07.01.2015
Doctoral Dissertation

8. Jan. Laser Developments and High Resolution Resonance Ionization Spectroscopy of Actinide Elements (Sonnenschein)

Time:

8.1.2015 12:00 — 15:00


Location: Ylisto , YAA 303
Release: Laser Developments and High Resolution Resonance Ionization Spectroscopy of Actinide Elements
M.Sc. Volker Sonnenschein defends his doctoral dissertation in Physics ”Laser Developments and High Resolution Resonance Ionization Spectroscopy of Actinide Elements” on 8 Jan 2015.

Volker Sonnenschein. Photo Tarja Vänskä-Kauhanen.

[In Finnish]

M.Sc. Volker Sonnenschein defends his doctoral dissertation in Physics ”Laser Developments and High Resolution Resonance Ionization Spectroscopy of Actinide Elements”. Opponent Professor Jon Billowes (University of Manchester, UK) and custos Senior Lecturer Iain Moore (University of Jyväskylä).

Laser developments of pulsed Ti:sapphire laser systems have been carried out at the IGISOL facility in the University of Jyväskylä, Finland. To further the applications of Ti:sapphire technology in the domain of resonance laser ionization, several new laser resonator designs have been implemented.

Studies for the development of ionization schemes have been simplified by use

of a grating-based cavity. For increased spectroscopic resolution a dual-etalon as well as an injection-locked Ti:sapphire laser have been built and characterized. Increased output power of higher harmonics has been achieved with the technique of intra-cavity frequency doubling. Extension to a new frequency domain has been realized using difference frequency mixing, generating light in the visible range from 550-700nm.

 These new developments have been successfully applied in experimental studies at the University of Mainz (Germany), the LISOL facility (Belgium) as well as at IGISOL (Finland). High resolution resonance ionization spectroscopy has been used to study the ground state hyperfine structure of 229Thorium in an ongoing effort to identify a highly sought after nuclear isomer. Further high resolution work has been carried out on 227Actinium as well as several isotopes of plutonium. Systematic studies of the hyperfine structure of natural copper have been employed to determine the accuracy of future in-source and in-jet laser spectroscopy applications at IGISOL.

 

  • Volker Sonnenschein, Laser Developments and High Resolution Resonance Ionization Spectroscopy of Actinide Elements, JYFL Research Report 1/2015
  • ISBN  978-951-39-6049-0   (paper copy)
  • ISBN 978-951-39-6050-6  (pdf)
  • ISSN 0075-465X

More information

Volker Sonnenschein

Doctoral student

None

volker.t.sonnenschein@jyu.fi