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Ionization of sodium vapour by nanosecond resonant laser pulses tuned to 3S → 4P transition

We present a model of dense sodium vapour ionization induced by nanosecond resonant laser pulses exciting the 3S → 4P transition. The results of calculations are compared with those obtained by means of a similar model for the case of 3S → 3P excitation. The possibility of population inversion formation between excited sodium levels is also discussed.