The optical characteristics of sustained weak luminescence of liquid nitrogen were studied after exposure to a pulse of UV radiation. The luminescence consisted of a bulk emission of the liquid and localized luminous regions. The luminescence spectrum of liquid nitrogen in UV-VIS range was studied. The UV radiation parameters that influence the excitation of the luminescence of liquid nitrogen were investigated. A possible scheme of bulk luminescence of liquid nitrogen and a hypothesis of the formation of localized luminous regions were discussed.

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