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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: James C. Wyant
  • Vol. 47, Iss. 18 — Jun. 20, 2008
  • pp: 3289–3298

Isotope selective near-resonant two-photon ionization of Ca 41 isotope via the 4 s 11 s S 0 1 intermediate state

M. Sankari  »View Author Affiliations


Applied Optics, Vol. 47, Issue 18, pp. 3289-3298 (2008)
http://dx.doi.org/10.1364/AO.47.003289


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Abstract

Isotope selective excitation of a Ca 41 isotope using a near-resonant two-photon ionization scheme 4 s 2 S 0 1 422.7924 nm , 413.3685 nm 4 s 11 s S 0 1 514.5 nm Ca + has been proposed for using the Ca 41 isotope in applications as a tracer in biomedical studies. The ionization efficiency and optical selectivity have been calculated for various powers of the excitation and ionization laser. Under the optimized excitation and ionization laser powers the ionization efficiency for the studied scheme is found to be 1.7 × 10 4 . The optical selectivity value is 1.0 × 10 5 and both of these values are either comparable or slightly better than the earlier published work by our group. The overall ionization efficiency for the two-photon ionization scheme considering the throughput factor is 5 × 10 3 , which is 2 orders of magnitude higher than the stepwise excitation process. Therefore, the higher ionization efficiency of the process enables monitoring of the tracer isotope for longer durations. In combination with a mass spectrometer, an abundance sensitivity of 10 10 can be obtained, which is adequate for biomedical applications.

© 2008 Optical Society of America

OCIS Codes
(020.3260) Atomic and molecular physics : Isotope shifts
(020.3690) Atomic and molecular physics : Line shapes and shifts
(300.6210) Spectroscopy : Spectroscopy, atomic

ToC Category:
Atomic and Molecular Physics

History
Original Manuscript: August 9, 2007
Revised Manuscript: March 13, 2008
Manuscript Accepted: March 24, 2008
Published: June 12, 2008

Virtual Issues
Vol. 3, Iss. 7 Virtual Journal for Biomedical Optics

Citation
M. Sankari, "Isotope selective near-resonant two-photon ionization of 41Ca isotope via the 4s11s 1S0 intermediate state," Appl. Opt. 47, 3289-3298 (2008)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-47-18-3289


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