Knowledge Bank

The infrared spectrum of HTO and $T2O$ has been observed with high resolution ($0.04cm-1$) from 2000 to $6500cm-1$. for both species the $\nu 3$-band is by far the strongest; in the case of HTO, it is a hybrid band with A and B spectra of similar intensities. From the analysis of the spectrum, band centers and rotational constants have been derived. For HTO, the $2\nu 2$, $\nu 1$ and $\nu 3$ bands are well separated from each other and no resonance occurs; in spite of the fact that 2$\nu 2$ is a very weak band in our spectrum, we hope to obtain from HTO better information on x22 than that coming from other species. While the A constant of HTO is almost as it is for $H2O$ and HDO, B and C are much smaller. As a consequence, the rotational asymmetry of HTO is considerably reduced. A few microwave lines of HTO have also been recorded, namely the $313-312$ transition at 16625 MHz. Since selection rules in infrared and in infrared and in MW are complementary, the MW lines enabled us to connect all ground state energy levels.