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This lab involves recording the fundamental vibration-rotation spectrum for HCl and DCl on an FTIR spectrometer. The spectra contain an enormous quantity of information and may be analyzed to yield accurate values of the mean bond lengths for HCl and DCl and values for the H-Cl chemical bond stretching force constant. Evidence for the existence of two isotopes of Cl, for rotational energy level degeneracy, and for vibrational anharmonicity is contained in each spectrum. For most students this is the vibration-rotation experiment of choice. For those students who would like to work with a trickier spectrum and the Lambda-9 spectrometer, the acetylene spectrum of lab 2b is suggested. In both experiments, sufficient experimental data are obtained to allow meaningful error analyses.
You can click here for a pdf version of the lab handout (about 69k in size).
You can click here (or on the icon to the right) for an interactive
page that covers the fundamentals of vibration-rotation spectroscopy:
phenomenology, terminology, energy levels, appearance of the spectra,
etc. This page is a Text Extra as well.
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