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The rotationally inelastic collisions of NO(X) with Ar, in which the NO bond-axis is oriented side-on (i.e. perpendicular) to the incoming collision partner, are investigated experimentally and theoretically. The NO(X) molecules are selected in the |j=0.5, Omega=0.5, epsilon=-1,f> state prior to bond-axis orientation in a static electric field. The scattered NO products are then state selectively detected using velocity-map ion imaging. The experimental bond-axis orientation resolved differential cross sections and integral steric asymmetries are compared with quantum mechanical calculations, and are shown to be in good agreement. The strength of the orientation field is shown to affect the structure observed in the differential cross sections, and to some extent also the steric preference, depending on the ratio of the initial e and f Lambda-doublets in the superposition determined by the orientation field. Classical and quantum calculations are compared and used to rationalise the structures observed in the differential cross sections. It is found that these structures are due to quantum mechanical interference effects, which differ for the two possible orientations of the NO molecule due to the anisotropy of the potential energy surface probed in the side-on orientation. Side-on collisions are shown to maximise and afford a high degree of control over the scattering intensity at small scattering angles (theta<90 degrees), whilst end-on collisions are predicted to dominate in the backward scattered region (theta>90 degrees).
This article was published in the following journal.
Name: The journal of physical chemistry. A
Using small-angle neutron scattering, we conducted a detailed conformational study of poly(3-alkylthiophene) solutions in deuterated dichlorobenzene. The focus was placed on addressing the influence o...
Studying the vibration of atoms is of fundamental importance and can provide critical insight for the understanding of materials behavior, such as structure and phase transition, thermodynamics, and c...
We demonstrate that the possibility of monitoring relative photoionization cross sections over a large photon energy range allows studying and disentangling shake processes and intramolecular inelasti...
We present a detailed ab-initio study of semi-classical transport in n-ZnSe using Rode's iterative method. Inclusion of ionized impurity, piezoelectric, acoustic deformation and polar optical...
The phonon dispersion of FeSi was measured by inelastic x-ray scattering. The study of its temperature evolution in the range of 100 - 300 K showed that the phonon modes soften to a different extent. ...
This study will examine the effects of postural orientation in the use of school backpacks among elementary school students.
This study is being conducted to study light scattering properties of maternal-fetal tissue.
The overall objective of this work is to identify changes in the optical properties of oral tissues to develop a non-invasive tool for the detection, diagnosis and screening of oral pathol...
The purpose of this study is to investigate if a systematic intervention with early identifying of patients with posttraumatic amnesia using a reality orientation therapy can reduce the pe...
In general, to determine the sensitivity of light transport to tissue from morphological features of clinical significance. Determine how specific structural features contribute to light ...
The interactions of particles responsible for their scattering and transformations (decays and reactions). Because of interactions, an isolated particle may decay into other particles. Two particles passing near each other may transform, perhaps into the same particles but with changed momenta (elastic scattering) or into other particles (inelastic scattering). Interactions fall into three groups: strong, electromagnetic, and weak. (From McGraw-Hill Encyclopedia of Science & Technology, 7th ed)
Polymers of N-SUBSTITUTED GLYCINES containing chiral centers at the a-position of their side chains. These oligomers lack HYDROGEN BONDING donors, preventing formation of the usual intrachain hydrogen bonds but can form helices driven by the steric influence of chiral side chains.
Scattering of a beam of electromagnetic or acoustic RADIATION, or particles, at small angles by particles or cavities whose dimensions are many times as large as the wavelength of the radiation or the de Broglie wavelength of the scattered particles. Also know as low angle scattering. (McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed) Small angle scattering (SAS) techniques, small angle neutron (SANS), X-ray (SAXS), and light (SALS, or just LS) scattering, are used to characterize objects on a nanoscale.
A spectroscopic technique which uses the Mossbauer effect (inelastic scattering of gamma radiation resulting from interaction with heavy nuclei) to monitor the small variations in the interaction between an atomic nucleus and its environment. Such variations may be induced by changes in temperature, pressure, chemical state, molecular conformation, molecular interaction, or physical site. It is particularly useful for studies of structure-activity relationship in metalloproteins, mobility of heavy metals, and the state of whole tissue and cell membranes.
The scattering of NEUTRONS by matter, especially crystals, with accompanying variation in intensity due to interference effects. It is useful in CRYSTALLOGRAPHY and POWDER DIFFRACTION.
Collaborations in biotechnology
Commercial and academic collaborations are used throughout the biotechnology and pharmaceutical sector to enhance research and product development. Collaborations can take the form of research and evaluation agreements, licensing, partnerships etc. ...