Knowledge Bank

The rotationally resolved spectrum of the (000-000) $B¯2A--X¯A\prime$ band system of supersonic molecular beam sample of CaSH has been recorded in the presence of variable static electric field. The magnitude of the $\alpha$-principal axes components of the permanent electric dipole moment, $|\mu a|$, was determined to be 5.36(4) Debye and 3.78 (7) Debye for the $X¯2A\prime$, and $B¯2A-$ states, respectively. An analysis of the field free spectrum produced values for the (000) $B¯1A\prime \prime$ vibronic state fine structure parameters of ($incm-1)$; $A=10.43356(160)B=014343(15),C=0.14114(15),\epsilon aa=-5.7793(19),\epsilon bb=0.10767,\epsilon cc=0.03270(83)$. A comparison with the spectroscopic parameters derived from the analysis of the $A¯2A--X¯A\prime$ band $system1$ and a simple one electron molecular orbital picture will be presented.