Electron Diffraction Studies of Clustered Nozzle Beams.
Abstract
The goal of the work outlined here is to determine the structure of atomic and molecular clusters small engough to constitute the starting or critical size for phase transitions from the vapor state (i.e. 10-100 molecules/cluster). The clusters are nucleated homogeneously from the vapor phase in the free jet expansion of a molecular beam apparatus. Their size and structure are obtained through use of high energy electron diffraction. Additional stages of differential pumping have been added in order to get the molecular beam-electron scattering chamber down to the 10 to the -8 power to 10 to the -9 power toor range. Diffraction patterns will be taken by sweeping them over a slit-phosphor scintillator-photomultiplier arrangement using magnetic coils. Conservative estimates on the minimum cluster sizes attainable using the lower pressure scattering chamber and phase sensitive detection are presented.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1975
- Accession Number
- ADA015706
Entities
People
- Gerald Saxon
- Gilbert D. Stein
- Philip R. Jeuck
Organizations
- Northwestern University