UBC Theses and Dissertations
The lifetime and the magnetic hyperfine structure constant measurement of 3D(3d¹∑), 3E(3d¹π) state of molecular hydrogen Chien, Cary Way-Theng
The lifetime and the magnetic hyperfine structure constant measurement of 3D(3d¹∑), 3E(3d¹π) state of molecular hydrogen This thesis describes the lifetime, the Landé g-factor and the hyperfine structure constant results from three major indpendent techniques: The Hanle effect, the magnetic resonance, and the repolarization experiments. The Hanle effect (Zero-field level crossing) has been used to measure the lifetimes of the 3D(3d¹∑), 3E(3d¹π) and Z (3¹k double excited) states of molecular hydrogen, the 3¹D, 4¹D, and 5¹D states of helium, and the 2p (Paschen notation) states of argon and neon. The upper states were excited by electron excitation in a 450 MHz radio-frequency electric field. Where free of any cascading effect or Stark effect, the lifetime measured were accurate to within 5%. The pressure broadening cross-sections for the above states have been also reported in this thesis. By the repolarization experiment some of the hfs constants of 3D and 3E states of hydrogen have also been measured to within 10%. In the calculation of lifetimes, some of required Landé g-factors were measured by the magnetic resonance experiment and some by the Zeeman effect in a 27,000 gauss magnetic field in this lab.
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