Abstract
Absorption measurements have been made for vibration-rotation lines of the [10 00, 02 00] I-00 01 (long wavelength, I) and [10 00, 02 00] II-00 01 (short wavelength, II) transitions of four symmetric, isotopic species of carbon dioxide ( 12C 16O 2, 13C 16O 2, 12C 18O 2, and 13C 18O 2). The derived rotationless dipole moments of I and II have the following values (in 10 -4 D): 376 ± 2 and 325 ± 2 ( 12C 16O 2), 413 ± 3 and 238 ± 3 ( 13C 16O 2), 297 (calculated value) and 397 ± 2 ( 12C 18O 2), 342 ± 6 and 357 ± 6 ( 13C 18O 2), respectively. The calculated matrix elements relating to changes in both wave functions and electrooptical constants resulting from isotope substitution agree with the experimental data within 4%. The results obtained are used to analyse the properties of CO 2 isotopic lasers.
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