Journal ArticleDOI
Angular momentum polarization produced by molecule–surface collisions in a Knudsen flow
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In this paper, the change in the flow due to molecular precession around an external magnetic field was investigated by studying the change of the flow in a flowing Knudsen gas, and the results suggest a strong correlation between type of polarization produced and molecular structure.Abstract:
In a flowing Knudsen gas, molecular angular momentum polarization can be produced by tangential forces resulting from nonspherical molecule–surface interaction. This is investigated by studying the change in the flow due to molecular precession around an external magnetic field. Various types of polarization are observed in CH4, N2, and HD flowing through a Au‐plated channel. The results suggest a strong correlation between type of polarization produced and molecular structure. These data call for model calculations which include surface corrugation.read more
Citations
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Direct inelastic scattering of N2 from Ag(111). I. Rotational populations and alignment
TL;DR: The rotational state populations and the quadrupole and hexadecapole alignment moments of N2 scattered off clean Ag(111) are determined by resonance enhanced multiphoton ionization (REMPI) in this article.
Journal ArticleDOI
Direct inelastic scattering of N2 from Ag(111). II. Orientation
TL;DR: In this paper, the orientation of the angular momentum of N2 scattered from clean Ag(111) is determined by resonanceenhanced multiphoton ionization, i.e., the net helicity or handedness of the sense of rotation.
Journal ArticleDOI
Rotational polarization produced by molecule/LiF (001) collisions in a Knudsen particle flow between 78 and 695 K
R. Horne,L. J. F. Hermans +1 more
TL;DR: In this article, the magnetic field effect on a Knudsen flow at temperatures between 78 and 695 K is investigated by studying the molecular angular momentum polarization produced in molecule-surface interaction.
Journal ArticleDOI
Role of corrugation in molecule-surface interaction : flow experiments using the liF (001) surface in two orientations
R. Horne,L.J.F. Hermans +1 more
TL;DR: In this article, the role of surface corrugation in molecule-surface interaction is studied in Knudsen flow of H 2, HD and N 2 along LiF(001) surfaces under different azimuth angles.
Journal ArticleDOI
Molecular alignment in gaseous flow-detected by molecular fragmentation following electron impact double ionization
H P Neitzke,R Terlutter +1 more
TL;DR: In this article, a new technique for the analysis of molecular targets with respect to the alignment of the axes of the molecules is described, where ionic fragments from the decay of doubly charged ions created by electron impact are detected in coincidence.
References
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Journal ArticleDOI
Gas—surface interactions and dynamics; Thermal energy atomic and molecular beam studies
J.A. Barker,Daniel J. Auerbach +1 more
TL;DR: In this article, a review of recent advances in the use of thermal energy atomic and molecular beam methods to explore the dynamics of physical and chemical processes occuring at surfaces is presented.
Proceedings of the second international symposium on rarefied gas dynamics
TL;DR: In this article, rarefied gas dynamics was studied for free-molecular flow and molecular beams and surface interactions in the context of free molescular flow, free molecular flows and kinetic theory.
Journal ArticleDOI
Observation of rotational polarization produced in molecule-surface collisions
TL;DR: In this paper, the rotational polarization produced by scattering a rotationally cold beam of NO from Ag(111) has been measured by laser-induced fluorescence, and a strong rotationational polarization perpendicular to the surface normal is observed.
Journal ArticleDOI
Transport phenomena in molecular Knudsen gas
H.F.P. Knaap,I. Kuščer +1 more
TL;DR: In this article, the transport properties of a collisionless molecular gas between plane-parallel plates are investigated by considering mass flow in two directions and heat flow in three directions, together with the five conjugate thermodynamic forces.
Journal ArticleDOI
Molecular Angular momentum polarization produced in a Knudsen flow
Abstract: In a Knudsen flow of polyatomic molecules, polarization of the angular momenta can occur due to non-spherical molecule-surface interactions. The polarization has been studied by observing a change in the particle flux caused by the precession of the molecules in an external magnetic field. It is show how the experimental results as a function of field orientation and field strength allow a determination of the type and magnitude of the polarization. The experimental technique is described and results are given for N2 flowing through a Au-coated channel at 300 K. It is found that the dominant types of polarization are Jy and JxJz, where x is the flow direction and z is the normal to the surface.