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Why do we get hot while lying in the sun

We have already seen how, on the microscopic level, the vibrational energies of bonds are quantized in a similar manner to the way the energies required for electronic excitation are quantized. For this reason, irradiation with an infrared light from the sun or a lamp results in a photon absorption, and the bonds vibrate, which we experience as the sensation of heat. [Pg.464]

Mathematically, the movement of vibrating atoms at either end of a bond can be approximated to simple-harmonic motion (SHM), like two balls separated by a spring. From classical mechanics, the force necessary to shift an atom or group away from its equilibrium position is given by [Pg.464]

Equation (9.19) is a chemical version of Hooke s law, and only applies where the Morse curve is parabolic, i.e. near the bottom of the curve where molecular vibrations are of low energy. [Pg.464]

Photons of infrared light are not sufficiently energetic to excite electrons, but can excite between quantum-mechanical vibrational levels. [Pg.464]

Molecules translate, rotate and vibrate at any temperature (except absolute zero), jumping between the requisite quantum-mechanically allowed energy levels. We call the common pool of energy enabling translation, rotation and vibration the thermal energy . In fact, we can now rephrase the statement on p. 34, and say that temperature is a macroscopic manifestation of these motions. Energy can be readily distributed and redistributed at random between these different modes. [Pg.465]


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