class6_w08

class6_w08 - THE BASIS FOR THE GREENHOUSE EFFECT LIES IN...

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Possible different quantized electron transitions are shown by vertical arrows Within each electronic state, there are closely spaced vibrational states with energy differences in the infrared range Within each vibrational state there are closely spaced rotational states with energy differences in the microwave range THE BASIS FOR THE GREENHOUSE EFFECT LIES IN INFRARED SPECTROSCOPY
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Vibrational spectroscopy Bonds can be thought of as springs connected to two masses The stiffness of the spring is the force constant of the bond The lowest energy position is the equilibrium bond distance; moving the atoms closer together or farther apart increases the energy. O 2 , N 2 and Ar are unable to absorb IR light : argon is monatomic and has no bond stretching or angle stretching frequencies absorption requires a change in dipole moment (O 2 , N 2 lack a dipole) Heteronuclear diatomic gases (CO, NO) have a dipole, but are present at too-low concentration to influence greenhouse heating
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class6_w08 - THE BASIS FOR THE GREENHOUSE EFFECT LIES IN...

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