Rotational analysis of the (7,1) band of the A^2(pi)i–X^2(sigma)+ system of CS+ studied by velocity modulation laser spectroscopy

A set of 36 new microwave transitions have been measured for o-benzyne, generated by pyrolysis of phthalic anhydride. All 50 known rotational transitions have been fitted to give an improved set of rotational and centrifugal distortion constants. A short waveguide based microwave spectrometer designed specifically for short lived species is described.