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Tellurite And Fluorotellurite Glasses For Active And Passive

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6. Optical properties; MDO 174<br />

Fig. (6.2): Harmonic oscillation of two nuclei [2].<br />

where q is the distance the ‘spring’ has stretched from its equilibrium position, re, and k is<br />

the force constant, measured in N.m -1 . The potential energy of the bond, Ep, is given by<br />

equation (6.13) [2].<br />

dE p<br />

= −Fdq<br />

= kqdq<br />

1<br />

kq<br />

2<br />

2<br />

∴ E p =<br />

(6.13)<br />

Fig. (6.3) shows the variation in potential energy with distance between two nuclei, using<br />

the harmonic oscillator model [2].<br />

re<br />

re<br />

r<br />

q

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