Knowledge Bank

We have constructed a new hybrid potential energy curve for the X state of KH that includes scaled ab initio calculations at short range, RKR turning points in the potential well and proper long-range behavior. Then for the observed1 quasibound state $(v\prime \prime =23,J\prime \prime =7$, width = $0.40cm-1$), we calculated line widths for varying binding energies. From a comparison with the experimental line width, we determined an improved dissociation energy $Dc=14772.7\pm 0.5cm-1$. This result is $4.3cm-1$ lower and eight times more precise than the best previous result based on $A1\Sigma +-X1\Sigma +$ fluorescence $experiments.1$ A new hybrid potential was also constructed for the X state of CsH. From a comparison of the experimental line width2 for the observed quasibound state $(v\prime \prime =25,J\prime \prime =11.width=0.6cm-1)$, we determined an improved dissociation energy $De=14792.3\pm 1.4cm-1$. This result is $15.7cm-1$ lower and three times more precise than (but outside the range of) the best previous result from $A1\Sigma +-X1\Sigma +$ fluorescence $studies.2$