Collinear Laser Spectroscopy at ISAC TRIUMF

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Collinear Laser Spectroscopyat ISAC - TRIUMF

• CAP Congress 2005
• Thomas Cocolios

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Outline

• ISAC and the Collinear Laser Beam Line
• Original Collinear Laser Spectroscopy at ISAC
  Polarising Fluorine
• New Collinear Laser Spectroscopy at ISAC Neutron
  Deficient Lanthanides

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Collinear Laser Spectroscopy
Doppler Compression reduces the spread in energy
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Polarising Fluorine
3p 4D7/2
3p 4D5/2
3s 4P5/2
3s 4P5/2

• Polarisation occurs on a cycling transition
• Use of a metastable state
• Metastable state produced at neutralisation cell
• Population study through a non-cycling transition

2p 2P3/2
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Neutralisation and Reionisation
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Fluorescence Spectrum
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Preferential Ionisation Spectrum
F 3
4D5/2
3460 MHz
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Depopulating Transitions
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4P5/2
7944 MHz
2
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Lanthanum
5d6p 3D1

• Study requires an s electron
• Metastable state produced at surface ionisation
  source
• Limited metastable population fraction due to
  high level gt 7000cm-1
• Decay scheme appropriate for fluorescence
  detection

6s2 1S0
5d2 3F2
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Fluorescence Spectrum
F 9/2
3D1
2471 MHz
7/2
1922 MHz
5/2
1S0
7/2
2nA of 139La from a microwave source
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Background Study
1/3 Hz.mW-1
33 Hz
0 Hz
0 Hz
140 Hz
63 Hz
8 Hz
12 Hz
X
4Hz.pA-1 leads to signal-to-noise ratio of 1-5 !
gt 14 HOURS ACCUMULATION
X
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Conclusion

• New Research Scientist to further Collinear Laser
  Spectroscopy at TRIUMF
• Off-line test for Lanthanum metastable population
  study
• Online run in August 2005
• Off-line test for Fluorine in September 2005

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POLARIZER
Post-Acceleration Electrode
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Collinear Laser Setup
Ar pump laser
Dye laser Rh110
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Contra-linear Laser Setup
Ar pump laser
Dye laser R6G