HIGH-RESOLUTION PHOTOACOUSTIC OVERTONE SPECTRUM OF MONOBROMOACETYLENE, HCCBR, ABOVE 11,600 CM(-1)

Photoacoustic overtone spectra of monobromoacetylene, HCCBr, have been recorded in the wavenumber region 11600-13400 cm(-1) using a titanium :sapphire ring laser spectrometer. All together, eight overtone bands of (HCCBr)-Br-79 and eight bands of (HCCBr)-Br-81 have been observed i n the rotational analysis. A Fermi resonance model based on convention al normal coordinate theory has been used to vibrationally assign the rotationally analyzed bands. The resonance model employed reproduces w ell the observed vibrational band origins and rotational constants. (C ) 1998 Academic Press.