Energetic Charged-Particle Interactions with Atmospheres and by Robert E. Johnson
By Robert E. Johnson
On attending a convention at the Jovian satellites at UCLA, I heard Lou Lanze rotti vigorously current the fascinating facts at the sputtering of water ice via Me V protons fascinated about W. L. Brown at AT&T Bell Labs. In his inimitable means he made transparent that this new digital sputtering method was once very poorly below stood and was once extremely important for floor homes of sattelites. i used to be immedia tely hooked, and feature been operating ever given that with Lanzerotti, Brown, my col league at Virginia, John dull, and Bo Sundqvist at Uppsala on knowing the ejection of fabric from surfaces and utilizing laboratory effects to intere sting planetary difficulties. during scripting this booklet I additionally had the advantage of spending a semester with the Planetary Geosciences staff in Hawaii, due to Tom McCord, a time period with Doug Nash at JPL, and a interval ot time with the crowd at Catania. The e-book used to be all started with the encouragement of Lou Lanzerotti. The writing has long past slowly because the box has been altering speedily. Even now i believe it really is incom plete, because the attention-grabbing Halley dirt information have only recently been interpreted intimately, Voyager has lately visited Neptune, and the knowledge on Pluto are swiftly bettering. notwithstanding, lots of the ideas for plasma ion alteration of surfaces and gases were confirmed permitting, i'm hoping, a coherent and precious body paintings for incorporating either new laboratory and planetary data.
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Extra resources for Energetic Charged-Particle Interactions with Atmospheres and Surfaces
However, the Pauli principle must be applied, and each of the constituents moves relative to the center of mass of its parent atom or molecule. As this motion is superimposed on the overall collisional motion, the description of a collision can be complex even for the simplest atoms. Rather than solve the complete many-body system, the interaction potential between the atomic centers is averaged over the motion of the electrons. This separation of the motion of the electrons and nuclei. based on their huge differences in mass, is referred to as the Born-Oppenheimer separation (Torrens 1972; Johnson 1982).
A width to the state. Therefore, the maximum in the cross section occurs when L\E equals the excitation energy hw. This is referred to as the Massey criterion. Many of the approximations used to describe such transitions incorporate only the initial and final states. , curve crossing transitions); and weak interactions, Collision Physics 50 for which the initial charge distribution can be considered static. This parallels the division used above to calculate the interaction potentials. The first case applies to velocities comparable to or smaller than the speeds of the constituent particles of the target and is generally associated with the intermediate range interactions.
_.... 1020L-~~----~-~----~-~ 10 2 103 104 EA 8A (keV - de g) Fig. 6. Angular differential cross section experiment for He+ +Ar and Ne+ +Ar at three values of EA, 25keV, - - - 50keV, ---100 keY. Approximate power laws indicated by n. (Fuls et al. 1957) where an is given in Appendix 2B. This shows explicitly that the deflection is determined primarily by the nature of the potential near the distance of closest approach of the colliding particles. Therefore, it is not necessary to know the potential accurately at all R in order to obtain an estimate of the deflection function as long as V/E« 1.