Abstract
A new tunable far infrared difference frequency spectrometer has been used to observe the Q branch of the lowest Π bending vibration of ArH 79Br and ArH 81Br. The vibrational frequencies are 26.665635(4) and 26.665284(4) cm -1 for the 79Br and 81Br species respectively. The average center-of-mass separation is 0.07 Å shorter in the excited state than in the ground state and analysis of the bromine nuclear hyperfine structure provides the excited state angular expectation value 〈 P 2(cosθ)〉 = -0.098(2). The data indicate significant coupling between the bending and stretching coordinates of the complex at angles sampled by the Π state. The results are compared with the best available theoretical calculations for this species and the agreement is found to be excellent.
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