Stark contrasts

Stark Effect

An electric field partly lifts the degeneracies of atomic energy levels. This splitting was observed by Stark [1] and explained by Schrödinger [2]. We compute the Stark effect on atomic hydrogen using perturbation theory by diagonalizing the perturbation term in the N-fold degenerate multiplet of states with principal quantum number N . We exploit the symmetries of this problem to simplify the ...

The Stark truth about the Stark law. Part I.

challenges to physicians – those with specific business interests as well as those whose sole focus is patient care. Understanding the law and knowing which, if any, of the many Stark exceptions apply to your arrangement is essential. Part I of this series explained the purpose of the Stark statute, how it differs from the anti-kickback statute and how you can determine whether it applies to ...

Simple Effects, Simple Contrasts, and Main Effect Contrasts

Simple Effects Following a significant interaction, follow-up tests are usually needed to explore the exact nature of the interaction. Simple effects (sometimes called simple main effects) are differences among particular cell means within the design. More precisely, a simple effect is the effect of one independent variable within one level of a second independent variable. In our hypothetical ...

Active Stark Atomic Spectroscopy

Active Stark Atomic Spectroscopy (ASAS) method can be used to determine the electric field in the diode of an ion or electron accelerator as a function of position and time, including the positions of anode and cathode plasma emission surfaces (in order to obtain the effective accelerating gap). As possible probe beams, we suggest the use of lithium and sodium atoms. The diagnostic provides a m...

Stark ’ s Conjectures