Differential cross sections for rotationally inelastic scattering of NO from He and D2

Westley, M. S.; Lorenz, K. Thomas; Chandler, David W.; Houston, Paul L.

doi:10.1063/1.1338528

Cited by 41 publications

(34 citation statements)

References 36 publications

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“…Over the scattering angles displayed in Figure 3(a) there is a close agreement between experiment and theory that suggests that the parts of the calculated PES that are sampled by the scattering experiments are largely correct for the NO(A 2 AE þ ) interaction with He atoms. A similar good agreement is seen between theory and experiment for NO(X 2 Å 1/2 )/He ground state scattering [41] as is observed here for the excited state scattering. The experimental differential cross-sections for NO(A 2 AE þ )/Ar scattering are also compared with those computed from the potential energy surface, as shown in Figure 3(c).…”

Section: Molecular Physics 1697supporting

confidence: 89%

Collisions of electronically excited molecules: differential cross-sections for rotationally inelastic scattering of NO(A²Σ⁺) with Ar and He

et al. 2012

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The paper reports experimental measurements and theoretical calculations of rotational-state-resolved differential scattering cross-sections (DCS) for collisions between electronically excited NO(A 2 AE þ ) molecules and rare gas atoms. The experimental NO(A 2 AE þ ) þ Ar and NO(A 2 AE þ ) þ He state-resolved product scattering distributions are determined using velocity-mapped ion imaging. The ion images are analysed to determine the state-resolved DCS, which are compared with new theoretical DCS calculated using quantum scattering methods on ab initio electronic potential energy surfaces. Both collision systems are imaged simultaneously; this constraint on the collision energies of the two systems aids the comparison to theory. The experimental and calculated DCS agree well for the NO(A 2 AE þ )/He system. For the NO(A 2 AE þ )/Ar scattering system, the experiments do not recover the degree of forward-scattering theoretically predicted and significant differences in the positions of the observed and predicted rotational rainbow features are apparent at large scattering angles, particularly for the most rotationally inelastic collision channels investigated: DN ¼ 12,14.

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Section: Molecular Physics 1697supporting

confidence: 89%

Collisions of electronically excited molecules: differential cross-sections for rotationally inelastic scattering of NO(A²Σ⁺) with Ar and He

et al. 2012

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“…We use the technique of velocity mapped ion imaging (25)(26)(27) to characterize the scattering distribution and density of scattered NO molecules. Our experimental apparatus has previously been used to determine the differential cross section (28) of the inelastically scattered NO molecules in NO ϩ Ar collisions.…”

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confidence: 99%

Subkelvin Cooling NO Molecules via "Billiard-like" Collisions with Argon

Elioff

Valentini

Chandler

2003

Science

165

141

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We report the cooling of nitric oxide using a single collision between an argon atom and a molecule of NO. We have produced significant numbers (108 to 109 molecules per cubic centimeter per quantum state) of translationally cold NO molecules in a specific quantum state with an upper-limit root mean square laboratory velocity of 15 plus or minus 1 meters per second, corresponding to a 406 plus or minus 23 millikelvin upper limit of temperature, in a crossed molecular beam apparatus. The technique, which relies on a kinematic collapse of the velocity distributions of the molecular beams for the scattering events that produce cold molecules, is general and independent of the energy of the colliding partner.

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“…[37][38][39][40][41][42][43] Applications to bimolecular collisions include imaging of NO inelastic scattering from He and D 2 . 44 Here we extend the method to ion-molecule reactive scattering, specifically to the Co ϩ ϩisobutane reaction:…”

Section: Introductionmentioning

confidence: 99%

Velocity map imaging of ion-molecule reaction products: Co+(3F4)+isobutane

Reichert

Thurau

Weisshaar

2002

The Journal of Chemical Physics

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The velocity map imaging technique is applied to mass-selected CoC3H6++CH4 and CoC4H8++H2 elimination products from the Co+(3F4)+isobutane reaction studied under crossed-beam conditions at 0.21 eV collision energy. For both reactions we obtain the joint scattering probability distribution P(E,Θ), where E and Θ are the product translational energy and scattering angle. The fraction of available energy deposited into product translation is 0.4 for H2, compared with 0.1 for CH4. For the CH4 product, the angular distribution is forward-backwards symmetric and sharply peaked at Θ=0 and 180°. P(E,Θ) is not separable into the product of an energy and an angular function; rather, the angular distribution peaks more sharply at higher translational energy. Evidently, incipient CoC3H6++CH4 products equilibrate in the Co+(C3H6)(CH4) exit-channel well, from which they decay statistically. The product translational energy distribution P(E) is consistent with orbiting-transition state phase-space theory with no exit-channel barrier. In addition, the energy-integrated angular distribution T(Θ) is consistent with the predictions of the early statistical complex decay model of Miller and Herschbach for fragmentation from a transition state that is a prolate top. In sharp contrast, P(E) for the CoC4H8++H2 products exhibits a substantial hot, nonstatistical tail towards high energy. Perhaps the H2 channel has a late potential energy barrier some 0.5 eV above products, but we view this explanation as highly unlikely. Instead, we suggest that the potential energy from an earlier multicenter transition state is funneled efficiently, and highly nonstatistically, into product translation. This surprising conclusion may apply to H2 products for the entire family of reactions of the late-3D series transition metal cations Fe+, Co+, and Ni+ with alkanes.

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Differential cross sections for rotationally inelastic scattering of NO from He and D2

Cited by 41 publications

References 36 publications

Collisions of electronically excited molecules: differential cross-sections for rotationally inelastic scattering of NO(A²Σ⁺) with Ar and He

Collisions of electronically excited molecules: differential cross-sections for rotationally inelastic scattering of NO(A²Σ⁺) with Ar and He

Subkelvin Cooling NO Molecules via "Billiard-like" Collisions with Argon

Velocity map imaging of ion-molecule reaction products: Co+(3F4)+isobutane

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Differential cross sections for rotationally inelastic scattering of NO from He and D2

Cited by 41 publications

References 36 publications

Collisions of electronically excited molecules: differential cross-sections for rotationally inelastic scattering of NO(A2Σ+) with Ar and He

Collisions of electronically excited molecules: differential cross-sections for rotationally inelastic scattering of NO(A2Σ+) with Ar and He

Subkelvin Cooling NO Molecules via "Billiard-like" Collisions with Argon

Velocity map imaging of ion-molecule reaction products: Co+(3F4)+isobutane

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Collisions of electronically excited molecules: differential cross-sections for rotationally inelastic scattering of NO(A²Σ⁺) with Ar and He

Collisions of electronically excited molecules: differential cross-sections for rotationally inelastic scattering of NO(A²Σ⁺) with Ar and He