Predavanje 1 - phy
Predavanje 1 - phy
Predavanje 1 - phy
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Vibracije molekula<br />
- r0 ravnotežna udaljenost dva atoma<br />
- r < r 0 atomi se odbijaju, r > r 0 atomi se privlače<br />
- Van der Waalsova interakcija<br />
- potencijalna energija:<br />
⎡⎛<br />
R<br />
U = U 0<br />
0 ⎢<br />
⎝<br />
⎜<br />
⎣ r<br />
12<br />
⎞<br />
⎠<br />
⎟<br />
⎛<br />
− 2 R 0<br />
⎝<br />
⎜<br />
r<br />
6<br />
⎞<br />
⎠<br />
⎟<br />
⎤<br />
⎥<br />
⎦<br />
F r<br />
= − dU<br />
dr = U 0<br />
⎡<br />
⎢<br />
⎣<br />
12R 0<br />
12<br />
6<br />
− 2 6R 0<br />
r 13 r 7<br />
⎤<br />
⎥<br />
⎦<br />
= 12U ⎡<br />
0 ⎛ R 0<br />
⎢<br />
R 0<br />
⎝<br />
⎜<br />
⎣ r<br />
13<br />
⎞<br />
⎠<br />
⎟<br />
⎛<br />
− R 0<br />
⎝<br />
⎜<br />
r<br />
7<br />
⎞<br />
⎠<br />
⎟<br />
⎤<br />
⎥<br />
⎦<br />
r < R 0<br />
⇒ F > 0<br />
r > R 0<br />
⇒ F < 0<br />
Monday, March 14, 2011