Glory oscillations in inelastic forward scattering for H<sup>+</sup>-H<sub>2</sub>

Krutein, J; Bischof, Günter; Linder, F.; Schinke, Reinhard

doi:10.1088/0022-3700/12/2/005

Cited by 12 publications

(8 citation statements)

References 7 publications

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“…This suggests that the vibrational inelasticity would be rather high for this system which is in accordance with the experimental observation of Krutein and Linder. 5 The experimentally observed differential cross section (DCS) 17 also shows a similar kind of behaviour for the inelastic process.…”

Section: Vibrational Coupling Matrix Elementsmentioning

confidence: 75%

“…Molecular beam experiments coupled with proton energy-loss spectroscopy have been carried out with several diatomic molecules (H 2 , N 2 , O 2 , CO, NO) and polyatomic molecules (CO 2 , SF 6 , CH 4 ). [3][4][5][6][7] These experimental results show an interesting selectivity for vibrational excitation, observed with apparently similar molecules. For example, the amount of vibrational excitation in N 2 is comparatively very low and is similar to that observed in CO and NO, but it is larger in H 2 and even larger in O 2 , in a similar range of E cm .…”

Section: Introductionmentioning

confidence: 70%

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Non-adiabatic collisions in H+ + O2 system: An ab initio study

Amaran

Kumar

2007

J Chem Sci

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An ab initio study on the low-lying potential energy surfaces of H + + O 2 system for different orientations (γ) of H + have been undertaken employing the multi-reference configuration interaction (MRCI) method and Dunning's cc-pVTZ basis set to examine their role in influencing the collision dynamics. Nonadiabatic interactions have been analysed for the 2 × 2 case in two dimensions for γ = 0°, 45°a nd 90°, and the corresponding diabatic potential energy surfaces have been obtained using the diabatic wavefunctions and their CI coefficients. The characteristics of the collision dynamics have been analysed in terms of vibrational coupling matrix elements for both inelastic and charge transfer processes in the restricted geometries. The strengths of coupling matrix elements reflect the vibrational excitation patterns observed in the state-to-state beam experiments.

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Section: Vibrational Coupling Matrix Elementsmentioning

confidence: 75%

Section: Introductionmentioning

confidence: 70%

Non-adiabatic collisions in H+ + O2 system: An ab initio study

Amaran

Kumar

2007

J Chem Sci

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“…It is interesting to compare the vibrational inelasticity in both cases. Vibrational excitation of H 2 by H + impact in forward scattering has been measured by Krutein et al [25]. They clearly observed excitation of four vibrational levels.…”

Section: B Comparison Of H--h2 N 2 and H + -H2 N Amentioning

confidence: 90%

Vibrationally inelastic scattering of H? ions from H2, N2, O2 and CO2

Hege

Linder

1985

Z Physik A

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State-resolved measurements are presented for vibrational excitation of H2, N2, 0 2 and CO 2 by H-impact in the collision energy range Ecru=20-180 eV and for scattering in the forward direction (0_+0.5~ The data obtained from the measurements are the relative intensities and differential cross sections for vibrational excitation up to v'=4, the transition probabilities P0~v" and the vibrational energy transfer A Evi b. For the systems H -H2, N2, 0 2 the vibrational inelasticity increases in the order Hz-N 2 -0 2. The mechanism for vibrational excitation in these systems is due to trajasient charge transfer from the H-ion into antibonding orbitals of the target molecule which provides a bond stretching force during the collision. For H 2 and N2, the results are compared with corresponding measurements for H + scattering where the interaction mechanism is quite different. In the case of CO 2, vibrational excitation in forward scattering is caused primarily by the long-range dipole interaction. The spectra are very similar for H--CO 2 and H + -CO 2. Finer details are attributed to the influence of transient charge transfer and valence interactions.

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“…There have also been measurements [16] of vibrational inelasticity of the "0P1 excitation for the forward scattering of protons from H at higher energies (20-120 eV), following the earlier experimental and theoretical investigations which suggested largest magnitude of differential cross sections for small scattering angle, . Measurements for forward scattering ( &0.5°) showed that vibrational inelasticity increased with the increase of collision energies.…”

Section: The Evidence For H>-h Collisionsmentioning

confidence: 98%

Interaction and dynamics of collisional energy transfers in simple ion-molecule systems

Gianturco¹,

Kumar²

1996

Z Phys D - Atoms, Molecules and Clusters

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The possible selective pathways for the excitations of vibrational and/or rotational modes of the hydrogen molecule in collisions with two, apparently simple, ionic projectiles (H> and H\) are studied in detail using quantum-mechanical coupled channels methods and a sudden-type of partial decoupling approximation discussed in the main text. The relevant potential energy surfaces (PES's) are obtained from the existing literature and an extensive comparison of their features in relation of possible outcomes from inelastic collisions is carried out. The final state-to-state inelastic cross sections, partial integral and differential, are computed and compared with earlier calculations and with the existing experiments. The behaviour of such observables, and their relations with the PES features, help us to shed light on the microscopic mechanisms of collisional energy transfers in some of the simplest ion-molecule and to underline the dynamical effects which stem from their structural differences.

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Glory oscillations in inelastic forward scattering for H⁺-H₂

Cited by 12 publications

References 7 publications

Non-adiabatic collisions in H+ + O2 system: An ab initio study

Non-adiabatic collisions in H+ + O2 system: An ab initio study

Vibrationally inelastic scattering of H? ions from H2, N2, O2 and CO2

Interaction and dynamics of collisional energy transfers in simple ion-molecule systems

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Glory oscillations in inelastic forward scattering for H+-H2

Cited by 12 publications

References 7 publications

Non-adiabatic collisions in H+ + O2 system: An ab initio study

Non-adiabatic collisions in H+ + O2 system: An ab initio study

Vibrationally inelastic scattering of H? ions from H2, N2, O2 and CO2

Interaction and dynamics of collisional energy transfers in simple ion-molecule systems

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Glory oscillations in inelastic forward scattering for H⁺-H₂