Match the description of a process with the corresponding arrow in Figure 8.30:
(a) Absorption of a photon whose energy is E1 − E0
(b) Absorption from an excited state (a rare event at low temperatures)
(c) Emission of a photon whose energy is E3 − E1
(d) Emission of a photon whose energy is E2 − E0
(e) In drawing arrows to represent energy transitions, which of the following statements are correct?
(1) It doesn't matter in which direction you draw the arrow as long as it connects the initial and final states.
(2) For emission, the arrow points down.
(3) For absorption, the arrow points up.
(4) The tail of the arrow is drawn on the initial state.
(5) The head of the arrow is drawn on the final state