Diffraction oscillations in rotationally inelastic differential cross sections: HD+D2

Buck, U.; Huisken, F.; Schleusener, J.

doi:10.1063/1.435699

Cited by 48 publications

(12 citation statements)

References 7 publications

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“…For instance, diffraction oscillations and product pair correlations have already been measured for favorable systems in the 70's and 80's using ingenious high resolution scattering machines that employ rotatable detectors and time-of-flight methods. [67][68][69][70][71][72] Yet, the combination of advanced molecular beam methods and VMI as presented here offers fascinating perspectives for novel state-tostate molecular beam collision experiments that go beyond resolving diffraction oscillations alone.…”

Section: Discussionmentioning

confidence: 99%

Molecular collisions coming into focus

Vogels

Zastrow

Parker

et al. 2014

Phys. Chem. Chem. Phys.

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The Stark deceleration method exploits the concepts of charged particle accelerator physics to produce beams of neutral polar molecules with an almost perfect quantum state purity, a tunable velocity and a narrow velocity distribution. These monochromatic molecular beams offer interesting perspectives for precise studies of molecular scattering processes, in particular when used in conjunction with state-of-the-art laser-based detection techniques such as velocity map imaging. Here, we describe crossed beam scattering experiments in which the Stark deceleration method is combined with the velocity map imaging technique. The narrow velocity spread of Stark-decelerated molecular beams results in scattering images with unprecedented velocity and angular resolution. We demonstrate this by resolving quantum diffraction oscillations in state-to-state inelastic differential scattering cross sections for collisions between NO radicals and rare gas atoms. We describe the future prospects of this "best-of-two-worlds" combination, ranging from scattering studies at low collision energies to bimolecular scattering using two decelerators, and discuss the challenges that lie ahead to achieve these goals.

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Section: Discussionmentioning

confidence: 99%

Molecular collisions coming into focus

Vogels

Zastrow

Parker

et al. 2014

Phys. Chem. Chem. Phys.

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“…[11][12][13][14] These diffraction oscillations are the finest structures occurring in a DCS, and they are one of the most sensitive gauges for the PES. 15,16 We developed a new ab initio PES for NO-D 2 that predicts state-to-state scattering cross sections in excellent agreement with the experimental observations.…”

Section: Introductionmentioning

confidence: 77%

Imaging diffraction oscillations for inelastic collisions of NO radicals with He and D2

Jongh¹,

Karman²,

Vogels³

et al. 2017

The Journal of Chemical Physics

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We present state-to-state differential cross sections for collisions of NO molecules (XΠ,j=1/2,f) with He atoms and ortho-D (j = 0) molecules as a function of collision energy. A high angular resolution obtained using the combination of Stark deceleration and velocity map imaging allows for the observation of diffraction oscillations in the angular scattering distributions. Differences in the differential cross sections and, in particular, differences in the angular spacing between individual diffraction peaks are observed. Since the masses of D and He are almost equal and since D(j = 0) may be considered as a pseudo-atom, these differences directly reflect the larger size of D as compared to He. The observations are in excellent agreement with the cross sections obtained from quantum close-coupling scattering calculations based on accurate ab initio NO-He and NO-D potential energy surfaces. For the latter, we calculated a new NO-D potential energy surface.

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“…In a simplified hard-sphere model, the spacing of the diffraction oscillations ∆θ in atom-molecular collisions is approximately given by π/(kb), where k is the wavenumber. 66 The oscillation period would be smaller for a collision system with a larger reduced mass at the same collision energy.…”

Section: Discussionmentioning

confidence: 99%

Rotationally inelastic scattering of methyl radicals with Ar and N2

Tkáč

Stei

Orr-Ewing

et al. 2015

The Journal of Chemical Physics

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Articles you may be interested inThe rotationally inelastic scattering of methyl radical with Ar and N 2 is examined at collision energies of 330 ± 25 cm −1 and 425 ± 50 cm −1 , respectively. Differential cross sections (DCSs) were measured for different final n ′ rotational levels (up to n ′ = 5) of the methyl radicals, averaged over k ′ sub-levels, using a crossed molecular beam machine with velocity map imaging. For Ar as a collision partner, we present a newly constructed ab initio potential energy surface and quantum mechanical scattering calculations of state-resolved DCSs. These computed DCSs agree well with the measurements. The DCSs for both Ar and N 2 collision partners are strongly forward peaked for all spectroscopic lines measured. For scattering angles below 60 • , the theoretical CD 3 -Ar DCSs show diffraction oscillations that become less pronounced as n ′ increases, but these oscillations are not resolved experimentally. Comparisons are drawn with our recently reported DCSs for scattering of methyl radicals with He atoms. C 2015 AIP Publishing LLC. [http://dx

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Diffraction oscillations in rotationally inelastic differential cross sections: HD+D2

Abstract: Differential cross sections are measured for rotational transitions j=0 to j′=0, 1 of HD+D2. Diffraction oscillations are resolved in the inelastic channel. (AIP)

Cited by 48 publications

References 7 publications

Molecular collisions coming into focus

Molecular collisions coming into focus

Imaging diffraction oscillations for inelastic collisions of NO radicals with He and D2

Rotationally inelastic scattering of methyl radicals with Ar and N2

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