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Multiphoton Excitation and Ionisation in the 9–12 eV Region of O 2 by a 1.06 μm Glass Laser
Author(s) -
Godart J.
Publication year - 1985
Publication title -
beiträge aus der plasmaphysik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.531
H-Index - 47
eISSN - 1521-3986
pISSN - 0005-8025
DOI - 10.1002/ctpp.19850250608
Subject(s) - atomic physics , excitation , ion , ground state , laser , ionization , absorption (acoustics) , flux (metallurgy) , physics , materials science , neodymium , optics , quantum mechanics , metallurgy
In this letter we report results of a selective multiphoton excitation of O 2 in the 9–12 eV region by a neodymium glass laser. The main feature of this experiment is the major presence of the ion specie O 2 + in the interaction volume with the values 10 ± 1 for the nonlinear interaction order. This result can be interpreted as a double mechanisms namely: a one step process, the direct absorption from the ground state or a two step process via an intermediate resonant state which has been attributed as the second ( B ′ 3 Σ u − , v ′=2) state of O 2 located at 10.56 ± 0.03 eV. The probability of multiphoton formation of O 2 + for a flux value of 1,5 × 10 12 W/cm 2 is equal to 2 × 10 7±1 sec −1 .