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Unlike some other reproductions of classic texts (1) We have not
used OCR(Optical Character Recognition), as this leads to bad
quality books with introduced typos. (2) In books where there are
images such as portraits, maps, sketches etc We have endeavoured to
keep the quality of these images, so they represent accurately the
original artefact. Although occasionally there may be certain
imperfections with these old texts, we feel they deserve to be made
available for future generations to enjoy.
This thesis explores two distinct applications of laser
spectroscopy: the study of nuclear ground state properties, and
element selective radioactive ion beam production. It also presents
the methods and results of an investigation into isotope shifts in
the mercury isotopic chain. These Resonance Ionization Laser Ion
Source (RILIS) developments are detailed, together with an RILIS
ionization scheme that allowed laser ionized ion beams of chromium,
germanium, radium and tellurium to be generated at the Isotope Mass
Separator On-Line (ISOLDE) facility. A combination of laser
spectroscopy with decay spectroscopy and mass spectrometry
unambiguously demonstrated a cessation of the extreme shape
staggering first observed in the 1970s and revealed the
characteristic kink at the crossing of the N=126 shell closure. A
series of RILIS developments were required to facilitate this
experiment, including mercury "ionization scheme" development and
the coupling of the RILIS with an arc discharge ion source. Laser
spectroscopy has since become a powerful tool for nuclear physics
and the Resonance Ionization Laser Ion Source (RILIS), of the
ISOLDE facility at CERN, is a prime example. Highlighting important
advances in this field, the thesis offers a unique and revealing
resource.
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