.7031

Cited by 24 publications

(20 citation statements)

References 24 publications

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“…The structure in the ionization region ͑I͒ matches photodissociation of the hydrogen ion formed in a distribution This has been seen in photoelectron spectra (the complement of our KED) by Xu et al [9]. No evidence is found for the formation of H͑n $ 3͒ fragments from the dissociation (D) process.…”

supporting

confidence: 79%

“…In the following we argue that this structure is the consequence of a direct DI process. Xu et al [9] did not report oscillations in their photoelectron spectrum, not being sensitive in the associated photoelectron energy region. The possible DI processes can be summarized as follows.…”

mentioning

confidence: 87%

“…The H͑n 2͒ could be hidden below the I peak. Also Xu et al [9] found no evidence for formation of excited H atoms due to dissociation [9]. Important for the discussion later, the absence of D fragments suggests that the doubly excited states do not play a dominant role at this wavelength.…”

mentioning

confidence: 97%

“…The introduction of intense strong laser systems made it possible to populate different intermediate high lying states via multiphoton excitation pathways, from which dissociation and ionization can be driven with less energetic photons. Experiments have been reported via the B 1 S 1 u state (using one or three photons) [6,7] and via the E, F 1 S 1 g state (using two photons) [8][9][10]. In many of these studies, doubly excited neutral states [11,12] positioned in the ionization continuum have key roles, masking the observation of direct dissociative ionization.…”

mentioning

confidence: 99%

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Observation of Direct Dissociative Ionization in Molecular Hydrogen

2001

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Direct dissociative ionization is the simplest three-body breakup process in H 2 . We describe the experimental verification of direct dissociative ionization to the repulsive A 2 S 1 u state by resolving the kinetic energy and angular distributions of the formed protons. A ͑2 1 1͒ resonant enhanced multiphoton ionization process via the isotropic E, F 1 S 1 g ͑y 6, J 0͒ level is employed. The structure in the kinetic energy spectrum is well described by a projection of the vibrational wave function of the E, F 1 S 1 g ͑y 6, J 0͒ state onto the repulsive ionic state. The electronic character of the ionization continuum is revealed by the proton angular distribution.

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supporting

confidence: 79%

mentioning

confidence: 87%

mentioning

confidence: 97%

mentioning

confidence: 99%

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Observation of Direct Dissociative Ionization in Molecular Hydrogen

2001

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“…8,12,13 Because of the v=2 R_Tdberg character of the inner-well portion of the 1 + E,F Eg, v=6 level, the photoelectron spectrum is strongly peaked at v+=2, with the v+=l, 2, 3, and 4 bands containing approximately 13%, 42%, 12%, and 12% of the total intensity, respectively. 8,13…”

Section: Introductionmentioning

confidence: 99%

<title>Competition among autoionization, predissociation, and ion-pair formation in molecular hydrogen</title>

Dehmer

Pratt

et al. 1993

SPIE Proceedings

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We have investigated autoionization, predissociation, and ion-pair formation fromlhi_hly + excited states of molecular hydrogen by using double-resonance excitation via the E,F lT.g, v=6 level. The energetic threshold for ion-pair formation occurs just below the _ X 2)".;, v+=9 iomzation threshold. The spectrum in this region was studied by using conventional and constant-ionic-state photoelectron spectroscopy, by monitoring the H" production, and by detecting dissociation products by ionization with a third laser. The decay dynamics in this region are extremely rich, because the excited levels may decay by rotational and vibrational autoionization, by predissociation to neutral H + H* (n=2,3,4), by predissociation to the ion pair H + + H', and by fluorescence.In addition, the dissociative potential curve of the 2pOu3SOg _I;+ doubly excited electronic state crosses the H_ X 2T._ potential curve in the same energy region, and the electronic autoionization of this state is found to significantly influence these decay processes.

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Laser photoelectron spectroscopy: spectroscopy and dynamics of excited states in small and medium‐sized molecules

Lange

2001

Advances in Chemical Physics

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Photoelectron spectroscopy of vibrationally excitedH2(E,FΣg+

Cited by 24 publications

References 24 publications

Observation of Direct Dissociative Ionization in Molecular Hydrogen

Observation of Direct Dissociative Ionization in Molecular Hydrogen

<title>Competition among autoionization, predissociation, and ion-pair formation in molecular hydrogen</title>

Laser photoelectron spectroscopy: spectroscopy and dynamics of excited states in small and medium‐sized molecules

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