Centrifugal distortion in asymmetric top molecules; ordinary formaldehyde, H2C12O

摘要: A semiclassical approach is used to develop a simple expression for the centrifugal distortion correction in asymmetric top molecules. The general shift of any given energy level involves five experimentally determined coefficients and knowledge dependence term value as function asymmetry. useful simplified frequency $\ensuremath{\Delta}J=0$ transitions only two effective rigid rotor parameters four coefficients. method applied microwave spectrum ${\mathrm{H}}_{2}$${\mathrm{C}}^{12}$O; results show excellent internal consistency. resulting rigid-rotor are: $a=282,106$ Mc/sec, $b=38,834$ $c=34,004$ Mc/sec. electric dipole moment be 2.31\ifmmode\pm\else\textpm\fi{}0.04 debye line breadth parameter 97\ifmmode\pm\else\textpm\fi{}10 microns Hg per