Abstract
The jet-cooled rotational spectrum of the A 1A′←X 1A′ 0 0 0 vibronic band of 1-fluoronaphthalene at 313.8 nm is recorded by scanning the frequency-doubled output of a cw ring dye laser. Stark shifts and splittings of selected rotational lines are measured by applying homogenous electric fields of the order of a few kV/cm. A change from the expected quadratic Stark effect to a linear behaviour is observed. Diagonalization of both rotational and Stark Hamiltonians is carried out with varying dipole moment components. The best fit is achieved for μ a =0.622(6) D, μ b =1.261(10) D, ¦μ¦=1.406(10) D in the X state and μ a =0.519(5) D, μ b =1.283(14) D, ¦μ¦=1.384(14) D in the A state.
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