Counterpropagating molecular beam scattering of NH<sub>3</sub>+ nH<sub>2</sub>

Meyer, Henning

doi:10.1080/00268979500100811

Cited by 6 publications

(5 citation statements)

References 42 publications

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“…In the past, we measured quadrupole moments of the angular momentum distribution for collisions of NH 3 and CO with He or H 2 . [40][41][42][43] In all cases, the observed differential alignment was in excellent agreement with predictions of the sudden kinematic apse ͑KA͒ or the geometric apse ͑GA͒ models proposed by Khare et al 44 The assumption of an instantaneous angular momentum transfer implies that the projection of the rotational angular momentum onto the direction of linear momentum transfer is conserved in the collision. Since this model does not invoke any interaction potential, observed deviations from this sudden limit can provide information about details of the underlying interaction.…”

Section: Introductionsupporting

confidence: 79%

Molecular beam scattering of NO+Ne: A joint theoretical and experimental study

Kim

Meyer

Alexander

2004

The Journal of Chemical Physics

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The collision dynamics of the NO+Ne system is investigated in a molecular beam scattering experiment at a collision energy of 1055 cm(-1). Employing resonance enhanced multiphoton ionization of NO, we measured state-resolved integral and differential cross sections for the excitation to various levels of both spin-orbit manifolds. The dependence of the scattered intensity on the laser polarization is used to extract differential quadrupole moments for the collision induced angular momentum alignment. The set of cross section data is compared with results of a full quantum mechanical close coupling calculation using the set of ab initio potential energy surfaces of Alexander et al. [J. Chem. Phys. 114, 5588 (2001)]. In previous work, it was found that the positions and rotational substructures for the lowest bend-stretch vibrational states derived from these surfaces agree very well with the observed spectrum of the NO-Ne complex. For the same potential, we find that the calculated cross sections show a less satisfactory agreement with the experimental data. While the overall Jf dependence and magnitude of the integral and differential cross sections are in good agreement, noticeable discrepancies exist for the angle dependence of the differential cross sections. In general, the calculated rotational rainbow structures are shifted towards larger scattering angles indicating that the anisotropy of the potential is overestimated in the fit to the ab initio points or in the ab initio calculation itself. For most states, we find the measured alignment moments to be in excellent agreement with the results of the calculation as well as with predictions of sudden models. Significant deviations from the sudden models are observed only for those fine-structure changing collisions which are dominated by forward scattering. Results of the full quantum calculation confirm the deviations for these states.

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Section: Introductionsupporting

confidence: 79%

Molecular beam scattering of NO+Ne: A joint theoretical and experimental study

Kim

Meyer

Alexander

2004

The Journal of Chemical Physics

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“…For example, from the classical results for rotational rainbow scattering of a homonuclear molecule with an atom, 20 the position of the rotational rainbow for a given j and collision energy is expected to shift towards larger scattering angles for the deuterated system. 21 The current work seeks to explore the dynamics of translational to rotational energy transfer in collisions of He with ND 3 and therefore to understand better the intermolecular interactions between these species. Measurements are reported of quantum-state resolved DCSs obtained using crossed molecular beam (CMB) scattering, [22][23][24] combined with resonance enhanced multi-photon ionization (REMPI) detection and velocity-map imaging (VMI).…”

Section: Introductionmentioning

confidence: 99%

State-to-state resolved differential cross sections for rotationally inelastic scattering of ND₃with He

Tkáč

Saha

Yang

et al. 2014

Phys. Chem. Chem. Phys.

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angular distributions. For small changes in the rotational angular momentum quantum number (j), the ND 3 is predominantly forward scattered, but the scattering shifts to the sideways and backward directions as ∆j increases. For scattering into a given ݆Ԣ ᇱ േ state, crosssections for collisions that conserve the +/-symmetry associated with the ND 3 inversion vibration are larger and generally more forward scattered than the corresponding symmetry-changing processes.

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“…Differential cross sections (DCSs) for inelastic scattering of NH3 with n-H2 were measured by Meyer [11] using counter-propagating molecular beams at a collision energy of 1177 cm -1 . Experimental and theoretical DCSs have also been reported for NH3-He [12,13] and NH3-Ar [13,14] collisions, as well as experimental DCSs for ND3-Ne scattering [15].…”

Section: Introductionmentioning

confidence: 99%

Rotationally inelastic scattering of ND₃with H₂as a probe of the intermolecular potential energy surface

et al. 2015

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Counterpropagating molecular beam scattering of NH₃+ nH₂

Cited by 6 publications

References 42 publications

Molecular beam scattering of NO+Ne: A joint theoretical and experimental study

Molecular beam scattering of NO+Ne: A joint theoretical and experimental study

State-to-state resolved differential cross sections for rotationally inelastic scattering of ND₃with He

Rotationally inelastic scattering of ND₃with H₂as a probe of the intermolecular potential energy surface

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Counterpropagating molecular beam scattering of NH3+ nH2

Cited by 6 publications

References 42 publications

Molecular beam scattering of NO+Ne: A joint theoretical and experimental study

Molecular beam scattering of NO+Ne: A joint theoretical and experimental study

State-to-state resolved differential cross sections for rotationally inelastic scattering of ND3with He

Rotationally inelastic scattering of ND3with H2as a probe of the intermolecular potential energy surface

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Counterpropagating molecular beam scattering of NH₃+ nH₂

State-to-state resolved differential cross sections for rotationally inelastic scattering of ND₃with He

Rotationally inelastic scattering of ND₃with H₂as a probe of the intermolecular potential energy surface