In Laser Opto-acoustic spectroscopy, the IR beam excites the molecules to higher states. In which of the following ways do the molecules return to the ground state?
A. Collisional de-excitation
B. Random de-excitation
C. By spontaneous emission
D. By stimulated emission
Answer:A
In Laser Opto-acoustic spectroscopy, the IR beam excites the molecules to higher states. In which of the following ways do the molecules return to the ground state?
A. Collisional de-excitation B. Random de-excitation C. By spontaneous emission D. By stimulated emission
Explanation: The molecules return to the ground state by collisional de-excitation. This results in increase in temperature.