Knowledge Bank

In a similar manner to that employed in our analysis of the corresponding bands of $H2S$, we have analyzed $2\nu 2,\nu 1$, and $\nu 3$ of $H2Se$ in the 5.2 to 3.8 $\mu m$ region. We have identified and fitted approximately 520 transitions in $2\nu 2,930$ transitions in $\nu 1$, and 620 transitions in $\nu 3$. Included ate transitions from the isotopic species containing selenium isotopes 82, 80, 78, 77, and 76. Using Typke’s rotational $Hamiltonian,1$ we analyzed all isotopic species simultaneously. Ground state constants were determined from a simultaneous least squares fit of 879 distinct ground state combination differences from our data and 109 microwave $transitions.2$ Upper state constants were obtained from least squares fits of our spectral lines analyzing $2\nu 2$ as a single non-interacting band and analyzing the Coriolis interacting bands $\nu 1$ and $\nu 3$ simultaneously, keeping the ground state constants fixed.