The 4s³P₁ state of argon decays radiatively by a resonance
transition to the 3p⁶¹S₀ ground state; the wavelength of this radiation
is 1067A. By direct observation of the decay of the 1067A radiation
from excited argon gas, a value of 0.93±0.06 x 10⁻⁵ seconds
has been obtained for the natural...