Abstract
A new phenomenon, light-induced viscous flow in a one-component gas, is observed in ${\mathrm{CH}}_{3}$F upon velocity-selective vibrational excitation. The effect originates from a state-dependent kinetic collision rate in combination with nonuniform illumination. The theory for this effect is derived using a Chapman-Enskog approach. Good agreement between theory and experiments in the near-hydrodynamic regime is found.
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