Knowledge Bank

The infrared spectrum of solid HD has been obtained using a Fourier Transform Spectrometer with a resolution of $0.04cm-1$. The $\Delta J=5$ transitions in the pure rotational and vibration-rotation regions have been observed. The measured wavenumbers are $1318.26cm-1$ for the $V0(0)$ and $4486.66cm-1$ for the $V1\leftarrow 0(0)$ transitions. An attempt to interpret this transition by 32-polar induced dipole moment yields a theoretical value of the integrated absorption coefficient $\alpha$ as $1.4\times 10-16$ $cm3s-1$. This compares well with the measured integrated absorption coefficient $1.1\times 10-16$ $cm3s-1$ for $V0(0)$. The $U0(0)$ and $V1\leftarrow 0(0)$ transitions have also been observed and their integrated absorption coefficients have been measured. The $\Delta J=3$ transitions are found to be overlapped by the double transitions of HD. However, the $T1\leftarrow 0(0),Q1\leftarrow 0(0)+T0(0)$ transitions have been identified.