Direct spectroscopic determination of the degree of orientation of parity-selected NO

Lange, M.J.L. de; Leuken, J.J. van; Drabbels, Marcel; Bulthuis, J.; Snijders, J.G.; Stolte, S.

doi:10.1016/s0009-2614(98)00865-3

Cited by 17 publications

(12 citation statements)

References 18 publications

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“…The 2:1 intensity ratio of the Q 11 (0.5) to the R 21 (0.5) peak reflects the Hönl-London factors of these transitions. It clearly indicates, that the transitions are not saturated, a fundamental condition necessary to deduce the degree of orientation from the line intensities in the LIF spectrum [44].…”

Section: Resultsmentioning

confidence: 96%

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Orienting polar molecules without hexapoles: Optical state selection with adiabatic orientation

Schäfer

Bartels

Hocke

et al. 2012

Chemical Physics Letters

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A pedagogic review of technology used to orient polar molecules is presented to place in context the report of a new approach to this problem. Laboratory frame orientation of polar molecules is achieved by state-specific optical pumping in a region free of electric fields followed by adiabatic transport into a static electric field. This approach overcomes some of the limitations of the more common hexapole focusing method. In particular the method is nearly insensitive to the kinetic energy of the sample. We demonstrate production of oriented samples of NO (l el = 0.15 D) with translational energies above 1 eV in both high-and low-field seeking states. The method can be extended to many other classes of molecules, including near symmetric tops and ions.

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Section: Resultsmentioning

confidence: 96%

“…(10). The degree of orientation in the electric field can be deduced by spectroscopic methods following the work of de Lange et al [44]. This method relies on the parity selection rules…”

Section: Resultsmentioning

confidence: 99%

Orienting polar molecules without hexapoles: Optical state selection with adiabatic orientation

Schäfer

Bartels

Hocke

et al. 2012

Chemical Physics Letters

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“…The coefficients describing this superposition have been experimentally deduced from measurements of LIF intensities of field-induced transitions. 4 The scattered NO molecules are monitored as a function of final quantum state via LIF, using the frequency doubled ͑ϳ226 nm͒ output of a Nd:YAG ͑YAG-yttrium aluminum garnet͒ pumped dye laser operating at 10 Hz. The pulse energy of the laser is typically several hundreds of microjoules and the frequency bandwidth is 0.15 cm Ϫ1 ͑full width at half maximum͒.…”

Section: Methodsmentioning

confidence: 99%

“…Additionally, it is possible to select a single rotational and ⌳-doublet state of NO from a molecular beam with a hexapole state selector, and subsequently to orient the axis of the state-selected NO molecule in the laboratory frame by application of a static electric field. [1][2][3][4] Scattering from such a prepared state per-scattering, that is, the difference in scattering efficiency between collisions on the N and O ends of the molecule. 4 -6 The NO-Ar system has been the most thoroughly investigated of the NO rare gas collision systems.…”

Section: Introductionmentioning

confidence: 99%

Steric asymmetry and lambda-doublet propensities in state-to-state rotationally inelastic scattering of NO(2Π1/2) with He

