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Issue 2, 2014
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State-to-state resolved differential cross sections for rotationally inelastic scattering of ND3 with He

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Abstract

State-to-state differential cross sections are reported for rotationally inelastic scattering of fully state-selected ND3 (jk± = 11) with He. Experimental measurements are compared with full close-coupling quantum-mechanical scattering calculations that used an ab initio potential energy surface. Results are presented for final states up to jk± = 77 at a mean collision energy of 430 cm−1. For selected final quantum states, the effect of collision energy on the differential cross sections is also explored in the range 230–720 cm−1. For the experimental studies, a hexapole electrostatic lens was used for the jk± state-selection of ND3 molecules in their electronic and vibrational ground states in a molecular beam. This state-selected molecular beam was then crossed with a beam of He atoms. The velocities of inelastically scattered ND3 molecules in single jk± states were obtained by velocity map imaging, and converted to differential cross sections in the centre-of-mass frame by density-to-flux transformation. The close-coupling calculations reproduce well the measured angular distributions. For small changes in the rotational angular momentum quantum number (j), the ND3 is predominantly forward scattered, but the scattering shifts to the sideways and backward directions as Δj increases. For scattering into a given jk± state, cross-sections for collisions that conserve the ± symmetry associated with the ND3 inversion vibration are larger and generally more forward scattered than the corresponding symmetry-changing processes.

Graphical abstract: State-to-state resolved differential cross sections for rotationally inelastic scattering of ND3 with He

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Publication details

The article was received on 21 Aug 2013, accepted on 24 Sep 2013 and first published on 25 Sep 2013


Article type: Paper
DOI: 10.1039/C3CP53550A
Citation: Phys. Chem. Chem. Phys., 2014,16, 477-488
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    State-to-state resolved differential cross sections for rotationally inelastic scattering of ND3 with He

    O. Tkáč, A. K. Saha, J. Onvlee, C. Yang, G. Sarma, C. K. Bishwakarma, S. Y. T. van de Meerakker, A. van der Avoird, D. H. Parker and A. J. Orr-Ewing, Phys. Chem. Chem. Phys., 2014, 16, 477
    DOI: 10.1039/C3CP53550A

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