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Diagram of the eight lowest lying electronic states of separated into singlet and triplet manifolds. Previously observed spectroscopic bands involving these states are indicated. The new band reported in this Communication is the band system. The specific transition reported here is the transition indicated by an asterisk.
Survey LIF spectrum of in an acetylene discharge with detection wavelength set to . Bands due to the Swan system are assigned below the spectrum and the new band system assigned above.
High resolution LIF spectrum of the transition near . Reflected below is a simulation at using the known constants of the state (Ref. 11). Assignments are given for the various rotational branches with the first indicated. Alternate values are missing due to nuclear spin statistics (nuclear spin of ). The state constants were varied using a non-linear least squares routine.
Molecular constants for the state of obtained by least squares fitting of the observed band positions. The symbols and respectively represent the spin-spin interaction and spin-rotation interaction.
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