Abstract
A commercial interferometer has been modified for high resolution gas phase work by addition of a variable temperature cell of 3 m path length. The data reduction method is described, and examples of the performance are given. Two rotation-vibration bands of diacetylene, ν9 and ν79, have been analyzed to yield ν9=220.139(5), ν7=482.13(1), and B0 = 0.14649(7) cm-1.

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