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The vacuum-ultraviolet fluorescence of Kr and Xe and its dependence on gas pressure (10 to 500 Torr) was studied under monochromatic excitation in the vicinity of the first (3P1) and second (1P1) resonance states. For excitation synchrotron radiation was used. Excitation in the long-wavelength wing of the 3P1 states directly results in excited molecules (e.g. 2Kr+h(cross) omega to Kr2*). The radiative decay of these molecules results in the first (Kr: 1250 AA, Xe: 1500 AA) and second (Kr: 1470 AA, Xe: 1700 AA) continua. Under resonant 3P1 excitation, molecule formation via three-body collisions (e.g. Kr*+2Kr to Kr2*+Kr) is established. Excitation of 1P1 states results in 1P1 emission and the continua. The 1P1 emission contains molecular components. In Xe, it is strongly quenched by collisional interaction between the 1P1 state and a near-lying atomic p state.

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