By John, editor Ross

ISBN-10: 0470143568

ISBN-13: 9780470143568

ISBN-10: 0470736771

ISBN-13: 9780470736777

The Advances in Chemical Physics sequence presents the chemical physics and actual chemistry fields with a discussion board for severe, authoritative reviews of advances in each sector of the self-discipline. choked with state of the art study suggested in a cohesive demeanour now not discovered somewhere else within the literature, each one quantity of the Advances in Chemical Physics sequence serves because the ideal complement to any complicated graduate type dedicated to the learn of chemical physics.


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Extra resources for Advances in Chemical Physics: Molecular Beams, Volume 10

Example text

For this reason, it is necessary to consider the extent to which inelastic scattering modifies the total cross section. In addition, it is necessary to assume an analytical form for the potential in order to obtain potential energy information from measured values of the total cross section. ”-23 The classical analysis of an elastic collision applies the conservation of energy and angular momentum to a system consisting of a beam particle of mass mi approaching a target atom of mass mz with an initial relative velocity or.

E. JOORDAN and rotational motion of the scattering molecule is neglected during the very short effective time of its interaction (10-'5-10-'4 sec) with the high-velocity beam atom, so that the potential energy associated with the collisions is assigned to a single atom-molecule orientation. It is further assumed that this potential is the sum of the potentials between the beam atom and each of the constituent atoms in the molecule. Since the molecules in the scattering volume will present all orientations to the beam atoms, the experimental potential is thus an average of the atom-molecule potential for a specified orientation both with respect to beam-detector geometry and the beam atom-scattering molecule geometry.

Even with these simplifications, the final integration must be performed numerically. The case where a narrow detector is placed in the center of a much wider beam is also of At first glance, this arrangement appears to offer extremely narrow resolution, but this is actually not the case, because the net decrease in the measured beam flux is sensitive to scattering back to the detector. The net decrease depends primarily on the beam size and only slightly on the detector size so that the value of (6;zfs) for this detector geometry is nearly the same as in the case where the detector is the same size as the beam.

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Advances in Chemical Physics: Molecular Beams, Volume 10 by John, editor Ross

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