Nascent rotational distribution and the relaxation of the N+2 ion produced by double resonant multiphoton ionization

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Abstract
Laser induced fluorescence (LIF) detection has been applied to measure the rotational distribution of the N+2 ion produced by double resonant multiphoton ionization of the N2 molecule. By analysis of the LIF spectra of the generated N+2 ion, the rotational propensity rules of the photoionization of N2 have been determined, which agree with theoretical prediction. The observed rotational intensity distribution shows relatively good agreement with the calculated result. Rotational relaxation of the N+2 ions by N2 collision has also been measured. The rotational relaxation rate constant is almost equal to that of the vibrational relaxation and the selection rule ‘‘symmetric’’ (+)↔‘‘symmetric’’(+) has been found to be obeyed.