Local‐mode effects on the rotational structure of the first stretching overtone band system of stibine, SbH3

摘要: A high‐resolution Fourier‐transform infrared spectrum, resolution about 0.006 cm−1, of the first stretching overtone band system stibine has been measured and rotationally analyzed in detail up to J’=22 for both 121SbH3 123SbH3 isotopic species. The rotational levels A1 E vibrational states have simultaneously by including vibration–rotation coupling terms Hamiltonian two A1/E energy‐level separation found be 0.0727(8) cm−1 0.0763(8) with state being higher energy cases. Fits 1445 transitions standard deviation 0.0024 1322 0.0022 obtained optimizing altogether 33 upper‐state parameters simple local‐mode model is shown account very well dependence constants coefficients vibrationally...