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Laser-induced isotopic effects in titanium resonance ionization

Wunderlich, R. K. and Wasserburg, G. J. and Hutcheon, I. D. and Blake, Geoffrey A. (1993) Laser-induced isotopic effects in titanium resonance ionization. Analytical Chemistry, 65 (10). pp. 1411-1418. ISSN 0003-2700.

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Titanium isotope ratios have been measured by resonance ionization mass spectrometry (RIMS) with special emphasis on the nature of laser-induced isotopic selectivity. A pronounced wavelength dependence of even mass isotope ratios is caused by large nuclear volume effects near the magic neutron number 28 in ^(50)Ti . Optical isotope shifts, ranging from 0.07 to 0.21 cm^(-l), between ^(50)Ti and ^(46)Ti were measured for several transitions. The ^(50)Ti/^(46)Ti and ^(48)Ti/^(46)Ti ratios, nevertheless, exhibited only mass-dependent fractionation, in which the lighter Ti isotopes were enriched by ~2.5%/amu, when the laser operating parameters were properly controlled. Odd-even mass isotopic selectivity in the resonant ionization process was also examined for several transitions as a function of the laser polarization state and intensity. Under saturating conditions for a ΔJ= +1 transition and a high degree of laser depolarization for a ΔJ = 0 transition, the odd-even isotopic enhancement was reduced below the 2% level. The Ti isotope data agree with our previous results for Os and indicate that, by a careful choice of resonance transitions and laser operating parameters, isotope ratios can be measured accurately and reliably with RIMS.

Item Type:Article
Related URLs:
URLURL TypeDescription
Wasserburg, G. J.0000-0002-7957-8029
Blake, Geoffrey A.0000-0003-0787-1610
Additional Information:© 1993 American Chemical Society. Received for review July 6, 1992; accepted February 4, 1993. We thank D. A. Papanastassiou and P. G. Green for assistance in these experiments and M. E. Johnson for manuscript preparation. This work was supported by DOE Grant DE FG03-88ER-13851 (to G.J.W.) and NASA Grant NAGW-1944 (to G.A.B.). The laser system was obtained through support from the David and Lucille Packard and Alfred P. Sloan Foundations (G.A.B.). Division Contribution 5078(749).
Funding AgencyGrant Number
Department of Energy (DOE)DE FG03-88ER-13851
David and Lucile Packard FoundationUNSPECIFIED
Alfred P. Sloan FoundationUNSPECIFIED
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Other Numbering System NameOther Numbering System ID
Caltech Division of Geological and Planetary Sciences5078
Lunatic Asylum Lab749
Issue or Number:10
Record Number:CaltechAUTHORS:20120919-094950384
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Official Citation:Laser-induced isotopic effects in titanium resonance ionization R. K. Wunderlich, G. J. Wasserburg, I. D. Hutcheon, and Geoffrey A. Blake Analytical Chemistry 1993 65 (10), 1411-1418
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:34201
Deposited By: Jason Perez
Deposited On:19 Sep 2012 18:30
Last Modified:09 Mar 2020 13:19

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