Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Compositional Analysis of the High Molecular Weight Ethylene Oxide
  Propylene Oxide Copolymer by MALDI Mass Spectrometry   The composition of narrow distribution poly ethylene oxide-propylene oxide
copolymer (Mw ~ 8700 Da) was studied using matrix assisted laser desorption
ionization (MALDI) mass spectrometry. The ethylene oxide-propylene oxide
copolymer produced oligomers separated by 14 Da. The average resolving power
over the entire spectrum was 28,000. Approximately 448 isotopically resolved
peaks representing about 56 oligomers are identified. Although agreement
between experimental and calculated isotopic distributions was strong, the
compositional assignment was difficult. This is due to the large number of
possible isobaric components. The purpose of this research is to resolve and
study the composition of high mass copolymer such as ethylene oxide-propylene
oxide.

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The categories of this paper are: hep-th
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The categories of this paper are: quant-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: atom-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: econ
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The categories of this paper are: supr-con
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The categories of this paper are: hep-ex
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The categories of this paper are: gr-qc
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The categories of this paper are: nucl-ex
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The categories of this paper are: q-fin
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The categories of this paper are: math-ph
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The categories of this paper are: solv-int
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The categories of this paper are: funct-an
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The categories of this paper are: dg-ga
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The categories of this paper are: q-alg