Question

Optical pumping means transferring electrons:

• A. from ground state to metastable state
• B. from metastable state to a higher excited state
• C. from a state higher than the metastable state to the metastable state
• D. from a state lower than the metastable state to a state higher than the metastable state

Answer 1

Answer: (D)

from a state lower than the metastable state to a state higher than the metastable state

Optical pumping is a process in which light is used to raise (or "pump") electrons from a lower energy level in an atom or molecule to a higher one.