The reported chemical fractionation of a single isotope O-16 under simulated space conditions provides the first experimental proof for the hypothesis that the oxygen isotopic anomaly (and other similar anomalies) seen in meteorites is a product of chemical fractionation in interstellar or circumstellar space. Work proposed on this subject was discontinued because a peer review determined that such effects could not possibly exist and that continued support of this project would be a wasted effort. A bibliography is included of articles generated during research in this area

Arrhenius, G.

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Produced by the NASA Center for Aerospace Information (CASI) 
https://ntrs.nasa.gov/search.jsp?R=19830010505 2020-03-21T05:36:23+00:00Z
IIKRELEV . DAVIS • IRVINE • LOS ANGELES • RIVERSIDE • SAN 0IE00 • SAN "ANCISCO	 SANTA BARBARA • SANTA CRUZ
POST OFFICE BOX 109
LA JOLLA, CALIFORNIA 92037
February 9, 1983
As a final report or Grant #NASA NGL-05-009-002, Condensation of solids
in space - isotope fractionation in the model syster. C-0, i should like to
attach the fallowing documents:
1.0
I	 .-1 aoM	 U co
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as	 b 0
951fr= FOR PURE AND
APKIED PH *SCAL SCIENCES
OFNICK OF THE ASSOCIATE DIRECTOR
1) Modified version of the research section of our last proposal
submitted for this work, and reporting the experimental break-
through on theproblem at hand; chemical fractionation of the
single isotope 260 under simulated space conditions. These
results provide the first experimental proof of the main theme
pursued over the last few years. What we have proposed is that
the oxygen isotopic anomaly (and other similar anomalies), seen
in meteorites, is unlikely to be of nucleosynthetic origin as
is commonly _hought, but is a product :f chemical fractionation
in interstellar or circumstellar space.
2) A recent published article discussing this problem further.
3) A manuscript in preparation citlining the quantitative radio-
physical details.
As you know, we had to discontinue this work because of the expressed
_feelings in the oeer review that such effects could not possibly exist, and
that zvntinued support of this project would thus be a wasted effort.
It is little consolation that subsequent developments have fully proven
the correctness of our proposal, including the importance of isotopic fil-
tering effects in the earth's atn:^,phere outlined in our proposal of 1981,
and published by Cicerone and McCrumb, the latter as a member of our research
group. Furthermore, the filtering effect on single oxygen isotope fractiona-
tion was discovered in the actual space medium by Bally and Langer last year;
and the effect of resonance excitation by H Lyman a radiation has been cor-
robo*aced by astronomical observation (Gahm et al; see references in attached
articles).
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Finally, and most strikin gly, the cork initiated under the present grant
has after its demise fortunately beer taken up by Prof. M. Thiemens of this
campus, who by means of elegant experiments recently has been able to simulate
the chemical fractionation effect of pure 160 at a level, fully corresponding
to the ef fect seen in meteorites, and leaving no doubt about the exclusive
i=vartance of this effect. I am attaching a newspaper article from the Los
Angeles Tires announcing this success (scientific articles are at the present
time in ^ress in the journal of Chemical Phvsics+-a_-4-9cience).
*---	 0
-2-
Although much remains to be done to further clarify the physical and
chemical processes involved and their counterparts in the space medium, the
matter is now in principle established, and the major goal of our five-year
research in this field fulfilled. We would naturally have been happy to see
the most recent step in this effort have been taken as a result of NASA
support in our group; however, we are for the sake of scien%e and the vindi-
cation of our concept of course happy to see it coming to fruition also in
this way.
I find it symptomatic that foresighted understanding and support of our
effort was during the lifetime of this project provided by NASA's scientif,c
research monitor in this field in spite of the lack of understanding, and in
some cases outright rejection from academic referees. We wish to take this
opportunity to convey our thanks particularly to Dr. W. Quaide for his most
profound insight and help, and to NASA for continuing support over many
years.
Sincerely,
Gustaf Arrhenius
Associate Director
Professor of Oceanography
GA/mbh
t
List of References
Grant No.: NGL05-009-002
Principal Investigator: Gustaf Arrhenius
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Page 2
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Page 3
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Condensation of solids in space. Isotope fractionation in the model system C-O

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