Advances In Atomic, Molecular, and Optical Physics, Vol. 30 by David Bates (ed.), Benjamin Bederson (ed.)

By David Bates (ed.), Benjamin Bederson (ed.)

This sequence, validated in 1965, addresses contemporary advancements within the common zone of atomic, molecular, and optical physics. the sphere is in a country of swift development, as new experimental and theoretical thoughts are delivered to endure on many elderly and new difficulties. Such difficulties variety from reviews of the basic houses of radiation and subject, via reports of hitherto inaccesible states of "ordinary" and unique atoms and molecules, the keep an eye on of atoms and molecules by means of mild, the behaviour of atoms and molecules in extreme radiation fields, the exact constitution of such platforms, together with advanced molecules and molecular clusters, and a variety of interplay phenomena between atoms, molecules, and their constituent components and fields. issues coated additionally contain comparable utilized components, corresponding to atmospheric technological know-how, astrophysics, floor physics, and laser physics.

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First we compare the elaborate calculations of close-coupling type. Figures l(a)-8(a) show a comparison between the five-state close-coupling (CC5) calculation of Bhadra et al. (1979) and the five-state R-matrix (RM5) calculation by Fon er al. (1979, 1980). The relative angular dependences of the DCS obtained by those two calculations agree well with each other. The absolute magnitudes of the DCS, however, disagree. The largest discrepancy (by a factor of three) occurs for the 1's + 2's transition at 100 eV.

Rev. A 41,5916. Weigold, A. , and Brunger. M. J . , McCarthy, 1. , Teubner, P. J. 0.. Allen, L. 1. (1990). J. Phvs. B : A t . Mol. Opt. Phys. 23, 1325. Burke, P. , and Robb, W. D. (1975). Adv. AtomicMolec. Phys. 11, 143. Burke, P. G.. Hibbert. , and Robb, W. D. (1971). J. Phvs. B : A r . Mol. Phvs. 4, 153. Burke. P. G.. Noble, C. , and Scott, M. P. (1987). Proc. R . SOC. A 410,289. Byron. F. , and Joachain, C. J. (1975). J. Phvs. B: At. Mol. Phvs. 8, L284. Byron, F. , and Joachain, C. J. (1977).

The absolute magnitude, however, differs by as much as 40%. This is the same result which Joachain and Van Den Eynde (1970) investigated for the 1 'S + 23S transition at 225 and 500 eV using the Born Oppenheimer approximation. 6 eV. DIFFERENTIAL CROSS SECTIONS FOR EXCITATION OF HELIUM ATOMS 31 D. DIFFERENTIAL CROSSSECTION FOR THE 1 'S + 2's TRANSITION IN THE FORWARD DIRECTION Recently Sakai era/. (1991) measured the DCS for the 1 'S + 2's transition with a high angular resolution of about 1". Their measurement was done at the incident energies of 200 and 500 eV for the angle from 0" to 12".

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