The electronic structure of cytosine, 5‐azacytosine, and 6‐azacytosine

The normal and vacuum uv spectra of cytosine, 5‐azacytosine, and 6‐azacytosine thin layers were determined. The spectra were resolved into a series of Gaussian bands and the experimental band positions and oscillator strengths were compared with the calculated values. The calculations were carried out with the PPP‐SCF‐CI method. The agreement of the calculations with those of others and with the experiment is discussed.

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