Excitation of Molecular Hydrogen in Intense Laser Fields

Helm, H.; Dyer, Mark J.; Bissantz, H.; Huestis, D. L.

doi:10.1007/978-1-4615-3364-1_11

Cited by 2 publications

(2 citation statements)

References 19 publications

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“…We will discuss this latter problem in more detail at the end of this paper. In addition, laser excitation to molecular Rydberg states resulting in neutral dissociation to atomic fragments and its competition with ionization was already shown by recording photoelectron spectra at different wavelengths (310-330 nm) in [17]. However, a full physical interpretation of figure 5 is beyond the scope of this paper.…”

Section: Resultsmentioning

confidence: 86%

Neutral dissociation of hydrogen molecules in a strong laser field through superexcited states

Azarm¹,

Song²,

Liu³

et al. 2011

J. Phys. B: At. Mol. Opt. Phys.

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Fragmentation of hydrogen molecules in a strong laser field is studied experimentally and theoretically. Balmer lines (n→2) from hydrogen atoms are observed up to n = 14. The emission intensity of the two strongest Balmer lines versus laser intensity in a log-log plot gives a slope of more than 11. This indicates that some high-lying states in the continuum are excited resulting in neutral dissociation. Adapting Rydberg state approximation, the potential energy curves of superexcited states of hydrogen are plotted. Semi-empirical calculation confirms dissociation through these superexcited states. The upper limit of the lifetime of the superexcited states is obtained by an ultrafast pump and probe experiment by monitoring one of the fluorescence lines.

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Section: Resultsmentioning

confidence: 86%

Neutral dissociation of hydrogen molecules in a strong laser field through superexcited states

Azarm¹,

Song²,

Liu³

et al. 2011

J. Phys. B: At. Mol. Opt. Phys.

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“…the 12th photon generate further Rydberg transitions into B and B" states (Isugnpu,). The Rydberg transitions lead therefore to the bound core of H: , the X+(lsug) state, whereas the valence state transitions should lead to the repulsive A'(2puu) state of H: after ionization (Helm 1992). We note that all Rydberg and valence states generally undergo non-adiabatic (non-radiative) mixing (see for example the GF state: Isu,3duc + 2 p u 3 as illustrated by the avoided crossing (i.e.…”

Section: Theory and Discussionmentioning

confidence: 86%

Investigation of photon emission spectra of hydrogen using intense subpicosecond Ti:sapphire/Nd:glass laser pulses

Liang¹,

Augst²,

Beaudoin³

et al. 1995

J. Phys. B: At. Mol. Opt. Phys.

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High-harmonic generation processes have been experimentally investigated in molecular hydrogen gas as both molecular dissociation and ionization occur in the gas. The high harmonics observed in our experiment can be mainly attributed to neutral hydrogen molecules. Besides the harmonic spectra, two strong Lyman lines from the dissociated hydrogen atoms and the emission from the neutral hydrogen molecules are observed. Several possible excitation and dissociation channels of hydrogen molecules are proposed. It is found that resonance effects are important for both high-harmonic generation and molecular dissociation. Theoretical calculations using the time-dependent Hartree-Fock (TDHF) method for H2 reproduce some of the resonance effects.

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Excitation of Molecular Hydrogen in Intense Laser Fields

Cited by 2 publications

References 19 publications

Neutral dissociation of hydrogen molecules in a strong laser field through superexcited states

Neutral dissociation of hydrogen molecules in a strong laser field through superexcited states

Investigation of photon emission spectra of hydrogen using intense subpicosecond Ti:sapphire/Nd:glass laser pulses

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