Two-photon resonant multiphoton ionisation spectrum of Na<sub>2</sub>
C Y R Wu; F Roussel; B Carre; P Breger; G Spiess; C Y R Wu; Dept. of Phys., Univ. of Southern California, Los Angeles, CA, USA; F Roussel; Dept. of Phys., Univ. of Southern California, Los Angeles, CA, USA; B Carre; Dept. of Phys., Univ. of Southern California, Los Angeles, CA, USA; P Breger; Dept. of Phys., Univ. of Southern California, Los Angeles, CA, USA; G Spiess; Dept. of Phys., Univ. of Southern California, Los Angeles, CA, USA
Журнал:
Journal of Physics B: Atomic and Molecular Physics
Дата:
1985-01-28
Аннотация:
The production of Na<sub>2</sub><sup>+</sup> by laser excitation in the 580-620 nm region mainly results from two-photon absorption of the Na<sub>2</sub> molecules to highly excited gerade state(s) and are subsequently ionised by a third photon. This mechanism, i.e. a two-photon resonance three-photon ionisation process, may account for several recent experimental observations in laser-irradiated sodium vapours. The assignment of the multiphoton ionisation spectrum and the dependence of the yield of Na<sub>2</sub><sup>+</sup> on the Na<sub>2</sub> vapour density and the laser power density are presented.
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