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fiF°Y»fÉÎ·é¶ÝäjªYf¿RhCgÌsn«L@¨Éä×ÄC½­ÜÜêé±ÆàmF³êCSTXM_XANES ÌÊÆ²aIé24)BÅWild2 a¯oÌL@¨ÉÖµÄÍCSTXM_XANES ªÍÅÍÈ¢ªCÌæL@¨ÌM~m_ÅotðÁªðµCAéOVªo³ê½Æñ³êÄ¢é26) BêûCYf¿RhCgÌL@¨ÌMFig. 3

C_XANES spectra of organic materials from Comet Wild2particles. The spectra from insoluble organic materials fromcarbonaceous chondrites are also shown for comparison.
The scale on the vertical axis is arbitrary. The peaks can beattributed to a: aromatic carbon, b: nitrile, c: aliphatic car­bon, d: carbonyl carbon in amide moieties, e: carbonyl car­bon in carboxyl or ester moieties, f: alcohol or ether moieties(Fig. 1 in 23); Original data from 25)).

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Bulk N/C and O/C ratios of organic materials from Comet
Wild2 recovered by Stardust, estimated from C_, O_, and N_XANES analyses (open squares). The N/C and O/C ratiosof insoluble organic materials from carbonaceous chondrites(solid squares) and an IDP L20211R11 (solid circle) arealso shown for comparison (Fig. 3 in 23); Original datafrom 25)).

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Future sample­return missions from primitive
small bodies and in­situ synchrotron analysesof returned samples
Shogo TACHIBANA
Abstract

Department of Natural History Sciences, Hokkaido University
N10 W8, Sapporo 060_0810, Japan

Abstract Sample­return missions from primitive solar­system small bodies are now being planned
for the next couple of decades, and we will obtain returned samples from various small bodies
with geologic information but without serious terrestrial contamination. The state­of­the­art ana­
lytical techniques can be applied to precious returned samples to understand the evolution of thesolar system and the pre­biotic diversication of organic materials prior to the accretion of theEarth. In­situ synchrotron analyses are powerful non­destructive methods to extract the maxi­
mum information from the precious samples, of which usefulness is discussed in the article.

úËõ Nov. 2012 Vol.25 No.6  327