IR SPECTROSCOPY OF LONG CARBON CHAINS AND THEIR DERIVATIVES IN CRYOGENIC MATRICES: SPECIES IDENTIFICATION BY $^{13}$C$_3$$\rightarrow$$^{12}$C$_3$ ISOTOPIC SUBSTITUTION
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Date
2007
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Publisher
Ohio State University
Abstract
\maketitle Along with matrix gas, we co-deposited carbon vaporfrom two separated carbon evaporation sources, namely a $^{12}$C-source and a $^{13}$C-source. Under the applied conditions the C$_3$ molecules are the most abundant species in both carbon sources. We observed that in the formation process of long carbon chains the C$_3$ units play a major role. This finding was used to establish a new species identification method based on isotopic replacement. The old technique of atomic $^{13}$C$\rightarrow$$^{12}$C substitution can be reasonably applied only for molecules with a small number of carbon atoms (n$\lesssim$9). Using the new method of molecular $^{13}$C$_3$$\rightarrow$$^{12}$C$_3$ substitution, quite simple distributions having small number of isotopomeric IR absorptions were obtained also for larger species. We present data for C$_n$ and C$_n$O$_{1,2}$ (n$\gtrsim$6).
Description
Author Institution: Max-Planck-Institut fur Kernphysik, D-69029 Heidelberg, PO Box 103980, Germany