Download 45.Plasma Science by John G. Webster (Editor) PDF

By John G. Webster (Editor)

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We will first discuss the basic definition of field ionization. Electric fields allow the valence electron of an J. ), Wiley Encyclopedia of Electrical and Electronics Engineering. Copyright # 1999 John Wiley & Sons, Inc. FIELD IONIZATION atom to ionize by tunneling through the combined electric and Coulomb potential. Hence in external electric fields all bound states become quasibound due to tunneling. Then we will discuss tunneling through a potential barrier in general, followed by a basic discussion of the Stark effect.

Copyright # 1999 John Wiley & Sons, Inc. FIELD IONIZATION atom to ionize by tunneling through the combined electric and Coulomb potential. Hence in external electric fields all bound states become quasibound due to tunneling. Then we will discuss tunneling through a potential barrier in general, followed by a basic discussion of the Stark effect. Because not only static external electric fields, which give rise to the celebrated Stark effect, are of principal interest, we will also discuss the behavior of a Rydberg electron under subpicosecond electric pulses.

R → r exp(i ) (12) As shown by Seipp, Taylor, and Schweizer (12) tunneling below the classical ionization limit Esp is relatively weak and even above Esp some resonances exist with negligible small widths. Qualitative differences occur for hydrogen and alkalimetal atoms due to the separability of hydrogen in electric fields. The spectra for alkali-metal atoms are much more disordered and no closely bound resonances above the classical ionization limit occur. If we turn on a magnetic field parallel to the electric field all resonances get shifted in the direction of positive energy, as is expected from the positive quadratic Zeeman effect.

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