Steric asymmetry in rotationally inelastic state-resolved NOAr collisions

Leuken, J.J. van; Bulthuis, J.; Stolte, S.; Snijders, J.G.

doi:10.1016/0009-2614(96)00926-8

Cited by 57 publications

(115 citation statements)

References 17 publications

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“…In order to explore ⌳-state selected differential cross sections, a previously used crossed-beam apparatus 2,4,23,28 has been modified. The existing LIF detection system is replaced by newly designed ion optics for velocity-mapped ion-imaging.…”

Section: Methodsmentioning

confidence: 99%

“…This experiment provides the first opportunity to take a close look at the effect of parity breaking and parity conservation on the differential cross section. A hexapole state selector 22,23 is used to select the NO molecules in the low field seeking upper component of the ⌳-doublet with symmetry index ⑀ = −1. It works as a positive lens for molecules in the low field seeking component, while it diverges molecules in the high field seeking lower component of the ⌳-doublet with ⑀ =1.…”

Section: Introductionmentioning

confidence: 99%

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Differential cross sections for collisions of hexapole state-selected NO with He

Gijsbertsen

Linnartz

Rus

et al. 2005

The Journal of Chemical Physics

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122

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The first measurements of differential inelastic collision cross sections of fully state-selected NO ͑j =1/2, ⍀ =1/2, ⑀ =−1͒ with He are presented. Full state selection is achieved by a 2 m long hexapole, which allows for a systematic study of the effect of parity conservation and breaking on the differential cross section. The collisionally excited NO molecules are detected using a resonant ͑1+1Ј͒ REMPI ionization scheme in combination with the velocity-mapped, ion-imaging technique. The current experimental configuration minimizes the contribution of noncolliding NO molecules in other rotational states j , ⍀ , ⑀ -that contaminates images-and allows for study of the collision process at an unprecedented level of detail. A simple method to correct ion images for collision-induced alignment is presented as well and its performance is demonstrated. The present results show a significant difference between differential cross sections for scattering into the upper and lower component of the ⌳-doublet of NO. This result cannot be due to the energy splitting between these components.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Differential cross sections for collisions of hexapole state-selected NO with He

Gijsbertsen

Linnartz

Rus

et al. 2005

The Journal of Chemical Physics

Self Cite

122

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“…Further state selection can be achieved by optical preparation of a single quantum state or by purification of the beam with the use of electrostatic or magnetic multipole fields (2,3 ). These methods allow the orientation of the molecules to be controlled before the collision (8,9 ) and the orientation of the scattered products can be measured (10 ).…”

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confidence: 99%

Near-Threshold Inelastic Collisions Using Molecular Beams with a Tunable Velocity

Gilijamse

Hoekstra

Meerakker

et al. 2006

Science

230

268

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Molecular scattering behavior has generally proven difficult to study at low collision energies. We formed a molecular beam of OH radicals with a narrow velocity distribution and a tunable absolute velocity by passing the beam through a Stark decelerator. The transition probabilities for inelastic scattering of the OH radicals with Xe atoms were measured as a function of the collision energy in range of 50 to 400 wavenumber, with an overall energy resolution of about 13 wavenumbers. The behavior of the cross sections for inelastic scattering near the energetic thresholds was accurately measured, and excellent agreement was obtained with cross-sections derived from coupled-channel calculations on ab initio computed potential energy surfaces.The study of collisions between gas-phase atoms and molecules is a well-established method of gathering detailed information about their individual structures and mutual interaction (1 ). The level of detail obtained by these studies depends on the quality of preparation of the collision partners before the collision (2-4 ) and on how accurately the products are analyzed afterward (5-7 ). In recent years, it has become increasingly possible to control the internal and external degrees of freedom of the scattering partners, allowing the potential energy surfaces that govern the molecular collisions to be probed in ever greater detail. The most detailed information is obtained when crossed molecular beams are used to produce intense jets of molecules with a well-defined velocity, confined to only a few internal quantum states. Further state selection can be achieved by optical preparation of a single quantum state or by purification of the beam with the use of electrostatic or magnetic multipole fields (2, 3 ). These methods allow the orientation of the molecules to be controlled before the collision (8, 9 ) and the orientation of the scattered products can be measured (10 ).One of the most important parameters describing a scattering event is the collision energy of the scatterers. However, control over the collision energy has been a difficult experimental task. Since the 1980's, ingenious crossed beam machines have been engineered to vary the crossing angle of the intersecting beams, allowing variation of the collision energy while maintaining particle densities high enough for scattering (11 ). It was thereby possible to measure threshold behavior of rotational energy transfer (12, 13 ), or to tune the collision energy over the reaction barrier for reactive scattering (14, 15 ). These methods led to considerable improvement in the control over collision energy at high energiesfor example to probe short-range interactions. However, a similar level of control over collisions at low energies, which are sensitive probes for long-range interactions, is generally lacking. The angle of the 1

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“…Previous studies of inelastic scattering with Ar concentrated mostly on NO, [8][9][10][31][32][33][34][35][36][37][38][39] OH, 18,21,22,24 and HCl, 40 although scattering of a polyatomic molecule with Ar has been explored in the case of NH 3 . 41,42 Molecular nitrogen was previously used as a collider in studies of the inelastic scattering of HCl.…”

Section: Introductionmentioning

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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Steric asymmetry in rotationally inelastic state-resolved NOAr collisions

Cited by 57 publications

References 17 publications

Differential cross sections for collisions of hexapole state-selected NO with He

Differential cross sections for collisions of hexapole state-selected NO with He

Near-Threshold Inelastic Collisions Using Molecular Beams with a Tunable Velocity

Rotationally inelastic scattering of methyl radicals with Ar and N2

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