Now showing items 21-26 of 26
A high intensity polarized electron source with on-line polarization analysis
This thesis describes the design, construction and operation of an intense source of polarized electrons suitable for application to most proposed scattering experiments. Polarized electrons are produced in a flowing helium ...
Extraction of a helium ion beam from an optically polarized helium source gas
Optical pumping techniques can be used to produce nuclear polarization in He3 gas excited by a weak electric discharge. By optically polarizing He3 to a polarization P0 and extracting ions from the gas, the resulting ion ...
Dynamic polarization in polymerized alkynes
A measurement Is reported of the proton polarization achieved in a polymer sample through the solid effect. The sample is a polymerized alkyne; the paramagnetism arises from free radicals trapped in the polymer structure. ...
Polarized electrons from penning ionization in a flowing helium afterglow
An experimental apparatus is described which provides a spatial decay of the excited species from a helium discharge. This "flowing afterglow" has been constructed and the helium metastable atoms He(23S1) are seen to decay ...
Effects of adsorbates and temperature on electron spin polarization in low energy electron diffraction from tungsten (001)
The electron spin polarization and intensity of the specularly reflected () low energy electron diffraction (LEED) beam at an angle of incidence = 13° have been measured as a function of up to about 1 Langmuir of exposure ...
Spin dependence of penning ionization and production of polarized electrons in a flowing helium afterglow
This dissertation describes a method to study the dependence upon electron spin orientation of ionizing (Penning) reactions of the type He(23 Sl) + X ---> He(11S0) + X+ + e- Helium metastable 23S1 atoms are spin polarized ...