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Untitled - Sciencemadness Dot Org

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4.2 Density.<br />

Crystal Density7<br />

Crystal<br />

Method of Temperature Crystal Density<br />

Determination (“C) Form (g/cm”)<br />

X-ray calculation 22 I 1.778<br />

X-ray calculation 136 II 1.716<br />

Experimental 22 I 1.778<br />

Compression gives the following densities.’<br />

4.3 Infrared Spectrum. See Fig. 1.<br />

25<br />

Pressure Density<br />

(psi) k/cm3)<br />

5 000 1.58<br />

10 000 1.64<br />

20 000 1.71<br />

30 000 1.73<br />

40 000 1.74<br />

WAVELENGTH (pm)<br />

6 * 14<br />

WAVE NUMBER (I/cm I<br />

PETN<br />

Fig. 1. Infrared spectrum.<br />

133

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