Mean lifetime of the bound 2<i>p</i>σ state of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="normal">HeH</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>

Ben‐Itzhak, I.; Chen, Z; Esry, B. D.; Gertner, I.; Heber, O.; Lin, C. D.; Rosner, B.

doi:10.1103/physreva.49.1774

Cited by 26 publications

(14 citation statements)

References 14 publications

(16 reference statements)

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“…Thus, a sensitivity to the CEP is expected for field-dependent processes such as photoionization [9,10] and harmonic generation [11]. However, for atoms and symmetric molecules interacting with linearly polarized pulses, the total ionization is invariant when the CEP is changed by 180 (or equivalently when the system is rotated by 180 ), due to the inversion symmetry in such systems.As the simplest heteronuclear asymmetric molecule, HeH 2 has been the subject of many experimental and theoretical works (see, e.g., [12,13], and references therein). Because of the strong nuclei repulsion, the ground state (1s) and most electronic states of HeH 2 are repulsive.…”

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confidence: 99%

“…As the simplest heteronuclear asymmetric molecule, HeH 2 has been the subject of many experimental and theoretical works (see, e.g., [12,13], and references therein). Because of the strong nuclei repulsion, the ground state (1s) and most electronic states of HeH 2 are repulsive.…”

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confidence: 99%

“…Because of the strong nuclei repulsion, the ground state (1s) and most electronic states of HeH 2 are repulsive. The lowest electronic bound state of HeH 2 is the first excited state 2p, whose potential curve has a minimum 0.849 eV deep at the internuclear distance of 3:89a 0 [13].…”

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confidence: 99%

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Phase Dependence of Enhanced Ionization in Asymmetric Molecules

2005

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We study enhanced ionization (EI) in asymmetric molecules by solving the 3D time-dependent Schrödinger equation for HeH2+ driven by a few-cycle laser pulse linearly polarized along the molecular axis. We find that EI is much stronger when the laser's carrier-envelope phase is such that the electric field at the peak of the pulse is antiparallel to the permanent dipole of the molecule (PDM). This phase dependence is explained by studying the molecule in the presence of a static electric field. When this field is antiparallel to the PDM, the energy of the dressed ground state moves up (with increasing internuclear distance R) to cross with excited states, leading to a stronger ionization via intermediate state resonances and via tunneling. We predict analytically the laser and molecular parameters at which these crossings are expected to occur in any asymmetric molecule.

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Phase Dependence of Enhanced Ionization in Asymmetric Molecules

2005

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“…The state is metastable. For the free molecular ion, such a metastable state was first predicted theoretically-within the Born-Oppenheimer approximation-by Bates and Carson 21 six decades ago and first confirmed experimentally only two decades ago by Ben-Itzhak et al 22,23 Interestingly enough, this metastable state appears also under dihedral confinement conditions, as discussed before. In this case, a shallower minimum dip in the potential energy appears as the dihedral confining angle decreases from ϕ 0 ¼ 2π to ϕ 0 ¼ 3π=2 (see Fig.…”

Section: Molecular Potential Energy Curvesmentioning

confidence: 83%

The Hydrogen H2+ and HeH2+ Molecular Ions Confined in Dihedral Angles

Cruz¹,

Ley‐Koo²

2015

Advances in Quantum Chemistry

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“…Such a conclusion is in accord with decay by dipole transitions from a bound or metastable excited state to a rapidly dissociating state. In such cases small changes in the energy of the vibrational states lead to much smaller changes in the transition rates (see, for example, calculations for the HeH + system [5]). …”

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Isotopic effect of the mean lifetimes of theNeAr2+doubly charged rare-gas dimer

et al. 1995

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It has been suggested recently by Chen et al. [Phys. Rev. A 49, 3472 (1994)] that the measured long-lived NeAr + formed in fast NeAr+ + Ar charge-stripping collisions is mostly in its v = 12 vibrational state bound to the electronic ground state, and that this molecular ion decays by tunneling through the potential barrier.Such a decay rate is expected to depend strongly on the reduced mass of the molecular ion leading to large isotopic effects. We have measured the mean lifetimes of the Ne Ar + and Ne Ar + isotopes in order to see this isotopic effect. Surprisingly, the mean lifetimes of both isotopes are similar to each other. Thus, it is suggested that the observed NeAr + molecular ions do not decay via a tunneling mechanism, which would indicate that they reside in the metastable electronic ground state. Rather, electronic transitions from bound or metastable excited states into other repulsive states are the origin for the experimentally observed decay.Qualitative estimates for the shapes and ordering of these states in the electronic spectrum of NeAr + are given.PACS number (s): 31.50.+w, 34.50.Gb, 33.15. Ta, 39.10.+j The first long-lived state of the NeAr + molecular ion was recently discovered in charge-stripping collisions of 900-KeV NeAr+ projectiles with Ar atoms, and its mean lifetime was determined to be 275+ 25 ns by Ben-Itzhak, Gertner, and Rosner [1].Following this measurement Koch, Frenking, and Gobbi [2] have performed ab initio calculations of the electronic ground state of NeAr + and found a rather deep local minimum. They have suggested that this long-lived molecular ion is formed in this metastable ground state. In a very recent paper, Chen et al. [3] have reported phase-shift calculations of the energies and resonance widths of the vibrational states bound in this potential well. The calculated tunneling decay rates differ by more than three orders of magnitude from one vibrational state to the other.Only the v = 12 vibrational state has a mean lifetime that is close enough to the experimental value, even though it is still underestimating the experimental value by about a factor of 3. This small discrepancy was attributed to an inaccuracy in the potential energy curve of the order of a few meV. It was concluded by Chen et al. that the long-lived NeAr + molecular ion was formed in the v = 12 vibrational state of the electronic ground state. Such highly excited vibrational states are expected to be populated by vertical transitions, because the two molecular ions involved have significantly different equilibrium internuclear distances.One of the parameters to which the transition rates are most sensitive in a tunneling process is the reduced mass of the decaying system. Although the electronic potential energy curves do not depend on the masses of the atoms in the molecule, the energies of the vibrational states, which in turn determine the mean lifetime, do. This dependence of the Present address:

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Mean lifetime of the bound 2pσ state ofHeH2+

Cited by 26 publications

References 14 publications

Phase Dependence of Enhanced Ionization in Asymmetric Molecules

Phase Dependence of Enhanced Ionization in Asymmetric Molecules

The Hydrogen H2+ and HeH2+ Molecular Ions Confined in Dihedral Angles

Isotopic effect of the mean lifetimes of theNeAr2+doubly charged rare-gas dimer

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