Diode laser spectrum of diacetylene near 5 μm

Abstract

The ν 5 rotation-vibration fundamental band and the ν 5 + ν 9 band of diacetylene in the region 2000–2037 cm −1 have been measured to an accuracy of better than ±0.004 cm −1 using a tunable-diode laser spectrometer. The l-type doubling in the ( ν 5 + ν 9 − ν 9 band has been resolved. Line positions, assignments, band origins, and rotational constants B′ v , B″ v , D′ v , and D″ v are reported.