However , at energies too low to excite water vapor , the atmosphere becomes transparent again , allowing free transmission of most microwave and radio waves .
Absorption bands in the infrared are due to modes of vibrational excitation in water vapor .
At energies too low to excite water vapor , the atmosphere becomes transparent again , allowing free transmission of most microwave and radio waves .
Absorption bands in the infrared are due to modes of vibrational excitation in water vapor .