[Triumf-seminars] TRIUMF ISAC Seminar today at 16:00

[TRIUMF Seminars]

Date/Time: Fri 2020-01-24 at 16:00

Location:  ISAC2 conf. rm      

Speaker:   Maryam Mostamand (TRIUMF / U Manitoba)

Title:     Laser developments  &  study of Rydberg and autoionizing states in Tm, La and At  using resonant ionization laser spectroscopy

Abstract: In this seminar Maryam Mostamand will present the key results from the research that forms the bulk of her U Manitoba dissertation.

"The resonant ionization laser ion source is an element-selective, efficient and versatile ion source which generates radioactive ion beams at on-line mass separator facilities. Elements with complex atomic structures and incomplete spectroscopic data require ionization scheme development. A grating-tuned titanium:sapphire (Ti:Sa) laser was used in applications for spectroscopy studies.

A regiment of automated and continuous frequency-doubled and frequency tripled scans was developed to investigate different energy regions and electronic configurations of the elements. 
An intra-cavity frequency doubled chromium:forsterite laser was built, to cover the spectral gap between the orange and red wavelengths as these are not attainable using Ti:Sa lasers. 
Laser resonance ionization spectroscopy has been performed on lanthanum (La) and thulium (Tm) at TRIUMF’s off-line laser ion source test stand to identify the highest efficiency ionization scheme for delivery of radioactive ion beams and remeasure the ionization potential of Tm and La atom with improved accuracy. 
In-source resonance ionization spectroscopy of the purely radioactive astatine atom was performed at the ISAC/TRIUMF radioactive ion beam facility to search for an efficient ionization scheme throughout auto-ionizing states.

On the newly implemented ion guide laser ion source (IG-LIS) for isobarically pure RIB, operating modes and parameters were being developed and optimized. Design improvements are being implemented into the prototype for more robust and efficient on-line operation, and based on simulation (SIMION 8.0.4) studies further refinements are being implemented on the quadrupole ion guide based IG-LIS and a higher efficiency octupole based IG-LIS is being proposed."


Stimulants available 15 minutes before the talk.
The seminar is part of the Targets & Ion Sources group meeting

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General TRIUMF seminar information available at http://www.triumf.ca/home/upcoming-events/about-seminars-lectures