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Helm, H.; Bruijn, D. P. de; Los, J.

doi:10.1103/physrevlett.53.1642

Cited by 60 publications

(16 citation statements)

References 10 publications

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“…Still, these Rydberg states have been studied starting from the long-lived metastable c 3 ⌸ u Ϫ state, which has an excitation energy of Ϸ11.6 eV, and which may be produced by low energy electron impact or using chargetransfer collisions between molecular hydrogen ions and alkali atoms, such as sodium, rubidium, or cesium. 9,10 For these reasons, most studies in triplet hydrogen have focussed on the d-gerade Rydberg series. [11][12][13] To the best of our knowledge no triplet np-ungerade Rydberg series have been detected.…”

Section: Introductionmentioning

confidence: 99%

Predissociation and autoionization of triplet Rydberg states in molecular hydrogen

Dinu

Picard

Zande

2004

The Journal of Chemical Physics

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We present single-photon spectroscopy in molecular hydrogen starting from the metastable c 3 ⌸ u Ϫ state to a number of triplet nd-Rydberg states (vϭ0 -4, nϭ12-20). Using fast beam spectroscopy both the autoionization channel and the predissociation channel are quantified, field free, as well as with small electric fields. Coupling with the i 3 ⌸ g state is assumed to be responsible for field-free predissociation of the vϭ0 Rydberg levels. The stronger observed predissociation channel of the vϭ1 Rydberg levels is due to the nonadiabatic interaction with the h 3 ⌺ g ϩ state in combination with l mixing due to an external electric field. No direct evidence is found for possible electric field induced predissociation of the gerade Rydberg states by low lying ungerade states. The competition between autoionization and predissociation is discussed in terms of possible consequences for dissociative recombination involving low energy electron collisions with the H 2 ϩ molecular ion.

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Section: Introductionmentioning

confidence: 99%

Predissociation and autoionization of triplet Rydberg states in molecular hydrogen

Dinu

Picard

Zande

2004

The Journal of Chemical Physics

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“…As expected, the same features appear as in the lower spectrum, but now with different relative intensities. The enhancement of peaks (14) and (15) indicate that the corresponding upper levels dissociate as well as ionize.…”

Section: Ionization-dissociation Branching Ratiosmentioning

confidence: 97%

“…4, allow one to estimate dissociation/ionization branching ratios for the upper levels of transitions ( 14 ) and (15). Assuming that the upper levels for transitions ( 17) and (20) ionize with unity branching ratio, one obtains an 80% dissociation branching ratio for transitions ( 14) and ( 15).…”

Section: Ionization-dissociation Branching Ratiosmentioning

confidence: 99%

Spectroscopic study of the second 3Πg state of H2 : A bound triplet state perturbed by a doubly excited state

Lembo

Bjerre

Huestis

et al. 1990

The Journal of Chemical Physics

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“…The relative differential photodissociation cross sections have been measured by means of translational spectroscopy, which has proven to be an excellent tool to investigate dissociative processes [8,16,20]. Both the kinet- beam is obtained by measuring the total d.issociation rate (irrespective of E and 8) as a function of laser wavelength.…”

Section: Theorymentioning

confidence: 99%

Resonances of thej3Δgstate in the differen

et al. 1991

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Resonances in the differential photodissociation cross section of H2 are studied. Photon excitation from the metastable c II"state occurs around resonances in the j hg state lying in the continuum of the i II~state. The j hg state is coupled to the continuum by the nuclear rotation. Since direct excitation to the continuum can also occur, interference is present, which expresses itself as a change in anisotropy of the photofragments as the photon energy is scanned over a resonance. Fano parameters, linewidths, and anisotropy parameters are obtained from the measured differential cross sections and are treated theoretically as outlined in the preceding paper Siebbeles, Phys. Rev. A 44, 1577 (1991)]. The experimental and calculated results are in good agreement.

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Fast Neutral-Beam Photofragment Spectroscopy ofH2cΠu

Cited by 60 publications

References 10 publications

Predissociation and autoionization of triplet Rydberg states in molecular hydrogen

Predissociation and autoionization of triplet Rydberg states in molecular hydrogen

Spectroscopic study of the second 3Πg state of H2 : A bound triplet state perturbed by a doubly excited state

Resonances of thej3Δgstate in the differen

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