The ir and Raman spectra of pyrazinium chloride and bromide and their ND deuterated derivatives have been obtained in the 4000–300 cm<sup>−1</sup> range. Twenty-six fundamentals of the pyrazinium ion are identified and compared to those of the pyrazine molecule. Frequency shifts on protonation of pyrazine are discussed.
R. Foglizzo and A. Novak, "Infrared and Raman Spectra of Pyrazinium Halides," Appl. Spectrosc. 24, 601-605 (1970)