Knowledge Bank

The laser stark spectrum of $CH318OH$ was investigated using the HCN laser lines. The spectra were taken for both parallel and perpendicular polarizations at stark electric fields up to 60.000 V/cm. Several transitions involving high J and K values, have been studied at the 311 um and 337 um lines of the HCN laser. Some of the transitions observed at 311 um have been identified as $Jk=102\leftarrow 91,A1+,v1=0$, $Jk=210\leftarrow 200$, $E.v1=0$, $Jk=206\leftarrow 205,A,v1=1$, and $Jk=154\leftarrow 163$, $E2,v1=1$. A few transitions observed at 337 um have been assigned as $Jk=96\leftarrow 105,E2,v1=0$ and $Jk=11\leftarrow 22$, $E2$, in the $v1=1$ torsional state. Using the stark shifts of the transition $Jk=96\leftarrow 105$, $E2,v1=0$ and the frequency of this transition, as obtained from the combination relations of observed absorption peaks in a recently recorded Fourier transform far infrafed spectrum, the parallel component of the electric dipole moment of $CH318OH$ is obtained as 0.898 D. Zero field frequencies for all the assigned transitions are given with improved accuracy over those calculated from molecular constants.""