Diode laser spectroscopy of the ngr;3and ngr;2bands of FHFminus;in 1300 cmminus;1region

摘要

The ngr;3, ngr;2, and ngr;1+ngr;3minus;ngr;1bands of a linear molecular anion FHFminus;have been detected by diode laser spectroscopy in 1300 cmminus;1region. The previously reported 1848 cmminus;1band lsqb;K.thinsp;Kawaguchi and E. Hirota, J. Chem. Phys.84, 2953 (1986)rsqb; was reassigned to the ngr;1+ngr;3combination band. Analysis of the observed spectra gave the fundamental frequencies ngr;1=583.0539(13), ngr;2=1286.0284(22), and ngr;3=1331.1502(7) cmminus;1with three standard deviations in parentheses. From the rotational constants obtained, the equilibrium Fndash;F internuclear distance was calculated to be 2.277thinsp;71(7) Aring;.