Knowledge Bank

Racant improvements in sensitivity have permitted us to extend $previous(1,2)$ infrared studies of ArHF to encompass all of the low-frequency $(\le 75cm-1)$ bending and stretching vibrations of the excited HF(v-l) potential surface. Accurate vibrational term values, and rotational and centrifugal distortion constants are now known for the ground state $(10\circ )$, and the van der Waals stretch $(000)$. the HF stretch $(10\circ 1)$, and combinations of the HF stretch with the van der waals stretch $(10\circ 1)$. the $\Sigma$ bend $(12\circ 0)$, the $\Pi$ bend $(1110)$. and the van der Waals stretch overtone $(10\circ 2)$. listed in order of increasing energy.