Excite Atom button should send a random photon that is absorbable when the atom is in state (2,0,0).

[DianaTavares]

Excite Atom appears when stuck in the metastable 2S state. (Excite to n >2 in Schrödinger, will sometimes decay down to 2S state.)

We decided in today's design meeting that:

• Excite Atom button should send a random visible photon (of the 4 possible transitions)
• n=2 → n >2 buttons in dialog should always be enabled, even if they are unlikely to do anything most of the time

[pixelzoom]

Also...

• The "Excite Atom" button should be visible only when the atom is in the metastable state (n, l, m ) = (2, 0, 0).

[pixelzoom]

Looking at the Java version... It always emits 656 nm (red). But it then selects one of the 4 transitions from n = 2. So that's incorrect and potentially confusing. In the HTML5 version, I'll make sure that the corresponding transition is used for the wavelength that is randomly selected.

[pixelzoom]

This has been implemented, but it's difficult to review, since the Schrodinger view has not been implemented yet. So I'll leave this issue open and circle back later.