학술논문
Mathematical model of beam intensity dispersion at the detector plane in a molecular-beam apparatus
Document Type
Journal Article
Author
Source
Rev. Sci. Instrum.; (United States); 54:3
Subject
Language
English
Abstract
A mathematical model of intensity dispersion at the detector plane in a molecular-beam apparatus has been developed for the case of a ribbon-shaped beam effusing from a narrow rectangular slit. The model is developed in terms of position probability distribution functions and Maxwellian velocity distribution functions. The relation derived for the axial flux density is nv-bar(..delta..x')(..delta..x')/4..pi../sup 2/L/sup 2/ in units of number of particles per unit area per unit time. A plot of flux density versus off-axis position agrees with the reported distributions obtained experimentally.