Abstract
The complete set of microwave data for the nine isotopic species of the GeS molecule, available in literature, is reduced to molecular parameters by a nonlinear least-squares fit. All the hfs lines due to 73Ge ( I = 9 2 ) and 33S ( I = 3 2 ) are included in this fit. Watson's expressions of Dunham coefficients, including corrections to the Born-Oppenheimer approximation, are used. Contributions from off-diagonal terms are taken into account in the hfs Hamiltonian which is numerically diagonalized. A set of 12 hyperfine and isotopically invariant parameters is obtained and compared with previous determinations. It is shown that the accuracy of the hfs parameters is improved by one order of magnitude by the global treatment of all the data.
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