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Progress Toward Precision Measurements Using Polyatomic Molecules


Zeng, Yi (2024) Progress Toward Precision Measurements Using Polyatomic Molecules. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/39gs-s382.


Symmetry is a useful tool for solving problems and is a guide helping us to formulate new theories to better understand the universe. The violation of expected symmetries indicates a lack of full understanding and may point towards promising directions of inquiries. The combined Charge Parity (CP) symmetry is one such expected symmetry, and it's violated by a very minute amount in both theory and observations. Within the Standard Model, we don't know why it's here and we don't know its exact amount, though it is not enough to explain the observed asymmetry between matter and antimatter. Hence, studying CP-violating (CPV) physics is a great way to not only complete the Standard Model but also to find out new physics beyond it. We aim to measure CPV phenomena in polyatomic molecules. Specifically, we are going to measure the electron electric dipole moment and the nuclear magnetic quadrupole moment at a precision higher than ever before. Here I report the progress and developments we made towards achieving both.

Item Type:Thesis (Dissertation (Ph.D.))
Subject Keywords:polyatomic molecules; precision measurement; electric dipole moment; nuclear magnetic quadrupole moment; symmetry violation; YbOH; SrOH; cryogenic byuffer gas beams; spectroscopy; linear triatomic molecules; coherent quantum control
Degree Grantor:California Institute of Technology
Division:Physics, Mathematics and Astronomy
Major Option:Physics
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Hutzler, Nicholas R.
Thesis Committee:
  • Filippone, Bradley W. (chair)
  • Cheung, Clifford W.
  • Endres, Manuel A.
  • Hutzler, Nicholas R.
Defense Date:15 April 2024
Record Number:CaltechTHESIS:05242024-210220298
Persistent URL:
Related URLs:
URLURL TypeDescription from the article is used in chapter 3.3 is adapted into chapter 4 is adapted into chapter 5
Zeng, Yi0000-0003-0549-6060
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:16425
Deposited By: Yi Zeng
Deposited On:28 May 2024 19:53
Last Modified:04 Jun 2024 18:49

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