We have measured the blackbody photoionization rate from the 17d state of sodium as a function of temperature from 90 to 300 K. The experimental rates, which vary by a factor greater than one hundred over this temperature range, are in good agreement with our theoretical values.
We have measured lifetimes of sodium s and d levels in the range 17 & n &28. Lifetime shortening due to blackbody radiation has been effectively eliminated by carrying out the measurements in a thermally isolated container cooled to 30 K. The individual lifetimes have been determined to 5% and agree well with calculations based on the Coulombic approximation.The validity of the calculation has been further tested using non-Coulombic methods. An (n*) scaling law has been obtained from the lifetimes and is accurate to 2.4%.
The optical electric field strengths associated with pulsed laser exposures needed to produce conduction electron densities of 1018/cm3 in several direct-gap alkali halides are calculated using three different models: a simplified avalanche model, the Keldysh formulation of multiphoton ionization, and a combination of the two. Numerical calculations are performed for crystalline NaCl, KCl, KBr, NaF, LiF, and CaFz at wavelengths of 1.064,0.694,0532, and 0.355 pm, for nanosecond and picosecond pulse durations. The results
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