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Science 19 June 2009:
Vol. 324. no. 5934, p. 1516
DOI: 10.1126/science.1167919
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Technical Comments

Response to Comments on "Experimental Test of Self-Shielding in Vacuum Ultraviolet Photodissociation of CO"

Subrata Chakraborty,1 Musahid Ahmed,2 Teresa L. Jackson,1 Mark H. Thiemens1,*

We address the comments by Lyons et al., Federman and Young, and Yin et al. regarding the interpretation of our carbon monoxide photodissociation experiments and provide further experimental data analysis, including measured synchrotron beam profiles. The experimental data do not support existing self-shielding models that attempt to explain observed meteoritic oxygen isotopic compositions because they rely on previously untested theoretical assumptions.

1 Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, CA 92093–0356, USA.
2 Chemical Sciences Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720, USA.

* To whom correspondence should be addressed. E-mail: mthiemens{at}ucsd.edu

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