

In
this next experiment you will investigate the influence of isotopic
substitution on the rotational Raman spectrum.
Launch Applet 5.
Q7.1 Deuterium is twice a massive as hydrogen. How would you expect
this to affect the spectra?
Q7.2 Use the applet to calculate the bond length of molecular hydrogen.
Q7.3 Assuming that the HH and DD bond lengths are equal, derive
a relationship between the positions of corresponding lines in the
spectra of hydrogen and deuterium.
Q7.4 Use the applet to test the validity of this assumption. Try and
give explanation for this finding.
Q7.5 Calculate the bond length for deuterium.
_H
has I = ½ so has identical nuclear spin statistics to the hypothetical
molecule .
