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Excited atomic fragments following electron dissociation of pyrimidine

A crossed electron–gas beam system coupled to a VUV spectrometer has been used to investigate the dissociation of pyrimidine into excited atomic fragments in the impact energy range from threshold to 375 eV. Data have been made absolute using Lyman-α from H2 as a secondary standard. The main features in the spectrum are the H Lyman series lines. The emission cross section of Lyman-α is measured to be (2.44 ± 0.25) 10−18 cm2 at 100 eV impact energy. The probability of extracting C or N atoms from the ring is shown to be very small. Possible dissociation channels and excitation mechanisms in the parent molecule are discussed.