Testing the morphed potential of Ar:HBr using frequency and phase stabilized FASSST with a supersonic jet

The lowest frequency Σ bending vibration of Ar:HBr has been recorded using frequency and phase stabilized Fast Scan Submillimeter Spectroscopic Technique (FASSST) coaxially with a supersonic jet. The fitted band origin was ν0=329611.4482(16) MHz, the excited stated rotational constant was B=1236.41359(22) MHz, the distortion constants were DJ=0.0124740(36) MHz and HJ=−2.503(17)×10−6 MHz and the quadrupole constants were χaa=260.9552(79) MHz and Dχ=−0.03174(35) MHz for Ar:H79Br. Corresponding values have also been determined for the Ar:H81Br isotopomer. χaa and Dχ are compared with values predicted from a recently determined morphed potential of Ar:HBr.