($DL_{3}$ LAST MINUTE ADDITION TO THE PROGRAM) Q BRANCHES OF THE $\nu_{2}$ BAND OF $^{13}C^{16}O^{17}O,\ ^{13}C^{17}O_{2}, \ ^{13}C4^{17}O^{18}O$ AND $^{13}C^{18}O_{2}$
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Date
1980
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Ohio State University
Abstract
A diode laser has been employed to examine the Q branch absorption lines of the $\nu_{2}$ band for the following $CO_{2}$ isotopes: $^{13}C^{16}O^{17}O,\ ^{13}C^{17}O_{2}, \ ^{13}C4^{17}O^{18}O$ AND $^{13}C^{18}O_{2}$, and $^{13}C^{18}O_{2}$. An analysis of the relative frequency spacing between the absorption lines yielded the following values for $\Delta B$ expressed in units of $10^{-3}$ $cm^{-1}$: 1.016(2) for $^{13}C^{16}O^{17}O, 0.964(1)$ for $^{13}C^{17}O^{2}$, 0.9163(3) for $^{13}C^{17}O^{18} O$ and 0.891(2) for $^{13}C^{17}O_{2}$. Values for $\nu_{o}$, the band origin, were also obtained by super-imposing on the spectra known absorption lines of $^{12}C^{16}O_{2}$ and $^{12}C^{16}O^{18}O$. The following values were obtained for $\nu_{o}: 645.7440(2)$ for $^{13}C^{16}O^{17}O, 643.0064(1)$ for $^{13}C^{17}O_{2}, 640.5680(1)$ for $^{13}C^{17}O^{18}O$ and 638.1149(5) for $^{13}C^{18}O_{2}$. The above listed errors for $\nu_{o}$ are associated only with the statistical fitting of the data; the absolute accuracy depends upon the $^{12}C^{16}O_{2}$ reference lines which are known to about $\pm 0.001$ $cm^{-1}$. A comparison of the diode laser results are made with previous measurements utilizing Fourier transform spectroscopy.
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