Polarization and hyperfine transitions of metastable 129Xe in discharge cells and pressure shift of Cs in Neon
by Xia, Tian, Ph.D., PRINCETON UNIVERSITY, 2011, 92 pages; 3437789

Abstract:

This thesis summarizes the results of two experimental studies of spin polarized atoms.

In the first experiments, I studied optically pumped metastable Xe atoms that were produced in glass cells with weak electrical discharges in low-pressure Xe gas. The polarization and relaxation rates of metastable 129Xe atoms are measured with magnetic resonance spectroscopy, at both microwave frequencies, where ΔF = 1 transitions are induced between the sublevels, and at radiofrequencies, corresponding to ΔF = 0 transitions. The nuclear spin polarization of the optically pumped velocity group is measured to be 22 ± 2%. The relaxation of metastable xenon atoms is dominated by depolarizing collisions with ground state atoms. We also present a model to simulate the density matrix with optical pumping and the magnetic resonances, and to use the resulting density matrix to simulate the attenuation of the optical pumping light, which provides the primary data for my studies.

The second experiments were aimed at detecting any non-linearities in the pressure shift of the hyperfine frequency of Cs atoms in Ne buffer gas. Such nonlinear shifts can be produced by the formation and breakup of CsNe Van der Waals molecules. Nonlinear shifts have been observed in the heavier buffer gases, Ar, Kr and Xe. My work shows the nonlinear part of the pressure shift from Ne is too small to be detectable with my apparatus, the most sensitive available today.

 
AdviserWilliam Happer
SchoolPRINCETON UNIVERSITY
SourceDAI/B 72-02, Jan 2011
Source TypeDissertation
SubjectsAtomic physics
Publication Number3437789
Adobe PDF Access the complete dissertation:
 

» Find an electronic copy at your library.
  Use the link below to access a full citation record of this graduate work:
  http://gateway.proquest.com/openurl%3furl_ver=Z39.88-2004%26res_dat=xri:pqdiss%26rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation%26rft_dat=xri:pqdiss:3437789
  If your library subscribes to the ProQuest Dissertations & Theses (PQDT) database, you may be entitled to a free electronic version of this graduate work. If not, you will have the option to purchase one, and access a 24 page preview for free (if available).

About ProQuest Dissertations & Theses
With over 2.3 million records, the ProQuest Dissertations & Theses (PQDT) database is the most comprehensive collection of dissertations and theses in the world. It is the database of record for graduate research.

The database includes citations of graduate works ranging from the first U.S. dissertation, accepted in 1861, to those accepted as recently as last semester. Of the 2.3 million graduate works included in the database, ProQuest offers more than 1.9 million in full text formats. Of those, over 860,000 are available in PDF format. More than 60,000 dissertations and theses are added to the database each year.

If you have questions, please feel free to visit the ProQuest Web site - http://www.proquest.com - or call ProQuest Hotline Customer Support at 1-800-521-3042.