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Rydberg State Excitations in Collisions of Be + and Mg + with He

N. Andersen, K. Jensen, Jimmy Melskens, E. Veje

Published Jan 1, 1973• 0 citations
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The collision-induced two-photon forbidden 3s2 1S-3snp 1P transitions (n>11) and collisional enhancement of 3s2 1S-3sns 1S transitions (n>8) of Mg I have been observed and studied as functions of Mg vapour pressure and perturbing gas (Ar) pressure by using two-photon resonant ionisation and thermionic diode techniques. The occurrence of forbidden transitions and collisional enhancement of 3s2 1S-3sns 1S transitions is qualitatively attributed to the formation of a Rydberg Mg2 excimer and a MgxAry Fermi complex. Quantitatively, the above phenomena are interpreted as collisional mixing of high Rydberg states of Mg. The mixing coefficients are estimated by using perturbation theory and the semiclassical (JWKB) approximation. The theoretical estimation is in good agreement with the experimental result.

Journal of Physics B Atomic and Molecular Physics•Oct 14, 1987•14 citations
Rydberg series of msns and msnd configurations of Be (m=2) and Mg (m=3) were investigated between principal quantum numbers 10 ≤ n ≤ 70. The Rydberg states were populated using stepwise excitation or direct two-photon transitions with frequency doubled light (235 nm ≤ λ < 330 nm) from pulsed dye lasers. The excited Rydberg atoms were detected with a space charge limited thermionic diode. An analysis of the Rydberg series both in Be and Mg by means of multi-channel quantum-defect theory (MQDT) results in the determination of mp2 1D2 admixtures in msnd 1D2 states.
The collision-induced two-photon forbidden 3s2 1S-3snp 1P transitions (n>11) and collisional enhancement of 3s2 1S-3sns 1S transitions (n>8) of Mg I have been observed and studied as functions of Mg vapour pressure and perturbing gas (Ar) pressure by using two-photon resonant ionisation and thermionic diode techniques. The occurrence of forbidden transitions and collisional enhancement of 3s2 1S-3sns 1S transitions is qualitatively attributed to the formation of a Rydberg Mg2 excimer and a MgxAry Fermi complex. Quantitatively, the above phenomena are interpreted as collisional mixing of high Rydberg states of Mg. The mixing coefficients are estimated by using perturbation theory and the semiclassical (JWKB) approximation. The theoretical estimation is in good agreement with the experimental result.