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DETERMINATION OF ABSOLUTE FREQUENCIES OF $^{12}C^{16}O$, $^{12}C^{18}O$, $^{13}C^{16}O$ AND $^{13}C^{18}O$ LASER LINES
Richard S. Eng, H. Kidal, David L. Spears, James C. Mikkelsen, Arthur H. M. Ross
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Abstract
Improved molecular constants for $^{12}C^{16}O$, $^{12}C^{18}O$, $^{13}C^{16}O$, and $^{13}C^{18}O$ have been determined by using a heterodyne technique to measure beat frequencies up to 46 GHz between $^{12}C^{16}O$ and frequency-doubled $CO_{2}$ lasers and between $^{12}C^{16}O$ and rare-isotope CO lasers.