Journal ArticleDOI
Calculation of vibrational preionization in H2 by multichannel quantum defect theory: Total and partial cross sections and photoelectron angular distributions
M. Raoult,Ch. Jungen +1 more
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In this paper, the effect of vibrational preionization on the total and partial oscillator strength distributions and photoelectron angular distribution in H2 for excitation between 790 and 760 A.Abstract:
Multichannel quantum defect theory has been used to calculate the effect of vibrational preionization on the total and partial oscillator strength distributions and photoelectron angular distribution in H2 for excitation between 790 and 760 A. The total oscillator‐strength distribution obtained agrees well with the high‐resolution photoionization data of Dehmer and Chupka. The partial oscillator strength resonance profiles are predicted to have different shapes in different vibrational ionization channels, while their widths change little with channel. The preionization resonances are also predicted to affect the angular distribution asymmetry parameters b over a broader range than they affect the oscillator strength distribution. The gross features of the preionization resonances are discussed in terms of approximate solutions of the MQD equations.read more
Citations
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Quantum defect theory
TL;DR: Quantum defect theory (QDT) as mentioned in this paper is a unified theory of bound states, including series perturbations, autoionisation and electron-ion scattering, both elastic and inelastic.
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Molecular Applications of Quantum Defect Theory
TL;DR: In this paper, the authors discuss the molecular applications of quantum defect theory and display two molecular spectra exhibiting striking effects due to both preionization and predissociation, which is called autoionization or preissociation if the continuum is associated with nuclear rather than with electronic motion.
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What are the basic mechanisms of electronic transitions in molecular dynamic processes
TL;DR: In this article, the basic mechanisms of electronic transitions in molecular processes and their theoretical treatments are summarized and reviewed, and a particular emphasis is put on the non-adiabatic tunnelling process which is supposed to be an important key mechanism for state or phase change in various fields.
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Dissociative recombination of H+2, HD+, and D+2 by collisions with slow electrons
TL;DR: In this article, the authors used the multichannel quantum defect theory (MQDT) for dissociative recombination of H+2, HD+, and D+2 via the two-electron excited superexcited state 1Σg(2pσu)2 for each specified initial vibrational state vi (≲4) of molecular ions at low electron energies 0.02≲E≲1.0 eV.
Journal ArticleDOI
Resonant multiphoton ionization of H2 via the B 1Σ+u, v=7, J=2 and 4 levels with photoelectron energy analysis
TL;DR: In this paper, the photoelectron spectra of an electronically excited state of H2 (B 1Σ+u) in selected vibrational and rotational levels is reported.
References
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Journal ArticleDOI
Effects of Configuration Interaction on Intensities and Phase Shifts
TL;DR: In this paper, a theoretical analysis of the shape of the 2s2p^{1}P resonance of He observed in the inelastic scattering of electrons is presented. But the analysis is restricted to the case of one discrete level with two or more continua and of a set of discrete levels with one continuum.
Journal ArticleDOI
Quantum Defect Theory of l Uncoupling in H 2 as an Example of Channel-Interaction Treatment
TL;DR: In this paper, the details of the high-resolution photoabsorption spectrum of the H 2 near threshold observed by Herzberg were derived. Butler et al. applied Seaton's multichannel quantum defect method under schematic conditions, and might serve as a basis for further developments.
Journal ArticleDOI
Rydberg series and ionization potential of the H2 molecule
G. Herzberg,Ch. Jungen +1 more
TL;DR: In this article, the Rydberg series of ortho- and para-H2 in the region 835-765 A have been studied in absorption at low temperature under high resolution.
Journal ArticleDOI
Quantum defect theory I. General formulation
TL;DR: In this paper, a generalization of quantum defect theory for many-channel generalization is presented, where wave functions ψ(N+1) for an atomic system containing N+1 electrons are expanded in terms of products ψα(N)Fα where the ψ α(N), Fα are functions for the corresponding N-electron system and the Fα is functions for added electron.
Journal ArticleDOI
Rovibronic interactions in the photoabsorption spectrum of molecular hydrogen and deuterium: An application of multichannel quantum defect methods
Ch. Jungen,Osman Atabek +1 more
TL;DR: In this article, a multichannel quantum defect theory (MQDT) is applied to the treatment of electron motion in molecular Rydberg states and its coupling to the vibrational and rotational motions of the nuclei.
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