Answer:
a. Missing line in the middle is shows the difference in rotational inertia of two chlorine isotopes.
b . The bond force constant can be calculated by involving the vibrational transition in spectrum of HCl from the ground state to the first excited state as quantum harmonic oscillator.
Since transition frequency does not involved in the observed spectrum, as there is no transitions between j = 0, v = 0 to j = 0, v = 1, rotational quantum number must has to change by one.
Take approximately the mid-value of j = 1, v = 0 > j = 0, v = 1 and the j = 0,v = 0 > j = 1,v = 1 transitions. This provides information that difference between j = 0 and j = 1 levels is same for the ground state as well as first excited state, which gives that the first excited vibrational state does not stretch the bond.
IR absorption soectrum of gasphase hcl question The infrared absorption spectrum of gas-phase HCl can be...
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