Lange

Stolte

Taatjes

et al. 2004

The Journal of Chemical Physics

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Relative integrated cross sections are measured for rotationally inelastic scattering of NO(2Pi(1/2)),hexapole selected in the upper lambda-doublet level of the ground rotational state (j = 0.5), in collisions with He at a nominal energy of 514 cm(-1). Application of a static electric field E in the scattering region, directed parallel or antiparallel to the relative velocity vector v, allows the state-selected NO molecule to be oriented with either the N end or the O end towards the incoming He atom. Laser-induced fluorescence detection of the final state of the NO molecule is used to determine the experimental steric asymmetry, [formula: see text], which is equal to within a factor of (- 1) to the molecular steric effect, S(i-->f) is identical with (sigma(He-->NO) - (sigma(He-->ON))/(sigma(He-->NO) + sigma(He-->ON)). The dependence of the integral inelastic cross section on the incoming lambda-doublet component is also observed as a function of the final rotational (j'), spin-orbit (omega'), and lambda-doublet (epsilon') state. The measured steric asymmetries are significantly larger than previously observed for NO-Ar scattering, supporting earlier proposals that the repulsive part of the interaction potential is responsible for the steric asymmetry. In contrast to the case of scattering with Ar, the steric asymmetry of NO-He collisions is not very sensitive to the value of omega'. However, the lambda-doublet propensities are very different for [omega=0.5(F1)-->omega'= 1.5(F2)] and [omega=0.5(F1)-->omega'=0.5(F1)] transitions. Spin-orbit manifold conserving collisions exhibit a propensity for parity conservation at low deltaj, but spin-orbit manifold changing collisions do not show this propensity. In conjunction with the experiments, state-to-state cross sections for scattering of oriented NO(2Pi) molecules with He atoms are predicted from close-coupling calculations on restricted coupled-cluster methods including single, double, and noniterated triple excitations [J. Klos, G. Chalasinski, M. T. Berry, R.Bukowski, and S. M. Cybulski, J. Chem. Phys. 112, 2195 (2000)] and correlated electron-pair approximation [M. Yang and M. H. Alexander, J. Chem. Phys. 103, 6973 (1995)] potential energy surfaces. The calculated steric asymmetry S(i-->f) of the inelastic cross sections at Etr= 514 cm(-1) is in reasonable agreement with that derived from the present experimental measurements for both spin-manifold conserving (F1-->Fl) and spin-manifold changing (F1 --F2) collisions, except that the overall sign of the effect is opposite. Additionally, calculated field-free integral cross sections for collisions at Etr = 508 cm(-1) are compared to the experimental data of Joswig et al. [J. Chem. Phys.85, 1904 (1986)]. Finally, the calculated differential cross section for collision energy Etr= 491 cm(-1) is compared to experimental data of Westley et al. [J. Chem. Phys. 114, 2669 (2001)] for the spin-orbit conserving transition F1 (j = 0.5) -F1f (j' = 3.5).

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“…It is well known that this dependence can be well approximated by using a two-level model. 44 Since NO (X 2 , ) has a large spin-orbit splitting (123 cm −1 ), the interaction between two spin-orbit states ( = 1/2 and = 3/2) is weak. As a consequence, the NO (X 2 ) states can be approximated as Hund's case (a) coupling.…”

Section: A Orientational Distribution Of the Oriented No Beammentioning

confidence: 99%

Stereo correlated dynamics in the energy transfer process of aligned N2 (A 3Σu+) + oriented NO (X 2Π, Ω = 1/2) → NO (A 2Σ+) + N2 (X 1Σg+)

Ohoyama

Maruyama

2012

The Journal of Chemical Physics

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Steric effect for the NO (A (2)Σ(+)) formation in the aligned N(2) (A (3)Σ(u)(+)) + oriented NO (X (2)Π, Ω = 1∕2) reaction has been observed as a function of the mutual orientational configurations between the two molecular reactants in the collision frame. Multidimensional molecular steric opacity function has been determined. A significant NO (X (2)Π) alignment dependence is recognized in contrast with little dependence on NO (X (2)Π) orientation. The NO alignment selectivity turns out to depend on the N(2) (A (3)Σ(u)(+)) alignment: The axial configuration of NO (X (2)Π) is favorable for the axial and sideways configurations of N(2) (A (3)Σ(u)(+)), while the sideways configuration of NO (X (2)Π) is favorable for the oblique configuration of N(2) (A (3)Σ(u)(+)) at an orientation angle of θ(v(R)) ∼ 45°. with respect to the relative velocity (v(R)).

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Direct spectroscopic determination of the degree of orientation of parity-selected NO

Cited by 17 publications

References 18 publications

Orienting polar molecules without hexapoles: Optical state selection with adiabatic orientation

Orienting polar molecules without hexapoles: Optical state selection with adiabatic orientation

Steric asymmetry and lambda-doublet propensities in state-to-state rotationally inelastic scattering of NO(2Π1/2) with He

Stereo correlated dynamics in the energy transfer process of aligned N2 (A 3Σu+) + oriented NO (X 2Π, Ω = 1/2) → NO (A 2Σ+) + N2 (X 1Σg+)

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