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Physical Chemistry 3: — Chemical Kinetics — - Christian-Albrechts ...

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Appendix G 306<br />

G.9 Zustandssumme für die Rotationsbewegung<br />

I<br />

lineare Moleküle:<br />

= ~2<br />

( +1) =0 1 2 (G.92)<br />

2<br />

~ 2<br />

2 = <br />

(G.93)<br />

I<br />

Rotationszustandssumme:<br />

(2) = 1 <br />

= 1 <br />

= 1 <br />

∞X<br />

− <br />

(G.94)<br />

=0<br />

∞X<br />

(2 +1) −~2 (+1)2<br />

=0<br />

Z ∞<br />

(G.95)<br />

(2 +1) −~2 (+1)2 (G.96)<br />

=0<br />

y<br />

(2) = 2<br />

~ 2 = <br />

<br />

(G.97)<br />

I<br />

Symmetriezahl:<br />

<br />

(G.98)<br />

I Rotationszustandssumme für nichtlineare Moleküle: ist nur für symmetrische<br />

Kreisel analytisch darstellbar, nicht für asymmetrische Kreisel. Für nicht zu tiefe Temperaturen<br />

ist<br />

(3) = 12<br />

<br />

µ 2<br />

~ 2 32<br />

( ) 12 = 12<br />

()32 () −12 (G.99)<br />

I<br />

typische Werte bei Zimmertemperatur:<br />

≈ 100 1000<br />

(G.100)

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