By C. Berger
Lecture Notes in Physics, 191Proceedings of the 5th overseas Workshop on Photon Photon Collisions held on the Rheinisch-Westfalische Technische Hochschule Aachen, April 13-16,1983The 5th foreign Workshop on Photon Photon Collisions used to be held at Aachen from thirteen to sixteen April 1983. carrying on with a practice begun in basic terms years in the past on the Paris convention we had, along with the plenary talks, experimental and theoretical parallel periods. those dialogue periods proved to be a outstanding success.'Two Photon Physics' performs an vital position in checking out quantum chromodynamics, our candidate concept of robust interactions. a large number of new facts has been offered on the workshop and plenty of bothersome theoretical difficulties are actually extra completely understood. i am hoping that this non-stop experimental and theoretical attempt results in a deeper realizing of the underlying powerful interplay dynamics.The Aachen convention was once financially supported by way of the German Federal govt and via the kingdom of Nordrhein Westfalen. The administrational, technical, and monetary aid through the Technische Hochschule Aachen and particularly the 1. Physikali sches Institut is gratefully said. i've got additionally to thank the participants of the overseas Advisory Committee for his or her paintings in getting ready the convention. final yet no longer least, i need to precise my gratitude to the audio system for his or her very good talks.
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Extra resources for Photon-Photon Collisions
22. Correlation between states of two identical atoms in the same electron states and the molecule consisting of these atoms in the case “a” of Hund coupling . The number of molecule states of a given symmetry is indicated in parentheses if it is not 1 Atomic states Dimer states 1S 1Σ + g 1Σ +, 3Σ + g u 1Σ +, 3Σ +, 5Σ + g u g 1Σ +, 3Σ +, 5Σ +, 7Σ + g u g u 1 Σ + (2), 1 Σ − , 1 Π , 1 Π , 1 Δ g u g g u 1 Σ + (2), 1 Σ − , 1 Π , 1 Π , 1 Δ , 3 Σ + (2), 3 Σ − , 3 Π , 3 Π , 3 Δ g u g g u u g g u g 1 Σ + (2), 1 Σ − , 1 Π , 1 Π , 1 Δ , 3 Σ + (2), 3 Σ − , 3 Π , 3 Π , 3 Δ , g u g g u u g u u g 5 Σ + (2), 5 Σ − , 5 Π , 5 Π , 5 Δ g u g g u 1 Σ + (2), 1 Σ − , 1 Π , 1 Π , 1 Δ , 3 Σ + (2), 3 Σ − , 3 Π , 3 Π , 3 Δ g u g g u u g g u g 5 Σ + (2), 5 Σ − , 5 Π , 5 Π , 5 Δ , 7 Σ + (2), 7 Σ − , 7 Π , 7 Π , 7 Δ g u g g u g g u u g 1 Σ + (3), 1 Σ − (2), 1 Π (2), 1 Π (2), 1 Δ (2), 1 Δ , 1 Φ , 1 Φ , 1 Γ g u g u g u g g u 1 Σ + (3), 1 Σ − (2), 1 Π (2), 1 Π (2), 1 Δ (2), 1 Δ , 1 Φ , 1 Φ , 1 Γ , g u g u g u g g u 3 Σ + (3), 3 Σ − (2), 3 Π (2), 3 Π (2), 3 Δ , 3 Δ (2), 3 Φ , 3 Φ , 3 Γ g u g u g u u u g 1 Σ + (3), 1 Σ − (2), 1 Π (2), 1 Π (2), 1 Δ (2), 1 Δ , 1 Φ , 1 Φ , 1 Γ , g u g u g u g g u 3 Σ + (3), 3 Σ − (2), 3 Π (2), 3 Π (2), 3 Δ , 3 Δ (2), 3 Φ , 3 Φ , 3 Γ , g u g u g u u u g 5 Σ + (3), 5 Σ − (2), 5 Π (2), 5 Π (2), 5 Δ (2), 5 Δ , 5 Φ , 5 Φ , 5 Γ g u g u g u g g u 2S 3S 4S 1P 2P 3P 4P 1D 2D 3D includes the exchange interaction in atoms.
In particular, the exchange interaction potential of two hydrogen atoms is (R) ∼ exp(−2R/a0 ) at large distances between them. The exchange interaction potential may have a different sign that determines the possibility of formation of a chemical bond for a given electron term at the approach of atomic particles. If this sign is negative, a covalence chemical bond is formed at moderate distances between atomic particles and the number of attractive and repulsed electron terms is approximately equal.
3h¯ e2 λ Here λ is the transition wavelength; other notations are the same as above. 7. The rate of the radiative transition is [34, 35, 39] 1 4ω3 2 = B∗o = d go . τ∗o 3h¯ c3 Here B is the Einstein coefficient; other notations are as above. 8. The rate of radiative transition is given by 1 32π 3 2 = B∗o = d go . 14. 4 73 24 140 24 360 70 24 140 70 240 Here λ is the wavelength of this transition; other notations are the same as above. 9. The rate of radiative transition is 1 2ω2 e2 go = fo∗. τ∗o me c3 g∗ 10.