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Science 19 June 2009:
Vol. 324. no. 5934, p. 1516
DOI: 10.1126/science.1169923
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Technical Comments

Comment on "Experimental Test of Self-Shielding in Vacuum Ultraviolet Photodissociation of CO"

S. R. Federman1,* and E. D. Young2

Chakraborty et al. (Reports, 5 September 2008, p. 1328) suggested that experimental results provide support for CO photodissociation having caused the oxygen isotope ratio associated with the early solar nebula. We point out that further analysis is required before other mechanisms, such as self-shielding, are shown to be of little importance.

1 Department of Physics and Astronomy, University of Toledo, Toledo, OH 43606, USA.
2 Department of Earth and Space Sciences, Institute of Geophysics and Planetary Physics, University of California, Los Angeles, CA 90095, USA.

* To whom correspondence should be addressed. E-mail: steven.federman{at}utoledo.edu

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Science. ISSN 0036-8075 (print), 1095-9203 (online)