A preliminary rotationhyphen;vibration analysis of then=0 andn=1 subbands associated with thenngr;6+ngr;1minus;nngr;6hydrogenhyphen;bonded vibration in HCNsdot;sdot;sdot;HF has been completed. The following excited state rotational constantsBprime; and band origin frequencies ngr;0have been determined for the complex. The results are consistent with a rotationhyphen;vibration interaction constant agr;1=minus;68.3plusmn;1 MHz which correlates with an excited stater(Nsdot;sdot;sdot;F) internuclear distance of 2.762 Aring;, a decrease of 0.034 Aring; relative to the ground state. Excited state lifetimes associated with assigned transitions are demonstrated to be ge;1.8times;10minus;10s while thex16anharmonic constant is evaluated to be 4.01plusmn;0.03 cmminus;1.
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